Best portable high-capacity power banks, including 50,000mAh chargers 2023. Maxoak power bank 50000

Best portable high-capacity power banks, including 50,000mAh chargers 2023

These chargers offer the capacity and power output to handle all your device needs.

RAVPower 90W Power Delivery Portable Charger Charging Chromebook (Image credit: Ara Wagoner / Android Central)

Today’s phones and tablets are more powerful than ever, but despite more power-efficient processors, it’s not uncommon to find yourself needing to charge up at times when you aren’t near a wall outlet with a portable charger or power bank. A high-capacity battery pack that is 20,000mAh and higher is ideal for people who need a lot of juice while on the go, and while they may not fit into your. they’re necessary for keeping your devices topped off. Our top pick is the RAVPower 90W Power Delivery Portable Charger. Here’s why it’s the best high-capacity power bank, along with other great alternatives if you need something even bigger.

Reasons to avoid

Anker is one of the biggest names among power banks and chargers today. It’s built that name thanks to exemplary build quality and long-term durability and recently announced new technology to further improve on the best Anker power banks on the market. The Anker 737 Power Bank is a major upgrade from previous generations with 24,000mAh in a very compact package. But don’t mistake its small size for small power. It can pump out up to 140W of juice and recharge at the same rate. This means that this power bank can charge phones, tablets, and power-hungry laptops with no trouble.

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24,000mAh is on the lower end of the high capacity spectrum, but it can still recharge a smartphone four to six times on a single charge or recharge most USB-C laptops from empty to full at least once. If you are using more than one port, it is worth keeping in mind that the USB-A port is capped at 18W regardless of what the USB-C port is doing. But those high-powered USB-C ports will still kick out up to 122W when using both simultaneously.

This beefy bundle isn’t lightweight, but nothing over 20,000mAh is. The Anker 737 Power Bank is compact enough to easily slip in and out of a backpack while rushing around an airport or convention. While it doesn’t come with a USB-C charger, it does include a high-quality USB-C to USB-C cable capable of handling the high wattage. You also get a helpful display showing battery percentage, what the output or input rate is and how long until the battery is drained or full.

Reasons to avoid

When it comes to charging multiple devices quickly with a power bank, you don’t need tons of ports, just a few ports that all charge at decent speeds. If you need a big, beefy battery that you can still fly with, the Sherpa 100PD is just under the FAA’s 100Whr limit, and it’s just what you need to keep a laptop or camera topped off while working on the road.

The main port here is a 60W USB-C Power Delivery Port, which will give your laptop a quick recharge and recharge faster once you reach your destination and plug it back in. You also get two USB-A ports for smaller peripherals and a Qi wireless charging pad on the top of the bank.

Goal Zero is a brand you might not have heard of before since it tends to deal with solar and portable power solutions. However, because it’s geared towards outdoor tech, you can rest assured this is a battery pack that will not leave you hanging. The Sherpa 100 PD is about half the size (and half the price) of the Sherpa 100 AC, so make sure you grab the newer PD model!

Reasons to avoid

Let’s say that you want an overwhelmingly huge battery pack with no concern about its price or size. If that’s the situation you’re in, the MAXOAK Power Bank 50000 hits all the right notes.

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The 50,000mAh capacity here is enormous, and while you may not think you need that much battery, it comes in handy for long road trips, hurricane season, and other situations in which you’re without access to power for a prolonged period of time. With such a big battery, you could charge an iPhone X up to 16 times.

For phones, tablets, and other mobile gadgets, you have two USB-A ports at 2.1A and two USB-A ports at 1A. MAXOAK’s battery pack is also a great choice for laptops, as there are 20V and 12V DC outputs.

MAXOAK’s pack won’t be going in your anytime soon, but you can easily toss it in a backpack and have hours upon hours of charge time to take with you anywhere.

Reasons to avoid

Our editor Harish Jonnalagadda tests a lot of power banks, and two of his recent favorites are the Shargeek Storm 2 and Storm 2 Slim. He called the latter his new favorite because of its portability and 130W charging speed, but even though it could just make our list at 20,000 mAh, we’re more focused on high-capacity power banks here, so we’ll go with the standard Storm 2 for this list.

