Dangle_kt
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| posted on 5/11/12 at 05:11 PM |
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Dead battery showing 5v - recoverable?
Hi,
Wondering if any of you guys know if a 12v battery reading 5v will charge or not.
Track day tomorrow, just went to start it up, and its dead. Got it on charge, but if I dont run soon I won't make it to halfords before it shuts
- so....
will it charge or should i buy one?
Thanks
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fullpint
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| posted on 5/11/12 at 05:29 PM |
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If I were you I would try in now just to see if its started to charge. If not go get a spare. Not worth turning up for a track day only for the
battery to fail...
Keep the receipt and if yours is ok just pop the new one back to halfords for a refund 
I've over 28 years in dealing with magnesium wheels. Refurbishment and can powder coat most metal parts. Visit my web site if you wish..
www.tpcs-magnesium-refurbs.co.uk
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ian locostzx9rc2
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| posted on 5/11/12 at 05:30 PM |
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I doubt it Ill be off to halfords
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Dangle_kt
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| posted on 5/11/12 at 05:38 PM |
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quote:
Originally posted by fullpint
Keep the receipt and if yours is ok just pop the new one back to halfords for a refund
Now that is a cracking idea!
At £55 I don't fancy buying one when I don't really need it! 
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fullpint
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| posted on 5/11/12 at 05:39 PM |
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Simple really. They can't say no if you don't use it Its a win win situation..
I've over 28 years in dealing with magnesium wheels. Refurbishment and can powder coat most metal parts. Visit my web site if you wish..
www.tpcs-magnesium-refurbs.co.uk
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vanepico
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| posted on 5/11/12 at 07:26 PM |
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I fly RC planes and we are told if you take the Lithium polymer batteries below a certain level they are fubar'd. What you can do is fool the
charger into charging it anyway to maybe 50%, by setting it to nicad/nimh, then at that point you switch the charger back to li-po cells and charge
the rest. It worked for me once.
(They say this normally only works if it was a slow discharge)
Maybe this technique will work with car batteries but to be honest I'd rather spend a bit of money than be stuck at the side of a road, maybe
keep a battery in the car as a spare if you try it.
Have a nice day,
Pete
__________________________
Will CAD for food/money/beer...
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Dangle_kt
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| posted on 7/11/12 at 07:47 PM |
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It worked great! And I now have a receipt and £55 heading back to the orange place.
Thanks
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PSpirine
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| posted on 7/11/12 at 08:04 PM |
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I've recovered batteries that were at 0v for weeks, and they eventually worked absolutely fine and lasted years after that.
Equally I've had batteries that drained to 6v for about a day and then could not be saved - it all depends on the state of the internals.
I'd just put it on charge for a few days with an automatic charger (which will trickle/cut-off when charged), then drive around for a while, put
it on charge again. Then use as normal and monitor for a week or so - it'll be quickly obvious if it's not performing well (in which case
it's probably dead permanently).
Halfords return policy is always full of win
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