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You need to keep the batteries in parallel. The positive poles of the battery are to be connected together. Also the negative poles need to be connected together. This will maintain the voltage at 12 volts and also give you double the endurance when discharging the batteries when connected to a load.

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Q: When hooking 2 12 volt batteries together which poles do you use to connect the 2 batteries to what ever you are using to kept a 12 volt system?
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