The Storm 2 has four ports, including a DC outlet with a variable voltage you can control via the built-in screen, which also shows ports in use, battery charge level, and thermals. As Harish noted, 25600mAh is just under the 27,000 maximum allowed on carry-on luggage, and the Storm 2’s 579g weight gives a pretty solid size-to-capacity ratio.

You can use up to three of the four ports at once; below is the breakdown of how much power you get per charge:

  • USB-C1 USB-C2: 65W 30W
  • USB-C1 USB-A: 65W 18W
  • USB-C2 USB-A: 30W Max
  • DC USB-C2: 65W 30W
  • DC USB-A: 65W 18W
  • USB-C1 USB-C2 USB-A: 65W 25W
  • DC USB-C2 USB-A: 65W 25W

Perhaps the coolest thing about the Shargeek Storm 2, aside from its powerful wattage, is its transparent and distinct look, something techies will find pretty distinct from power banks’ usual look.

Reasons to avoid

If you’ve played in the rugged power space for any amount of time, you’re bound to be familiar with Jackery and its eponymous Explorer Series. These power stations come in sizes ranging from 160Whr all the way up to 100Whr, but after reviewing the Explorer 300, we think it hits the sweet spot in Jackery’s current lineup for three reasons:

  • The Explorer 300 has a USB-C Power Delivery port, while the 500 and 240 do not.
  • You get both AC wall plugs and a car outlet, which many camping appliances runoff.
  • 300Whr is a good capacity without getting super expensive or too heavy.

Unlike the RAVPower, Jackery goes for the traditional toolbox style where all the ports go on the front, and all the power cells sit in the bottom and back with a box, honking handle up top that’s easy to grab and easy to carry from a car to campsite and back again. There are two AC plugs here that can be used to charge electronics and run smaller appliances like a camp fridge or a TV, but it’s not rated for higher-wattage electronics like the Explorer 500 and 1000. When used with lower-wattage devices, it also has an automatic shutoff, meaning you can’t trust it to stay on all night with a CPAP machine.

Like Goal Zero, Jackery makes solar panels perfect for recharging this power station when you’re out in the woods for that three-week sabbatical, but also, like Goal Zero, those solar panels will come at a steep premium. If you need to recharge the Explorer 300 in a hurry, though, you can combine the 60W Power Delivery charging with the included 90W wall charger to recharge to 80% in two hours.

Like Goal Zero, Jackery makes solar panels perfect for recharging this power station when you’re out in the woods for that three-week sabbatical, but also, like Goal Zero, those solar panels will come at a steep premium. If you need to recharge the Explorer 300 in a hurry, though, you can combine the 60W Power Delivery charging with the included 90W wall charger to recharge to 80% in two hours.

Reasons to avoid

There are battery packs in a league of their own, and there’s the Fanttik Evo 300. Not everyone needs to spend this much money on a battery pack, but if you want one of the most powerful options out there and have the money to afford it, this is it, chief.

The Fanttik Evo 300 is less of a battery pack and more of a lunch box-sized emergency power station. You get plenty of ports and surge output up to 600W, which powers more substantial things through the AC outlet and car socket for a day or two.

Going back to the port selection, you have a lot to choose from, including:

  • 12V DC car socket
  • Two 110V AC output
  • Two USB-A 3A ports
  • Two USB-C ports, one rated at 60W PD
  • DC input combines with USB-C for faster recharging

While it is on the expensive side and a bit cumbersome, the after reviewing the Fanttik Evo 300, it became clear it’s one of the best options for having a reliable power source during power outages, emergencies, and long camping treks. As an added point of comfort, the power station has a large LED room light to ensure you are never left in the dark, checking all of the boxes for why everyone should own a portable power station.

Reasons to avoid

One of the best use cases for a power bank is using it as a power source while camping, hiking, or on other outdoor adventures. If this is the primary scenario in which you’ll be using your new power bank, we recommend checking out the BLAVOR Solar Charger Power Bank.

