Re: charging a fully discharged car lead acid battery


"Veggie" <nospam@xxxxxxxxx> wrote in message
news:jMX2f.533$tV6.198@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I have a car with a battery that is completely discharged (accessory
> left on for over 24 hours). Read 0 volts.
>
> What is the best way to remedy this?
>
> a) jump start - it seems to not be a good option as it dumps high
> current into the dead battery. If you're on the road somewhere, sure,
> you need to get going but jump starting seems to be undesirable.
>
> b) put it on a battery charger, one of those 5/10/25 amp ones. If so,
> which rate is the best for a completely flat battery?
>
> There seems to be a lot said about sulfate build up on batteries. It
> seems to be an unsettled subject on the Net, as many say one thing but
> an equal number refute it. One claim in interesting to me- that leaving
> a lead acid battery in flat condition for a long time caused sulfate
> build up. Is this true, and what is a "long time"? Are we talking
> days, weeks, or months?

Do either, the battery will never be the same again, but if you just stick
it on the charger on the normal setting or jump start the car and drive it
for a half hour or so then it might work for a bit.

Sulfate will build up very quickly, hours to days, after months it'll be
very heavily sulfated.


.

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