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1986 FZ 600
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If I use 4 50 amp 12v batteries in my 48v cart will that give me 200 reserve amps?
You are going to connect those 12V batteries in series. Connecting in series ads the voltage - that will give you the 48V you need. You will still only have 50A but the voltage will be 48V.

If you connected them in parallel that adds the amperage. You will still only have 12V but you will have 200A capacity.

Think of it like water. 4 hoses hooked up to a tank of water. Series is like turning on all four hoses at once - lots of water but the tank drains faster - more power/voltage. Parallel is like just running one hose - less water but lasts four times longer - more capacity/amperage.
 
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