Here’s the rule – series doubles the voltage, parallel provides longer power. “But how am I supposed to connect my battery if I want to double the capacity but not the voltage?”
It can be confusing if you’ve never done it, but hopefully this will make it easier. Let’s give you a picture to show how it is done –
Connecting in Series
When connecting your batteries in series you are doubling the voltage while maintaining the same capacity rating (amp hours). Just use a jumper wire of sufficient gauge (usually 2 – 8) between the negative of the first battery and the positive of the second battery. Run your negative wire off of the open connector from the first battery and your positive off of the open connector on your second battery.
Connecting in Parallel
When connecting in parallel you are doubling the capacity (amp hours) of the battery while maintaining the same voltage individual batteries. Just use a jumper wire of sufficient gauge (usually 2 – 8) between the positives of both batteries and another jumper wire between the negatives of both batteries. Connect your positive and negative wires to the same battery to run to your application.
- Try to use the same brand and model batteries whenever possible.
- Don’t put more power to your equipment than is stated by the manufacturer. You could easily blow your equipment up.
- Use heavy enough wire for connections. Usually 2 – 8 gauge is sufficient. Use jumper cables to ensure you have the right gauge.
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