For people who spend a lot of time outdoors, one of the best features of this battery pack is solar panels on the top that allow it to recharge using the sun. Solar recharging isn’t the fastest, but it is nice to have. If you need to recharge the BLAVOR more quickly, you do so via USB-C or Micro-USB. This bank has a single USB-C 18W Power Delivery port, two USB-A ports (one 9V/2A, one Qualcomm QuickCharge 18W), and there’s even a 10W Qi wireless charging pad so that you can charge four devices at once.

An IPX5 rating offers ample protection against splashing water, there’s a built-in LED flashlight to help you see at night, and the 20,000mAh capacity should be plenty of battery for most weekend adventures.

Balancing size and sensibility: What makes the best high-capacity power banks

You’ll be happy no matter which battery packs on this list you choose, but at the end of the day, if you want a portable power bank that offers high-power output and isn’t going to be a beast to carry around, the Anker 737 Power Bank is the way to go. It allows you to charge three devices at once, it comes with a high-quality cable and has a helpful display to see the battery status. While this power bank isn’t going to come cheap, it offers impressive capabilities that will likely handle your mobile power for years to come.

We think the best value pick is the RAVPower 90W Power Delivery Portable Charger with its 30,000mAh capacity. It’s the most affordable entry on this list, and yet it also hosts one of the highest charging speeds and will still fit easily in your backpack or suitcase (so long as you aren’t getting on a plane). Yes, it only has two ports, but unless you consistently need to charge 3-4 devices at once, why pay for ports you on’t need?

How to choose the best high-capacity battery pack

While battery packs are seemingly simple gadgets, there are quite a few different things you should consider before buying one.

Sure, you could go out and buy the biggest one you see, but if you take the time to understand the little differences between everything, you’ll end up with a battery pack that truly fits your needs and works the best for your specific workflow/lifestyle. Once you have determined what you’ll be using the mobile power solution for, you can decide if a high-capacity power bank is for you or if you should go with one of the best portable power stations.

How much battery capacity do you actually need?

Perhaps the most important thing to consider before buying a battery pack is its capacity — in other words, how big of a battery it’s packing.

Since we’re dealing with high-capacity packs, we’re only looking at 20,000mAh or higher options. As such, any of the picks on this list will be able to charge your smartphone multiple times and still have some leftover fuel in the tank.

For comparison’s sake, most smartphones today have batteries that vary in capacity from around 3,500 and 4,500mAh. If you’re planning on using your battery pack to charge your phone, tablet, or headphones, something with a capacity of around 10,000-15,000mAh should be enough so long as you’re getting home to an outlet by the end of the day. If this sounds like a better fit for you, you might want to consider a more compact power bank.

So, why do power banks with capacities of 30,000mAh and more exist? There are a couple of good reasons:

  • For people that want to charge a larger device, such as a laptop, having a big capacity will ensure you have access to enough power.
  • For backpacking or other outdoor adventures where outlets are few and far between, a high-capacity bank ensures you can keep your phone charged and your lifeline alive, as well as power small camping appliances.
  • If you live somewhere prone to severe weather like hurricanes or tornadoes, a power station-style high-capacity portable charger like the Anker 757 PowerHouse will ensure you can stay connected while waiting for the electrical grid to be repaired. That also applies to whether you experience a serious personal emergency like a house fire.

Why USB-C is so important

We’ve talked a lot about USB-C Power Delivery throughout this article, but let’s take a step back for a second and explain why it’s so important and why you should get a USB-C battery pack.

USB-C is essentially the better-in-every-way evolution from those Micro-USB ports that used to be prevalent on just about every Android phone for charging. Not only does USB-C benefit from the fact that it’s reversible (meaning there’s no wrong way to insert it), but it’s also considerably more powerful: Power Delivery can be used to charge at speeds up to 100W or beyond, such as the 140W speeds on our overall pick, the Anker 737 Power Bank.

Here’s the thing, though — not all USB-C ports are created equally. Most USB-C ports come with the Power Delivery standard (often referred to as PD), which signifies that a USB-C port offers considerably faster charging and data speeds. So if a USB-C port only offers 15W, that’s a USB-C port that is not USB-C, and you should skip it.

As such, when you’re looking to charge a device that has an extraordinarily big battery, not just USB-C but also Power Delivery is a must. Not only are a lot of newer devices moving to Power Delivery ports, but it’ll also cut down quite a bit on recharge times.

