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If a 12v car battery is down to 6v can you still charge it? Answered

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rickharris (author)2010-09-12
Mmmm The wisdom says anything less than 10.5 is seriously damaging and needs special efforts to recharge.


A desulphator circuit (search for it) may help.

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steveastrouk (author)rickharris2010-09-12

Yes, its very deeply discharged. If its happened recently, it may live.

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Re-design (author)steveastrouk2010-09-12

But it will probably only live until cold weather. I've found that once discharged this low mine usually fail the first winter.

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NachoMahma (author)2010-09-12

.  It's worth a try, but don't have high expectations.
.  It will probably charge (as has been mentioned, you may need a good charger to handle it), but it quite likely will not be as good a battery as it was before - it probably won't hold a charge as long and probably will not put out as much current under full-load.
.  If you want to know why, Google "battery sulfation".
.  Good luck.

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lemonie (author)2010-09-12


If it looks sick like it might need to be retired, why not just try charging it?
But if you've got cell-failures, you can't fix 'em. It gets h0rrible in there,full of sludge...

L

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steveastrouk (author)2010-09-12

Yes....but you may find it blows the fuses on your charger. You need to charge it, or it will die from sulphation.

Steve

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