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Never drop past 12 vlts and charge at max of 10% of capacity of battery...
Estimate what you need and buy battery that drains only 15% if you use that amount.
It is best to get bigger than less as best policy with rechargable lead acid batteries and to under use it. And out in the cold is not good for a battery.
And dont leave it sitting on a cold floor when not in use.
Keep it clean particularly the surface between terminals...mmm yes all over ..put your multi meter on a terminal and on the surface of the battery and you may get a surprise at the reading when dirty.
Alex
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