EBL 4 Pack CR123A 3V Lithium Battery 2400mWh with Micro USB Cable. 3v battery aa

How to connect batteries in series and parallel

If you have ever worked with batteries you have probably come across the terms series, parallel, and series-parallel, but what exactly do these terms mean?

Series, Series-Parallel, and Parallel is the act of connecting two batteries together, but why would you want to connect two or more batteries together in the first place?

By connecting two or more batteries in either series, series-parallel, or parallel, you can increase the voltage or amp-hour capacity, or even both; allowing for higher voltage applications or power hungry applications.


Connecting a battery in series is when you connect two or more batteries together to increase the battery systems overall voltage, connecting batteries in series does not increase the capacity only the voltage. For example if you connect four 12Volt 26Ah batteries you will have a battery voltage of 48Volts and battery capacity of 26Ah.

To configure batteries with a series connection each battery must have the same voltage and capacity rating, or you can potentially damage the batteries. For example you can connect two 6Volt 10Ah batteries together in series but you cannot connect one 6V 10Ah battery with one 12V 20Ah battery.

To connect a group of batteries in series you connect the negative terminal of one battery to the positive terminal of another and so on until all batteries are connected. You would then connect a link/cable to the negative terminal of the first battery in your string of batteries to your application, then another cable to the positive terminal of the last battery in your string to your application.

When charging batteries in series, you need to use a charger that matches the battery system voltage. We recommend you charge each battery individually to avoid battery imbalance.

Sealed lead acid batteries have been the battery of choice for long string, high voltage battery systems for many years, although lithium batteries can be configured in series, it requires attention to the BMS or PCM.


Connecting a battery in parallel is when you connect two or more batteries together to increase the amp-hour capacity. With a parallel battery connection the capacity will increase, however the battery voltage will remain the same.

Batteries connected in parallel must be of the same voltage, i.e. a 12V battery can not be connected in parallel with a 6V battery. It is best to also use batteries of the same capacity when using parallel connections.

For example, if you connect four 12V 100Ah batteries in parallel, you would get a 12V 400Ah battery system.

When connecting batteries in parallel, the negative terminal of one battery is connected to the negative terminal of the next and so on through the string of batteries. The same is done with positive terminals, i.e. the positive terminal of one battery to the positive terminal of the next.

For example, let’s say you needed a 12V 300Ah battery system. You will need to connect three 12V 100Ah batteries together in parallel.

Parallel battery configuration helps increase the duration in which batteries can power equipment, but due to the increased amp-hour capacity they can take longer to charge than series connected batteries. This time can safely be reduced, without damaging the batteries, by charging faster. Now that the battery is larger, a higher current charge is still the same percentage of the total capacity, and each battery ‘feels’ a smaller current.

While it is often debated what the best way to connect in parallel is, the above method is common for low current applications. For high current applications, talk to one of our experts as your situation may need a special configuration to ensure all of the batteries age at as similar as possible rates.


Last but not least! There is series-parallel connected batteries. Series-parallel connection is when you connect a string of batteries to increase both the voltage and capacity of the battery system.

pack, cr123a, lithium, battery

For example, you can connect six 6V 100Ah batteries together to give you a 12V 300Ah battery, this is achieved by configuring three strings of two batteries.

In this connection you will have two or more sets of batteries which will be configured in both series and parallel to increase the system capacity.

If you need any help with configuring batteries in series, parallel or series parallel please get in contact with one of our battery experts.


Many brands of lithium batteries can not be connected in series or parallel due to their PCM or BMS configuration. Power Sonic’s PSL-SC series of lithium batteries can be connected in series or parallel, ideal for higher voltage or capacity applications.

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The Power Sonic Brand Promise


Manufactured using the latest technology and stringent quality control, our battery products are designed to exceed in performance and reliability.


Our focused approach to exceptional end to end customer experience sets us apart from the competition. From enquiry to delivery and everything in-between we regularly exceed our customers’ expectations.


