330W Portable Power Station. 19v power bank

Laptop Power Bank Circuit

The following post explains how to build a simple laptop power bank circuit which can be used for charging a laptop battery during travelling or during outdoor trips.

330w, portable, power, station, bank

This device can be specifically useful on situations or places where an AC mains outlet is unavailable or difficult to find.

Why Laptops Need a Battery

Just like mobile phones, laptops are also portable gadgets that require a battery to operate when there’s no mains AC supply is available.

This is the main advantage of laptops over PCs since a laptop can be carried with us while travelling and can be operated from anywhere outdoors.

This becomes possible because a laptop has an in-built battery. The battery provides the required power supply to the device whenever needed, and allows the laptop to work without the need of an AC mains supply outlet.

Laptops are so portable and handy that these can be opened and operated by anybody on top of their laps, and hence the name laptop.

Which battery is used in Laptops

In most of the cases the preferred battery for a laptop is a Li-Ion battery.

Li-ion battery batteries are one of the most efficient types of batteries with a very high power-to-weight ratio.

Power-to-weight ratios signifies that the battery is capable of providing long backups at high power rates through relatively smaller light weight packages.

The voltage specifications of a laptop may vary for different laptops.

Some laptop may work with a 11.1 V battery some laptops may work with 14.8 V battery and some other types may work using batteries with higher voltage rating.

The average current rating of a laptop battery may be around 4000 mAh which can provide a backup power for a period of approximately 4 hours.

In this post we will learn how to build a laptop power bank circuit for a laptop using a 11.1 V Li-Ion battery.

The 11.1 V laptop battery uses 6nos of Li-Ion cells each rated at 3.7 V. The 6 cells are configured as 3S2P, meaning, two parallel sets of batteries each having 3 cells in series.

The mAh rating of each cell could be around 2000 mAh. Therefore two parallel sets would result in a total mAH rating of 4000 mAh.

Since there are 3nos of 3.7 V Li-ion cells are involved, the total voltage of the laptop battery becomes:

This 11.1 V value is the level where the battery is at around fully discharged state.

Since the full charge value of each 3.7 V Li-Ion cell is 4.2V, the total value of a fully charged 11.1 V laptop battery would be:

How to Build a Laptop Power Bank Circuit

The idea of the laptop power bank circuit is simple. We want to use a set of chargeable batteries in the power bank which has higher voltage specifications than the laptop battery.

This means, when the higher voltage from the power bank is connected with the laptop battery, the charge from the power bank battery starts transferring into the laptop battery. This continues until the laptop battery is fully charged and the power bank battery is discharged.

Since the laptop battery has 2 parallel sets of batteries with 3 series cells on each set, we will use a higher configuration of 4S2P. Meaning our power bank will have a 2 parallel sets of battery with each set having 4 cells in series.

With a configuration of 4 series cells, the total fully charged voltage of our power bank circuit will be:

Each cell can be rated 2000 mAh, which will allow the configuration to have a specification of 16.8 V 4000 mAh.

The complete connection diagram of the laptop power bank battery can be seen in the following figure:

In the above figure we can see how a 4S2P (4 series, 2 parallel) combination of Li-Ion cells are configured to build a power battery pack of 16.8 V.

Specifications of each of the cells used in the battery pack are as follows:

Using Voltage Regulator

Although now we have an easy laptop power bank set up ready with us, the 16.8 V output is not safe to be directly applied to a laptop battery. Therefore, we need a voltage regulator that would regulate the 16.8 V into a constant 12.6 V.

For this we yet again rely on our work horse regulator IC LM338.

Using IC LM338 and a few other passive components we can build a very efficient, full fledged laptop power bank charger circuit, as shown in the following figure.

In the above design, the potentiometer R2 should be precisely adjusted to get 12.5 V at the output which can be then used for charging a laptop battery.

Although the full charge level of an 11.1 V laptop battery is 12.6 V we must adjust the output from the LM338 to precisely 12.5 V which is 0.1 V less than the full charge value.

This ensures that the laptop battery can never get over charged even if the power bank circuit is connected indefinitely with the laptop battery.

Calculating the Constant Current Resistor

Another aspect that Li-Ion batteries are typically critical about is the charging current which must be constant and limited. That’s exactly why RX is positioned in the above shown LM338 circuit.

