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| I wrote a battery manuracturer about this and this is their reply:
If your trolling motor is 12 Volts nominal, then you can install as many 12 Volt parallel batteries as you like. Each parallel battery will add its capacity to your system. However you must observe the following rules:
1. Connect all positive terminals to each other. Likewise, connect all negative terminals to each other.
2. Make sure all of the batteries are the same brand, that they are same model /size and that they are the same age.
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