I do not know if this is the "recommended" procedure, but it works for me when my cart has been unused for a long time:
1) make sure the water level in each battery is just above the metal plates
2) plug in charger and charge fully
3) unplug charger then fill batteries with water to their usual "full" level
I fully-charge the batteries and top them up with water before leaving for a long time
and, if you can, have a neighbour recharge them every month while you are away
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