Hands on: MaxOak K2 Portable Charger 50,000mAh review

The MaxOak K2 is an impressive piece of kit that’s worth every penny for the target audience. Its 50Ah capacity will ensure that business laptops can run for days without needing to charge at a plug socket.


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The MaxOak K2 is named after the world’s second highest mountain, and it’s a fitting moniker that manufacturer KayoMaxtar chose. After all, at 50,000mAh, this is one of the biggest portable laptop battery chargers available, with a literally mountainous capacity.

Just to put that in perspective, the Samsung Galaxy S8 Plus has a 3,500mAh battery, meaning that the MaxOak K2 could potentially charge it more than 14 times over with some juice spare. And the popular Dell XPS 13 laptop could get a whole day’s worth of charge out of this accessory.

As expected, the K2 is built like a brick, measuring 207 x 136 x 33mm, and at nearly 1.28kg, isn’t far off the weight of a brick – it’s certainly heavier than most new ultraportable laptops (like the Toshiba X20W-D).

KayoMaxtar opted for a metal finish which gives a nice premium feel to the device, but it’s slippery on some surfaces, so gets some self-adhesive plastic feet. All connectors, status lights and the power button are located on one side.

There’s one power-in socket, four white LED lights that give a rough idea of how much juice the battery currently holds, an oversized power button, a 12V@2.5A output, another 20V@3A output, and four full-size USB ports (two at 2.1A and two at 1A).

The latter are arranged in two columns (two per column) and it would have probably been better to have them aligned in the same direction (which would have allowed the engineers to pack in more of them).

So sadly, there’s no USB Type-C connector or any sort of fast charging trickery (e.g Qualcomm Quick Charge) that rivals like the Aukey PB-T11 offer; some smartphones – especially the high-end models – have moved to 9V. However, this accessory does automatically power up when connected with a compatible device.

A word of warning: the 12V and 20V connectors are located near to each other so make sure you double-check before plugging in or you might fry your device. The LED status lights only give a very approximate idea (plus or minus 20%) of the level of charge remaining, so you’re never sure if the battery is completely full (four LEDs) or just about to die (one LED).

Given the size of the device, the K2 can only be charged using a proprietary/dedicated power supply unit rated at 16.8V, 2.5A (42W); there’s no option for charging via a microUSB or USB Type-C port. KayoMaxtar claims that it takes up to eight hours to charge the battery.

Along with the battery itself, you get a protective pouch with a set of laptop adaptors (14 in all), a microUSB cable, and a power cord. The connectors, the manufacturer says, should cover 90% of all laptops on the market, although if you hadn’t noticed, you won’t be able to charge an Apple device or hardware that uses a USB Type-C connector out of the box.

The list of supported laptops includes Sony, Fujitsu, Acer, IBM, Dell, HP, Asus, Compaq, NEC, Toshiba, Lenovo and Samsung.

One of the features that explains the bulky nature of the K2 is the built-in overcurrent and low-current protection that should, in theory, automatically shut down the device should there be an issue with the product.

Note that you may not be able to take this battery on a plane because the massive capacity means it’s banned on most if not all flights. At 185Wh, it is above the 160Wh limitation placed on batteries by the FAA (Federal Aviation Administration) over in the US.

Another limitation is that you won’t be able to power laptops that require more than 60W of load power. That includes mobile workstations or gaming notebooks, but also standard laptops with large displays (think 17-inch models). You can still charge these when they’re turned off, but not when switched on – which is more of a safety net than an intrinsic flaw.

Early verdict

A word about the price first: at the time of writing, this device is only available in the UK from Amazon for a whopping £136, with the item being shipped from China. Cheap this most certainly isn’t.

Whether this portable laptop battery is worth buying will depend on your exact use-case. For business jetsetters, devices like the K2 can be a real boon, but its capacity might be problematic depending on where you are travelling (due to airline restrictions on batteries of this size).

There’s also the fact that it is not officially compatible with Apple devices (and won’t charge Dell XPS 13 touchscreen laptops) and is quite bulky by itself – which means that you will be better off leaving it in your checked-in luggage.