Delivery on time, every time to customer specifications. We pride ourselves on offering tailored service solutions to meet our customers’ exact specifications.

EBL 4 Pack CR123A 3V Lithium Battery 2400mWh with Micro USB Cable


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Table of Contents

There are so many different types of AA batteries on the market, and it’s hard to know which one is right for you.

How do you decide? Do you buy alkaline or lithium?

Alkaline lasts longer but can leak and break down over time. Lithium batteries last less time but are more stable.

What about rechargeable AAs? They’re expensive and don’t always work on all of your devices.

Today we’ll tell you everything there is to know about AA batteries and their alternatives—so that buying new ones will be a breeze from now on. We’ll even help with choosing the best type of battery for your flashlights.

The Different Types of AA Batteries Available on the Market Today

Rechargeable AA Batteries

Rechargeable AA batteries are becoming increasingly common today. You can find them in many stores, and they come with a price tag that’s more affordable than non-rechargeable batteries.

These types of batteries can help save money in the long run by not having to buy new ones every time they die out.

There are several choices when choosing between rechargeable AA batteries. While some come packaged together with two or four cells complete with chargers, others have individual parts sold separately.

Rechargeable AA batteries come in handy when we find ourselves needing more juice than our devices have left up their sleeves—even if they only last us until lunchtime. With all of the great choices out there today, finding a pack that fits your device is now as easy as pie.

Rechargeable AA battery packs are great because they’re like a single cell when it comes to swapping them in and out. This is much more convenient for devices that need multiple batteries since you don’t have to remove each one separately just so the device can charge or work.

Alkaline AA Batteries

The AA battery is one of the most used in popular electronics such as an alarm clock, some toys and children’s watches. Many people don’t know that you have to be careful with them because they are not rechargeable.

The key advantage about these alkaline batteries is that they’re immediately available for purchase when your battery dies out on you without having to wait weeks or months for delivery.

Alkaline AA batteries are not ideal for regular use in battery-powered devices. They do, however, have one major advantage over lithium AAs: they don’t lose their power even if you leave them unused overnight or on a shelf for years at a time.

Lithium-ion AA Batteries

Lithium-ion cells are often abbreviated to ‘li-ion. They tend not to last for an extended period, but they can be recharged several times before the battery is no longer functional.

The lithium-ion cells are larger and rectangular, often taking the form of button-top AA batteries. They use lithium combined with other compounds and power most electronics today, including laptops, cell phones, and tablets.

On the other hand, AA lithium batteries (non-ion) are meant for quick and powerful bursts of energy but aren’t designed to be recharged. They offer a long-lasting cell type that can power more robust devices such as digital cameras or clocks with compasses built in them.

AA lithium batteries are an excellent choice for most gadgets because they last up to 9 years and don’t leak.

Which Type of AA Battery is Best for Which Situation?

For all-day power, rechargeable AA batteries are best. But they are slightly more expensive initially than disposable batteries.

However, if you use a camera flash or other high-powered device, you should buy rechargeable AA batteries. They have a longer life than regular AA batteries, and use less power.

Lithium-ion batteries are widely used in mobile electronics, though they require protection circuitry to prevent the cell from overcharging.

They have a much higher energy density than other rechargeable batteries and don’t suffer from the memory effect (common with nickel-based cells).

Alkaline batteries provide a constant voltage until all cells inside are used up. These batteries work well in low voltage devices, such as remote controls, toys, flashlights, etc., because they offer more power at lower voltages than other battery types.

Alkaline cells can be recycled into fresh supplies when power runs out for these applications.

AA Battery Type Comparison

AA Battery Type Capacity (mA) Discharge Rate Leakage Protection Type of Devices Best Used in
NiMH Rechargeables 600-2750 High Yes High-powered devices: camera flash, digital camera, handheld video games
Alkalines 1800-2600 Low No Low voltage devices: TV remotes, toys, flashlights
Lithium-ion 2500-3400 Medium Yes Laptops, cellphones, drones

Frequently Asked Questions

What Does AA Stand for in Batteries?

