Three and one half years old batteries is not unusual to some of the pack batteries to start falling off the grid in a 48 volt pack.
Even if we isolate the bad ones we can not replace with a new battery as it will have adverse effects in the old pack.
Proper charging is always a factor and your standard charger is all the doctor ordered to maintain a good life for your batteries.
PeriodLy use of a battery minder system is always an advantage for the sake of disulfating the battery pack but hard Villages
Driving habits in my opinion requires full amperage charge from stock chargers supplied with the cart.
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