We would have loved an integrated cable, a more precise means of displaying the amount of power left (maybe an LCD), a USB Type-C charging option (both in and out), a quick charging feature and perhaps an emergency light as well.

In the end, this is not a battery charger for those looking to power only smartphones or tablets – there are better models (like the Aukey PB-T11) that can fulfil this role.

Maxoak K2 50,000mAh Laptop Power Bank review

If you need masses of portable power this Maxoak Laptop Power Bank will not disappoint, but does it offer too much power? Our review helps you decide whether this is the power bank for you.

Our Verdict

The Maxoak Laptop Power Bank is the highest-capacity battery we’ve ever tested, and ideal if your power needs are great (and land-based – this is too powerful to take on a plane). With 11 adaptors in the box chances are the Maxoak can charge your laptop along with all your other electronic devices, and still have juice to spare. But while it’s a highly functional power bank with premium looks, there’s really nothing here to justify the expensive price tag. We’d like to see an LCD screen and an AC power outlet for that money, while USB-C and Quick Charge support would not be made to feel unwelcome.

Maxoak’s Laptop Power Bank costs a not insignificant £115.99 from Amazon UK. The device ships from China, which means you’ll be waiting a few weeks for it to arrive, but delivery to the UK is free. Also see: Best power banks 2018.

This is the largest power bank to ever grace the doors of the PC Advisor Test Centre. At a huge 50,000mAh this 1.26kg power bank is about as heavy as the laptop you’ll want to charge with it.

Yep, that’s right: power banks are no longer just for phones, tablets and other USB-connected devices. This Maxoak comes with 11 adaptor tips for plugging in most laptops (various models from Fujitsu, Sony, Acer, Asus, IBM, Dell, HP, NEC, Samsung and Lenovo are listed – check for yours here), though unfortunately there’s no way to charge a laptop that has a different adaptor.

Some of those laptops excluded from the power party are Apple MacBooks and laptops with power adaptors higher than 90W, plus there’s also no native support for USB-C devices. Four full-size USB outputs might enable you to get around the latter problem (though with two rated at only 1A we’d have been equally happy with just the pair of 2.1A outputs). Also see: How to charge your phone’s battery faster.

We appreciate the bundled protective case with zipped side pouch that can be used to prevent the tips getting mislaid, but can’t help feeling an AC power outlet might have been a better approach for covering all laptop bases.

We’ve seen AC power outlets before in, for example, the Omnicharge and RavPower PowerStation Series, though none of these devices has the enormous capacity of the Maxoak Laptop Power Bank.

That really is its key selling point. With 50,000mAh power to hand, you could conceivably keep your laptop powered up for several days.

Your initial reaction to that figure is probably wow, that’s a lot of power. You might well be thinking you could charge your Galaxy S8 almost 17 times, or your iPhone 25 times.

But that’s assuming the device’s entire capacity is available for charging connected devices, which as we know is never the case. Also see: How to improve smartphone battery life.

The industry-standard energy efficiency for power banks sits somewhere between 60- and 70- percent, with some high-end devices with premium batteries able to manage 80- or 90 percent. The Maxoak sits at the lower end of this spectrum, with an efficiency around 60 percent.

This means you’ll get about 30,000mAh for powering your devices, which translates to around 10 full charges for your Galaxy S8 or around 15 for your iPhone, depending on which model you own.

Suddenly this hulking great power bank with its 207x136x33mm case is starting to look on the large side in return for what you get: be under no pretences that this is the type of device you will want to throw in your handbag or rucksack and take out and about with you on your travels.

That said, the Maxoak’s effective capacity mirrors the advertised capacity of the previously highest-capacity power bank we’ve tested. So if you do need a lot of power, this is the way to get it.

But it is not the way to get that power outside the UK, at least not if you’re intending to get there on a plane. Current guidelines allow a maximum 100Wh batteries to be taken onboard flights, which in most cases works out at around 27,000mAh. With its 50,000mAh capacity this power bank has a huge 185Wh rating and is significantly over the allowance. It is not allowed in your hold luggage or your hand luggage. (Also see: What tech can you take on a plane?)