You will have to adjust the value so that it limits the current to a constant 0.5 C value which is equivalent to 50% of the laptop battery’s mAh rating.

The value of the RX can be fixed using the following formula:

RX = 0.6 / 2 amp = 0.3 ohms

wattage = 0.6 x 2 = 1.2 watts or simply 2 watts

Make sure to apply a good heatsink on the IC LM338

The 0.6 V signifies the turn ON voltage of the BC547 transistor. When the current consumption tries to exceed the 2 amp value, it causes a voltage of 0.6 V to develop across the 0.3 ohm resistor which in turn causes the BC547 to switch ON. When the BC547 switches ON it shorts the ADJ pin of the LM338 to ground shutting it off. Shutting off LM338 at 2 amp consistently, prevents the charging current from exceeding the 2 amp mark.

How to Charge the Power Bank?

Before you can take the power bank unit with you for charging the laptop battery, you have to make sure the power bank battery is itself fully charged, otherwise it won’t serve the purpose.

The idea is simple, construct another LM338 voltage regulator same as the one shown in the above image. However, since the power bank battery pack’s full charge voltage level is 16.8 V, the output voltage from the LM338 regulator must be adjusted to a precise 16.7 V.

The complete circuit diagram for the power bank charger can be witnessed in the following figure.

Again, here too we adjust the charging voltage 0.1 V less than the full charge level of the battery to make sure the battery pack never gets fully charged.

This concludes our article on how to build a laptop power bank circuit, if you any further questions please let me know through the below comment box, I will try to solve your queries ASAP.

You’ll also like:

  • 1. nbspBicycle Dynamo Battery Charger Circuit
  • 2. nbspLead Acid Battery Charger Circuits
  • 3. nbspSec Exciter Powered HV Capacitor Charger Circuit
  • 4. nbspOne Transistor Automatic Battery Charger Circuit
  • 5. nbspBattery Deep Discharge Protection Circuit
  • 6. nbsp48V Solar Battery Charger Circuit with High/Low Cut-off

Dc 5v 19v 19.5v Innovative Products Power Bank 17.5v Rechargeable Portable Mini Ups Solar System 12v

Add success, do you want to check your shopping cart?

Dc 5v 19v 19.5v Innovative Products Power Bank 17.5v Rechargeable Portable Mini Ups Solar System 12v

Dc 5v 19v 19.5v Innovative Products Power Bank 17.5v Rechargeable Portable Mini Ups Solar System 12v

super fashion emergency 5v 9v 12v 110v 220v 230v 330w portable power source plant solar generator

excellent longlife 110v 220v ac dc 330w 500w portable source solar power system home generator
Item : Specifications :
Rated power : 330W solar power system home portable
Rated capacity : 288.6wh portable power generator
Standard capacity : 3.7V78000mAh 93600mah 96000mah 90000
Overload protection: 360(-)10W
AC output : 110V(-)10%/60HZ;220V(-)10%/ 50HZ
Output Wave : Sine Wave
USB output : QC3.0/18W
Type-C output : QC3.0/18W
Cigarette lighter output : 12V/10A
DC 5521 output : 12V5A
Wireless charging : 5W
Charging input Voltage : 12-24V
Working temperature : ▬10-40°C
Weight(Net weight) : ≈3.3kg
Weight(with accessories): ≈4.3kg
Dimension : 205165155mm

Portable Power Station Generator produce clean. environment-friendly, quiet solar energy electricity which convert from sun directly. safely and best of all saves money ! The portable power bank is very convenience for emergeny and outdoor activites. people can benefits a lot from this solar system 12v. ups 12v ups 12v no fuel need. rechargeable portable mini ups 12v which is good for no power supply as well as outdoor activities.

