yes a cable might cause its not odd for voltage to creep up when sitting and 50+ at full charge i think is in the normal range.........mine go higher but not all sets do that..........if your not sure about the cable might not be a bad idea to redo it............if the charger times out at 16 hours just pull all plugs for a few minutes and than start charging all over.............keep an eye on things they will get better as batteries break in.....whats the date code on them?................................