Assuming you’re intending to stay with your feet firmly on the ground, the Maxoak has several attractive features, including passthrough charging (which enables you to charge its battery as it charges your devices) and auto-on – all you need do is plug in a device and charging will begin.

There is a slew of outputs, including 20V/3A and 12V/2.5A outputs for laptops and digital cameras (be careful not to use the wrong one or you could damage your device), and four USB outputs. There’s no Quick Charge support, but two of these USB outputs are reasonably speedy at 2.1A (10.5W). This means that rather than charging one device many times over, you could charge several devices multiple times, keeping them going for a good while away from the mains. Also see: Best MiFi 2017.

Something we might usually find on a power bank is a Micro-USB or USB-C input, which allows you to recharge the bank from your phone- or tablet charger. While it would have been nice to see one here for quick, partial top-ups, the reality is it would take forever for a device of this capacity to charge over USB. Instead you get a wall plug that can take it to 100 percent in between six and eight hours.

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All these connections are found on one end of the device, alongside a rather large power button. Tapping this with no devices connected will activate the four LEDs to let you know how much power remains.

This system is common in power banks, but it’s a major flaw in high-capacity banks such as this: with each LED representing a quarter of that 50,000mAh of power, you’re going to get a very rough reading of how much power is left. With only one LED lit the bank could still contain more power than a fully charged mid-capacity power bank, for example.

LEDs aside, the Maxoak has a nice design, with a gunmetal grey tough outer case and gloss black stripes down either side. The ABS plastic end caps don’t detract from the classy look, and this is a device that would easily fit into any business environment.


Maxoak K2 50,000mAh Laptop Power Bank: Specs

  • 50,000mAh power bank
  • supplied with 11 adaptor tips for popular laptops
  • 1x 20V/3A DC output
  • 1x 12V/2.5A DC output
  • 2x 5V/2.1A USB outputs
  • 2x 5V/1.0A USB outputs
  • 100V-230V AC input
  • four LED battery indicators
  • passthrough charging
  • auto-on
  • protective carry case with zip pouch
  • 207x136x33mm
  • 1.26kg
  • 24-month warranty

Review: MAXOAK 50,000mAh Portable Charger

Any more power bank on the market is going to be able to charge your smartphone, whether you have an Android or iPhone, all power banks are compatible to charge them.

Then after you get past that, there are the rest of the things that a power bank features that you have to look at features such as the power capacity, charging speed, or size of the charger too.

Some power banks are larger than others because they have very large power capacities and they also have many different charging capabilities. Just like this MAXOAK power bank that has a 50,000mAh power capacity and 6 ways to charge your devices.

The power capacity alone is staggering but the 6 charging ways are really what takes the trophy.

Similar Power Banks:

Power Capacity:

The starting power capacity of his MAXOAK charger is 50,000mAh and there’s still a lot of power even when the power capacity goes through a conversion.

Just how much power capacity is lost during charging? Well, the MAXOAK has an average conversion of 70% and that’s going to leave you with 35,000mAh of useable power.

This is mainly because there’s going to be a lot of things charging at once when you use the power, the power banks use Lithium Polymer batteries, and of course, there’s power lost through charging cables. Since you’re going to be charging many devices at once, there’s going to be power lost throughout each charging cable.

How does the MAXOAK 50,000mAh Charge Smartphones

With all that said, we don’t find this to be a hindrance because the power bank still has a lot of power capacity to use. It’s going to burn right through charging smartphones because you’ll be able to charge even larger battery capacity smartphones multiple times over.

Like the iPhone 6 Plus that has a capacity of 2,915mAh which you’ll be able to charge 11 full times and the same goes for a Galaxy S6 that will charge also charge 11 times too.

So if you’re charging solely smartphones with the power bank, it could last on a single charge from anywhere for about a week or even a month if you’re occasionally using it.

DevicesMAXOAK 50,000mAh Portable Charger (Output Capacity = 35,000mAh)Phone CapacityMAXOAK 50,000mAh Portable Charger Left Over Capacity after One Charge

How does the MAXOAK 50,000mAh Charge Tablets

It’s also a good power bank for charging tablets and this time this isn’t just true for charging Mini tablets, but let’s go over those first anyway. If you’re charging smaller tablets like the Samsung Galaxy Tab, then the power bank will be able to charge them about 7 times to full power.

