Re: Reviving dead car battery. How?
- From: "Paul E. Schoen" <pstech@xxxxxxxxx>
- Date: Mon, 17 Sep 2007 01:58:51 -0400
"Jon Slaughter" <Jon_Slaughter@xxxxxxxxxxx> wrote in message
news:XWmHi.3334$Sd4.3206@xxxxxxxxxxxxxxxxxxxxxxx
"harore" <mohdwahidi@xxxxxxxxx> wrote in message
news:1189995266.938402.305520@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Helloo..
By theory, the car battery can be assumed dead when it can hold
anymore charge right? But my car battery happens to have the charge
below than 12 hours meaning that I need to jumpstart it every morning.
Then, the battery runs fine all day long. I need your guys(gals)
advice on this. I can buy a new one but if I can still use it, why
not? Also, I don't want to throw the battery as this will pollute the
environment. Hope this post is related to basic electronics.
Are you 100% sure its the battery? Its possible its the alternator.
Also you can try to put water in the battery. Sometimes when it gets
extremely hot it can evaporate the water. (technically there is an
electrolyte in there but the water will evaporate before the sulfuric
acid...) Adding a little water is a quick way if thats what it needs. If
its an extremely old batter or one that has not be used for several
months then the batter itself is pretty good but chances are you can't
fix it yourself(if you could you wouldn't be asking this question).
I got a little more life out of a battery once, by carefully draining all
the electrolyte (sulphuric acid), then washing out the cells with a
powerful spray from a hose (had to be really careful to avoid burns). There
was some sediment in some of the cells that may have caused loss of charge.
Once I had it cleaned out, I replaced the electrolyte (through a filter),
to just over the plates, and then I put it on a long charge. I found some
of the cells charged better than others (by measuring specific gravity), so
I had to play around with adding water or more acid and charging some more
until the cells were about even. But it was a lot of work, potentially
dangerous, and it only lasted another month or so.
Recently I got a perfectly good battery (for my spare car) at a junkyard
for about $10. Otherwise a new one is worth the investment of about $60,
and it should be fine for 3 years if the electrical system is OK. A
voltmeter is often best to measure charging with the motor running (about
13.8 to 14.4 V), and 12.5 to 13.2 V before starting. You can detect bad
connections by reading voltage drop from battery terminals to the engine
frame and the starter when cranking, and the battery voltage when cranking
should be at least 10 volts or so. You can also detect weak batteries or
bad connections by reading voltage with headlights on.
Good luck,
Paul
.
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- From: harore
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