VGLORY lifepo4 lithium solar portable power station 100W 330W 500W 700W 1000W 1500W
LED light : Super Brightness LED Panel
Design : Extreme Compact Powerful Design
Buit-in Battery : 100% A Grade Lithium battery
Cycle life : above 800times
Charging Mode : CC/CV
Output port : Custom accordingly to different countries
Operation Humidity : 10%~90%
Built-in : Perfect MPPT function
Various Colour options : Red. orange ,yellow. green. blue ,purple
Power Indicator : LED Display
Protection type : Intelligent BMS selif-balancing system
Cooling function : Intelligent Cooling system
Include Full Productions : Short Circuit. Overload, over charge ,over current ,over voltage, over discharge,over temp protections,Anti-protections

Vglory 200w 330w 500w ,700w 1000w portable power station. various options solar power system home portable. while you are camping. fishing. expansion. marine any outdoor exercise. Keep usual life while power shortage ;To charge your lamps, fans, laptops, phones, TVs etc … Good for use in home emergency power. Island. remote moutains areas. vila. tourist resorts. highway, farms ,Marine. and any other no power supply areas ;

A bout

Vglory battery company is professional in producing. researching marketing in Lithium battery. with professional engineer team with more than 10years experiences ,

widely range fashion style 200w portable power source. 330w portable power generator. 500w 700w 1000w power station portable. OEM service. manufacturing strictly accordingly to ISO9001-2008. equipped with advanced equipments and testing machine; contact us. our high quality and competitive price will surprise you.

Advanced Automatic Equipment ensure the excellent battery pack processing : Our lithium portable power station win super long cycle lifespan. high charge discharge rate. high energy density, super stable performance and safety in different temperature environments. We pay much attention on each steps which ensure providing our client with the senior quality portable power solar generator. which gained high reputations among our clients ! Battery cells capacity sorting : ensure the precision of cell balance as ensure assembled the best capacity and quality of portable power bank station. Battery cells IR testing : Undertaking internal resistance testing ensure the best consistency for the best combination of portable power pack. Battery pack multi testing: which ensure the best power performance and prolong lifespan of solar portable power station. Automatic Welding : which can avoid insufficient welding as ensure the high quality assembling of power generator portable. Spot Automatic welding : By using full / semi-automatic production equipment to improve production efficiency and product’s quality. Comprehensive Testing : Using automatic test equipment. comprehensive test of large batteries. cycles. IR, consistency. accurate data. perfect curve. ensure 100% qualified.

Professional Engineer team : Own an excellent engineer team with more than 10years’ rich experiences in lithium battery RD. design the excellent battery solution for clients ! Our mechanical and electrical engineer is professional in structural. software and hardware for designing the best customized battery. which ensure our battery pack comply with most competitive cells. battery pack and BMS solutions with the advanced lithium technology If your have any questions. any inquiry. pls kind contact us for the best solutions and the latest quotations ! WELCOME YOU. ! Good Raw material supply chain : we have built a long-term business relationship with the well-known IC and battery cells companies. which ensure provoding our clients with high quality and powerful performance battery pack. Quick produtiondelivery : We can get production ready of your order quickly. normally 7days~15days. QC checking : ensure 100% quality testing passed before shipment. Professional Logistic team : shipping team arrange shipment asap once shipment ready. by air or express ,by sea per clients instructions ! Competitive price, good sale and after-sales service ! Global exihitions : Well attrached global clients for the best battery solutions inquiries ! Excelent Service : reply within 24 hours. Good quality and competitive price. quick shipment … we always insist on carrying out the supreme principle and taking technical support as the basis. Helping customers to win the good satisfactions and good business ! Factory competitive price : Welcome you contact us for the best latest price. pls JUST send your inquiry. we have series options available for your making good business ! Give you the SURPRISE ! NOW ! Get BEST from us ! Pls JUST send inquiry. ! Thank you !

When people are dressing this garment, it will greatly improve their overall temperament and personalities. It will help people get many compliments from others. Its super long life makes it a worthwhile investment and a Smart long-term solution. This product worths the investment. It allows the wearer to get go a long way in making himself or herself stand out Said one of our customers. Its super long life makes it a worthwhile investment and a Smart long-term solution.

DIY Laptop PowerBank

In this project I will show you how to create a Laptop PowerBank. It mainly consists of a Li-Ion battery pack and one buck and boost converter. This way the PowerBank can get charged up through the Laptop power supply and aftewards charge up the Laptop directly to give it an additional run time of 3 hours. Let’s get started!

Step 1: Watch the Video!

The video gives you all the information for a basic overview of the project. During the next steps, I will present you more detailed information.

Step 2: Order Your Components!

Here you can find a parts list with example seller (affiliate links):

Step 3: 3D Print the Enclosure!

Here you can find the 123D files as well as the.stl files for my enclosure. But make sure that you also print the corrected lid file which is 5mm longer.