Or if you’re charging an iPad Mini 2 or iPad Mini 4 then they’ll be able to get 5-6 full charges.

Moving onto the larger, more colossal USB charging devices, the Full-Sized iPad 12-inch tablet that has a power capacity of 10,000mAh is going to be able to charge 3 times to its full power capacity.

Considering that it’s a full-sized tablet, the MAXOAK power bank hits it right out of the ballpark with multiple full charges.

Output Charging:

Even though a lot is going on with the charging side, it’s easy to make sense of and this is the second strongest point of the power bank after the power capacity being the first.

Charging with the USB Charging Ports

There are 4 USB charging Ports. Two of the USB ports have a charging speed of 5V/2.1A and the other 2 charging ports have a charging speed of 5V/1.0A.

V/2.1A charging Ports:

Both of these charging ports are the ones that should be your first choice when using any of the 4 charging ports because they offer the faster-charging speed.

They’re able to charge most smartphones at their max charging speed, however, the power bank does not feature Quick Charge and therefore, Quick Charge smartphones will not be able to charge at their max charging speeds.

With that said, both these ports are still powerful and they’re perfect to use with tablets too because they can charge some tablets at their max charging speeds and the charging speed comes close to charging iPads at their max charging speed of 5V/2.4A.

V/1.0A charging Ports:

You should only be using these 2 charging ports if you’re already using the two 2.1A charging ports, this is because both this only offer 1 Amp charging speeds and that’s slow charging for most smartphones and tablets.

Although, overall, you’re able to charge 4 USB charging devices at the same time and that’s amazing.

Charging with the DC Output Ports

There are 2 DC Output charging ports. One provides more power than the other but either way, they’re able to charge compatible laptops or digital cameras. Also, it’s important to know that you can use all 4 of the USB charging ports and 1 DC Output port all the same time.

DC 20V/3A Output:

This DC port can charge most Laptops and if you check out the Amazon page of the MAXOAK power bank, then you can see that it comes with 11 different kinds of connectors for many different Laptops. With that said, the power bank cannot charge MacBooks.

Also, before purchasing, check the charging power that is needed to charge your Laptop which can most likely be found under the Laptop or on the power brick that it uses for charging.

DC 12V/2.5A Output:

The other DC Output port has a slower charging speed and MAXOAK has said that this DC port is most useful for charging Digital cameras. Even though it can be used for that purpose, it can also be used to charge Laptops as well and any other devices that have charging needs that fit its Output.

Input Charging:

It uses a DC Input to recharge itself and for a 50,000mAh power bank, it recharges very quickly because the Home charger that the power bank comes with can recharge the MAXOAK portable charger at 16.8V/2.5A. As a result, the power bank can recharge to full power within 6-8 hours.

Size and Weight:

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It has a length of 8.1 inches, a width of 5.3 inches, and a thickness is 1.3 inches. The weight of the power bank is 2.7 pounds. So for the most part, this going to be set down, and it’s going to be placed into a bag for when you’re taking it places. Luckily it does come with a container/bag to place the power bank in.

Functional Components:

All of the functional parts of the high capacity power bank are on a single side and we mean everything. This includes the 4 USB charging ports, the 2 DC Output ports, the power button, 4 LED power capacity indicators, and the Input port. Charging does not start automatically, so you must press the power button to begin charging.

Structure and Material:

The MAXOAK power bank is very sturdy, it can withstand shortfalls onto carpeted flooring but we don’t think it can withstand high falls onto hard flooring. So it’s perfect to be used every day, to have it with you on travels and so on.


Since you can potentially charge 5 devices at the same time, the MAXOAK power bank has a 6 Tech Safety system that can keep you and your devices safe during charging.

One of the most useful ones is Over-Current protection, which can shut the power bank off automatically if the power bank is Outputting too much power than it can handle. This can prevent damage to the power bank and stop a potential fire.