AA batteries stand for either Alkaline-Manganese or Aluminum-Calcium.

Alkaline-Manganese is one of the first battery technologies developed at the turn of the last century by Thomas Edison and his associates. It’s still widely used today in such devices as toys, remote controls, computer mice, desk lamps, and small flashlights.

Aluminum-Calcium, also known as lightweight alkali anode (LWA) cells, were initially developed to provide a lighter alternative to normal zinc chloride cells.

Is a 1.5 V Battery the Same as AA?

A 1.5-volt battery is the same size as AA batteries, but is rated for lower voltage to suit a device with a lighter power requirement such as a flashlight. Just be sure not to mix the two up—because they’re exactly the same battery. Mixing them together will result in low-voltage operation of electronic devices.

Which is better, AA or AAA batteries?

It depends on what type of device you’re powering. AA batteries are best for low power drain devices such as camera flashes because they last much longer than AAA batteries.

By contrast, AAA batteries are the better choice for high-power battery devices such as video game controllers because they provide a more current and higher voltage.

It should also be noted that many brands offer hybrid AAAs, which provide the advantages of both AAs and AAA, so it’s worth considering these other types too when making your purchasing decision.

Used Household Batteries

Find information about the types of batteries used in households and how to manage them when they are no longer needed.

Certain batteries should NOT go in household garbage or recycling bins. This page can inform you on how to manage these batteries safely. Waste batteries can always be recycled or taken to household hazardous waste collection points.

To prevent fires from lithium-ion batteries, tape battery terminals and/or place batteries in separate plastic bags and never put these batteries in household garbage or recycling bins.

On this page:


Every year in the United States, millions of single use and rechargeable batteries are bought, used and recycled or disposed of in the trash. Batteries come in various chemistries, types and sizes to fit their use.

  • Single-use batteries can generally be removed from the device when they stop powering the device.
  • Rechargeable batteries may be removable or permanently attached to the device.

The increased demand for batteries can be traced largely to the Rapid increase in use of small portable electronics, power tools, and other everyday items, as well as the increase in “Smart” products, such as small and large appliances and automobiles.

Batteries are manufactured using different mixtures of chemical elements designed to meet customers’ power and performance needs. Batteries can contain metals such as mercury, lead, cadmium, nickel and silver, which can pose a threat to human health or the environment when improperly managed at the end of their service life. Battery types are identified by marking and labeling, not by the battery’s shape or the color of the label.

Some batteries may also contain materials such as cobalt, lithium and graphite that are considered critical minerals by the United States Geological Survey. Critical minerals are raw materials that are economically and strategically important to the United States and have a high supply risk potential and for which there are no easy substitutes. Consequently, every effort should be made to recycle and recover these materials to ensure they will be available for generations to come.

Learn about infrastructure investments to improve the nation’s battery recycling programs.

Once a battery is no longer useful, the type and chemistry of the battery determines which of the various waste management options to use. It is important to manage batteries correctly according to their type because some batteries can cause a risk to safety and health if mismanaged at the end of their lives. Batteries can have enough energy to injure or start fires even when used and when they appear to be discharged. For safety, remember that not all batteries are removable or serviceable by the user—heed battery and product markings regarding safety and use for all types of batteries.

Single-Use Batteries

Alkaline and Zinc-Carbon

Some reclamation companies recycle these batteries; check with your local or state solid waste authority for management options. In most communities, alkaline and zinc carbon batteries can be safely put in your household trash.

EPA recommendation: send used alkaline and zinc carbon batteries to battery recyclers or check with your local or state solid waste authority.

Button-Cell or Coin

Button-cell or coin batteries can be a potential swallowing hazard; store them out of the reach of young children.

Management requirements are based on the battery’s chemistry. They can be brought to specialized battery recyclers, participating retailers that provide battery takeback services or local household hazardous waste collection programs. Contact the manufacturer or local solid waste authority for additional management options.