Step 4: Do the Wiring!

Here you can find the wiring schematic along with tons of reference pictures of my laptop powerbank. Feel free to use them to create your own powerbank.

Step 5: Success!

You did it! You just created your own Laptop PowerBank!

Feel free to check out my YouTube channel for more awesome projects:

You can also follow me on. and Google for news about upcoming projects and behind the scenes information:

Be the First to Share

Did you make this project? Share it with us!

Magnets Contest

Комментарии и мнения владельцев

According to links the LiFePo4 BMS is used with Li-Ion batteries. Those are different chemistries and have different working voltage. For discharge and charge. I do not understand how is it can even work. It should already give problems at first discharge.

This is an awesome project and a must doing it.

Hey I stumbled in this video am so amazed I will like to make one, but how do I charge the battery when it run down.Thanks

So amazing, that’s why i regarded you l as my mentor in electronic eng. I will give it try and share the experience i get. Thanks

The enclosure looks fantastic. Really clean 🙂

i don’t think that it matters. the laptop will draw the required amount of current. all you need to make sure is that the convertor you’re using supports the current draw of the laptop.He only limited the current on the batteries as they have a current limit recommendation and exceeding that can lead to the battery degrading faster than normal or possibly causing fires.

i know this is a late reply but hope it answered your question and helps anyone else out.

EBay links aren’t really helpful as once products are sold the link changes. Perhaps a link to an online retailer with a suggestion to check eBay.

can somebody send me the files seperate

can u up load each part separate because i can not print all at once

Since I am not a EE, I am looking for one who can create a PCB for my powerbank with nand chip on it for prototyping. I know I can order such pcb’s from China for powerbanks but I need an extra function on my device for storage. the measurement of such pcb would be around 150mm/200mm by 1000mm (see pic as a format), double or triple layers. I have a small budget can pay you but let me know your rate.

a better solution would be to increase the laptop battery

That’s a great project. I’m happy to see you included all the safety measures in it.I had the same problem of less working time out of my old laptop battery. So I got a new battery and now if the battery dies, I can hibernate the laptop(it auto hibernate when battery level drops), switch out the battery and continue working. Much simpler method but yours is much cooler 🙂

This is amazingly, excellent !

This is amazing! Any workaround to save costs on the BMS?

Have a look on AliExpress, you can save a few bucks at least. I did a quick search for an 8s 24v BMS, and saw a few listed over there.

Laptop Power Bank Circuit

The following post explains how to build a simple laptop power bank circuit which can be used for charging a laptop battery during travelling or during outdoor trips.

This device can be specifically useful on situations or places where an AC mains outlet is unavailable or difficult to find.

Why Laptops Need a Battery

Just like mobile phones, laptops are also portable gadgets that require a battery to operate when there’s no mains AC supply is available.

This is the main advantage of laptops over PCs since a laptop can be carried with us while travelling and can be operated from anywhere outdoors.

This becomes possible because a laptop has an in-built battery. The battery provides the required power supply to the device whenever needed, and allows the laptop to work without the need of an AC mains supply outlet.

Laptops are so portable and handy that these can be opened and operated by anybody on top of their laps, and hence the name laptop.

Which battery is used in Laptops

In most of the cases the preferred battery for a laptop is a Li-Ion battery.

Li-ion battery batteries are one of the most efficient types of batteries with a very high power-to-weight ratio.

Power-to-weight ratios signifies that the battery is capable of providing long backups at high power rates through relatively smaller light weight packages.

330w, portable, power, station, bank

The voltage specifications of a laptop may vary for different laptops.

Some laptop may work with a 11.1 V battery some laptops may work with 14.8 V battery and some other types may work using batteries with higher voltage rating.

The average current rating of a laptop battery may be around 4000 mAh which can provide a backup power for a period of approximately 4 hours.

In this post we will learn how to build a laptop power bank circuit for a laptop using a 11.1 V Li-Ion battery.

The 11.1 V laptop battery uses 6nos of Li-Ion cells each rated at 3.7 V. The 6 cells are configured as 3S2P, meaning, two parallel sets of batteries each having 3 cells in series.

The mAh rating of each cell could be around 2000 mAh. Therefore two parallel sets would result in a total mAH rating of 4000 mAh.

