Energy Information > Series or Parallel...

"Connecting your Batteries in Series or Parallel"

By Bryan Noonan
September 21, 2004

We frequently get asked the question, "How am I supposed to connect my battery if I want to double the capacity?", or similar questions. It can be confusing if you've never done it, but hopefully this'll make it simpler. Be sure to read the important notes at the bottom to protect yourself
from damaging any equipment!

Connecting in Series
When connecting your batteries in Series you are doubling the voltage while maintaining the same capacity rating (amp hours). This might be used in a scooter, Power Wheels kids vehicle, or other applications.
Just use a jumper cable between the negative of the first battery and the positive of the second battery. Run your negative wire off of open connector of the first battery and your positive off of the open connector on your second battery.

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Connecting in Parallel
When connecting in Parallel you are doubling the capacity (amp hours) of the battery while maintaining the voltage of one of the individual batteries. This would be used in applications such as laptop batteries, some scooters, some ups backups, etc. Use a jumper cable between the positives of both batteries and another jumper cable between the negatives of both batteries. Connect your positive and negative wires to the same battery to run to your application.

Important notes:
When connecting batteries in a pack there are some important things to keep in mind -

- Find out the requirements of your application. For example:
Don't double the capacity on your Power Wheels vehicle if you're not supposed could burn up the engine. Follow the recommended guidelines for your application.

- Don't use two different chemistries when connecting a pack. Usually the voltages will be different, but more importantly the charge rates will be different and the capacities may be different, thus resulting in a shortened life span.

- Try to match capacities as much as possible. When connecting batteries in a pack you should try to match the capacities as much as possible to avoid discharging one battery quicker than another. A pack operates at a combined voltage so your one cell that discharges quicker will likely discharge deeper than it may be able to recover from.

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