deep cycle battery charging trick - Printable Version

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+--- Thread: deep cycle battery charging trick (/showthread.php?tid=326)

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deep cycle battery charging trick - encantotom - 11-03-2012

hi,

this isnt for the coach, but i guess could be.

i have an electric GEM car. it is a 4 seat glorified golf cart that is street legal. it is a 72v system. i am getting ready to sell it so in the spring i put new batteries in it. i basically then totally ignored it and some parasitic drain took the six 12v deep cycle batteries down to almost totally dead. below 4v.

yea, i know it was dumb, i should have charged them every few weeks...

that said, once i disconnected the batteries from being in series, i have to charge each one to get i think to 9v or so for the onboard charger to take over.

so i put my battery charger on one of them and walla....nothing. no charging or voltage.

scratching my head, i thought, maybe my charger is fried. so i hooked it up to darlenes honda (of course i didnt experiment with my f350) and the charger started humming and charging.

making a long story short, ends up that the charger will not turn itself on unless there is about 4v on the battery. so you have to trick it. so i hooked the charger up to the battery, then i used jumper cables between darlenes CRV and the deep cycle battery and then turned the charger on and it started charging. i let it hum for a minute or two, then disconnected the jumper cables and it is still charging.

could be each charger is different, but i would guess that is a common feature with the voltage to turn on varying a little bit.

thats my trick of the day.....

probably most of you knew it and i was the last kid on the block to figure it out....

tom

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RE: deep cycle battery charging trick - Erniee - 11-03-2012

Tom- you are talking electricity. I don't get it, too old to try, if it turns on with a switch, all is good.

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