Handling precautions: Place each battery in separate plastic bags or place non-conductive tape (e.g., electrical tape) over the battery’s terminals or around the entire button. A lithium battery may spark and cause fires if damaged or the terminal ends touch. If the battery becomes damaged, contact the manufacturer for specific handling information.

EPA recommendation: Check for the word “lithium” marked on the battery. Do not put button-cell, coin, or lithium single use batteries in the trash or municipal recycling bins. Find a recycling location near you:

Lithium Single-Use

Rechargeable Batteries

Nickel Cadmium (Ni-Cd)

  • These batteries are typically used in cordless power tools, cordless phones, digital and video cameras, two-way radios, bio-medical equipment and video cameras.
  • They may look like single-use AA, AAA or other alkaline batteries or a battery pack shaped for specific tools.

Removable batteries: Removable rechargeable batteries can be brought to specialized battery recyclers, participating retailers that provide battery takeback services, or local household hazardous waste collection programs. Contact the manufacturer or your local household waste authority for other management options.

Non-removable batteries contained in electronic devices: Entire devices can be brought to certified electronics recyclers, participating retailers that provide electronics takeback services, or local electronics or household hazardous waste collection programs.

Handling precautions: Place each battery in a separate plastic bag or place non-conductive tape (e.g., electrical tape) over the battery’s terminals. Handle any damaged battery with care and appropriate personal protective equipment. If a lithium-ion battery becomes damaged, contact the battery or device manufacturer for specific handling information.

EPA recommendation: Look for labels identifying battery chemistry. Do not put rechargeable batteries in the trash or municipal recycling bins. Find a recycling location near you:

Lithium-Ion (Li-ion)

Nickel Metal Hydride (Ni-MH)

Nickel-Zinc (Ni-Zn)

Small-Sealed Lead Acid (Pb)

  • Commonly found in mobility scooters, children’s toy cars, emergency lighting and hospital equipment. Also used for backup power in residential landline phones and uninterruptable power supplies for computers.
pack, cr123a, lithium, battery

Automotive Batteries

There are several types and applications of batteries used in vehicles today. There are automotive starting batteries used with internal combustion engines, large electric vehicle battery packs that power the vehicle and small batteries that power accessories such as remote door locks or back up the computer’s memory.

  • Lead-acid batteries may contain up to 18 pounds of lead and about one gallon of corrosive lead-contaminated sulfuric acid.
  • They can be used as either an engine starting battery or automotive power battery that moves the vehicle.
  • They can be found in automobiles, boats, snowmobiles, motorcycles, golf carts, all-terrain vehicles, wheelchairs, and other large transportation vehicles.
  • They may also be used in non-automotive situations such as backup power in basement sump-pumps or as uninterruptible power supplies for computers or other critical equipment.

Return to the battery retailer or your local solid or household hazardous waste collection program.

Handling precaution: Contains sulfuric acid and lead. When handling the battery, follow all warnings and instructions on the battery.

EPA recommendation: Return lead-acid batteries to a battery retailer or local household hazardous waste collection program ; do not put lead-acid batteries in the trash or municipal recycling bins.

  • Most of today’s plug-in and hybrid electric vehicles and energy storage (on and off-grid) use Li-ion batteries to either store power for the hybrid system or to power the electric motor that moves the vehicle.
  • These batteries are also used for energy storage systems that can be installed in buildings.

Because of the size and complexity of these battery systems, medium and large-scale Li-ion batteries may not be able to be removed by the consumer. Refer to the manufacturer’s instructions and heed warnings and safety instructions.

  • Automobile: Contact the automobile dealer, shop or salvage yard where the battery was purchased.
  • Energy Storage: Contact the energy storage equipment manufacturer or company that installed the battery.

EPA recommendation: Contact the manufacturer, automobile dealer or company that installed the Li-ion battery for management options; do not put in the trash or municipal recycling bins.

State Battery Recycling Laws

Some states have enacted battery recycling laws for various types of consumer batteries. To see a map of state battery laws, go to the Call2Recycle website.

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