If you know what you’re getting with the large size and weight, then the MAXOAK power bank is a very reliable portable charger. You can charge 2 smartphones or 2 tablets at the same time or possibly 4 smartphones at the same time if you wanted to, and to put it basically, you can charge a lot of devices on the USB charging end.

Another major reliable factor is that you can charge Laptops as well and that can be useful for when your Laptop is lower on power and you’re nowhere near a Wall Outlet. Of course, there’s the power capacity that can last for days and even weeks depending on how you use the power bank.



It has a very high power capacity that can charge lots of devices many times over and this isn’t just for smartphones, it’s true for Mini tablets as well as Full-Sized tablets and Laptops too.

You can charge 5 devices at the same time with 4 of them being USB charging devices and 1 DC Output device like a Laptop.


It’s a large and heavy power bank and that’s normal because of the high power capacity. With that said, it’s easy to use and you can still take it with you on your travels, it’s just that you’re moving around more weight and mass


Not a rugged power bank but it holds its own with a strong build. The tech is on par with what the power bank offers with it being able to automatically shut off if things are becoming too heated.


It’s the perfect kind of power bank for traveling and any time when you won’t have a stable source of power. For two main reasons.

It has a humongous power capacity and because it can charge lots of devices at once.

Specs of the MAXOAK 50,000mAh Portable Charger:

USB Charging: Port 1: 5V/2.1A Port 2: 5V/2.1A Port 3: 5V/1.0A Port 4: 5V/1.0A

DC Charging: Port 1: 20V/3A Port 2: 12V/2.5A

  • Input: 16.8V/2.5A Via DC Input
  • LED Power Indicators: 4 LED Dotted Power Capacity Indicators
  • Size: 8.1 x 5.3 x 1.3 inches
  • Weight: 2.7 Pounds


The MAXOAK 50,000mAh power bank has proved itself to be one of the best power banks on the market, at least for the high capacity range.

Its large size and heavyweight aside, the MAXOAK is a strong companion to take with you to places that you doubt that you’ll have a stable source of power, not only for your smartphones or tablets but also for your Laptop. Stay powerful.

  • Superior QualitySAFETY Guaranteed: Conform to UL1642 and UL2056 Standards. Constructed with Lithium-ion Polymer Battery CellsBuilt-in 6 Security Protections to Ensure Safety Use and 1000 Long Recharge Cycles. We Offer Customers a 12 Months Hassle-free 100% Satisfaction Replacement Warranty.
  • Long-lasting DC Power Bank for Laptops:Ultra High Capacity 50000mAh(3.7V)/185Wh(130W Max.).compatible With a Wide Variety of Laptops(Max.130W)- Dell HP Lenovo Surface pro 2/3/4(DC12V) Sony Samsung Acer Toshiba IBM NEC.We Include 14 DC Connector for Various Laptops. Once Fully Charged, K2 Portable Battery Pack Can Charge Laptops(65W) About 2.5 Times and Smartphone About 11-18Times without Using your Laptops/Phones While Charging,It is Much Power Saving than AC Outlet Power Bank.
  • DC20V/DC12V/USB5V Outputs:All-IN-1 FAST CHARGE Battery Pack.It Features with 1DC20V/5A for Laptops(18.5V~20.5V), 1DC12V/2.5A for Cameras,Routers,LED lights, 2USB 5V/2.1A and 2USB 5V/1A For Smart Phones, iPad, Tablet Other USB-Charged Devices. You Can Charge Several Devices Simultaneously to Save You Much Time. Ultra Energy Saving Fast Charging Speed with DC input:16.8V/2.5A, OUR K2 Battery Pack Can Be Recharged in Just 6-8 Hours.
  • Emergency Battery Backup for Outdoors. Size 8.1 x 5.3 x 1.3 And Weight 2.77lb.You Can Easily Put This Portable Charger in Your Briefcase ,Backpack Or the Carrying Bag. Keep your laptops, Phones, Fans,LED Lights, Nintendo Switch, Speakers, Cameras Powered During Road Trip, Hunting,Camping, Fishing,etc.
  • WHAT YOU CAN GET: 1 x Laptop power bank(K2),1 x AC Adapter, 1 x DC cable, 14 x DC connector for Laptops, 1 x Multifunction bag, 1 x Manual.

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