Since there are 3nos of 3.7 V Li-ion cells are involved, the total voltage of the laptop battery becomes:

This 11.1 V value is the level where the battery is at around fully discharged state.

Since the full charge value of each 3.7 V Li-Ion cell is 4.2V, the total value of a fully charged 11.1 V laptop battery would be:

How to Build a Laptop Power Bank Circuit

The idea of the laptop power bank circuit is simple. We want to use a set of chargeable batteries in the power bank which has higher voltage specifications than the laptop battery.

Since the laptop battery has 2 parallel sets of batteries with 3 series cells on each set, we will use a higher configuration of 4S2P. Meaning our power bank will have a 2 parallel sets of battery with each set having 4 cells in series.

With a configuration of 4 series cells, the total fully charged voltage of our power bank circuit will be:

Each cell can be rated 2000 mAh, which will allow the configuration to have a specification of 16.8 V 4000 mAh.

The complete connection diagram of the laptop power bank battery can be seen in the following figure:

In the above figure we can see how a 4S2P (4 series, 2 parallel) combination of Li-Ion cells are configured to build a power battery pack of 16.8 V.

Specifications of each of the cells used in the battery pack are as follows:

Using Voltage Regulator

Although now we have an easy laptop power bank set up ready with us, the 16.8 V output is not safe to be directly applied to a laptop battery. Therefore, we need a voltage regulator that would regulate the 16.8 V into a constant 12.6 V.

For this we yet again rely on our work horse regulator IC LM338.

Using IC LM338 and a few other passive components we can build a very efficient, full fledged laptop power bank charger circuit, as shown in the following figure.

In the above design, the potentiometer R2 should be precisely adjusted to get 12.5 V at the output which can be then used for charging a laptop battery.

Although the full charge level of an 11.1 V laptop battery is 12.6 V we must adjust the output from the LM338 to precisely 12.5 V which is 0.1 V less than the full charge value.

This ensures that the laptop battery can never get over charged even if the power bank circuit is connected indefinitely with the laptop battery.

Calculating the Constant Current Resistor

Another aspect that Li-Ion batteries are typically critical about is the charging current which must be constant and limited. That’s exactly why RX is positioned in the above shown LM338 circuit.

You will have to adjust the value so that it limits the current to a constant 0.5 C value which is equivalent to 50% of the laptop battery’s mAh rating.

The value of the RX can be fixed using the following formula:

RX = 0.6 / 2 amp = 0.3 ohms

wattage = 0.6 x 2 = 1.2 watts or simply 2 watts

Make sure to apply a good heatsink on the IC LM338

The 0.6 V signifies the turn ON voltage of the BC547 transistor. When the current consumption tries to exceed the 2 amp value, it causes a voltage of 0.6 V to develop across the 0.3 ohm resistor which in turn causes the BC547 to switch ON. When the BC547 switches ON it shorts the ADJ pin of the LM338 to ground shutting it off. Shutting off LM338 at 2 amp consistently, prevents the charging current from exceeding the 2 amp mark.

How to Charge the Power Bank?

Before you can take the power bank unit with you for charging the laptop battery, you have to make sure the power bank battery is itself fully charged, otherwise it won’t serve the purpose.

The idea is simple, construct another LM338 voltage regulator same as the one shown in the above image. However, since the power bank battery pack’s full charge voltage level is 16.8 V, the output voltage from the LM338 regulator must be adjusted to a precise 16.7 V.

The complete circuit diagram for the power bank charger can be witnessed in the following figure.

Again, here too we adjust the charging voltage 0.1 V less than the full charge level of the battery to make sure the battery pack never gets fully charged.

330w, portable, power, station, bank

This concludes our article on how to build a laptop power bank circuit, if you any further questions please let me know through the below comment box, I will try to solve your queries ASAP.

You’ll also like:

  • 1. nbspBicycle Dynamo Battery Charger Circuit
  • 2. nbspLead Acid Battery Charger Circuits
  • 3. nbspSec Exciter Powered HV Capacitor Charger Circuit
  • 4. nbspOne Transistor Automatic Battery Charger Circuit
  • 5. nbspBattery Deep Discharge Protection Circuit
  • 6. nbsp48V Solar Battery Charger Circuit with High/Low Cut-off
330w, portable, power, station, bank

Leave a Comment