Possible to revive a corona'd battery?

[fiju]

I haven't driven my car in 6 months and the battery is dead. I jumped it and took it for a long drive, after switching it off it wouldn't even crank again.

I've bought one of these battery chargers:
https://www.ebay.co.uk/itm/12V-10A-Connect-and-For...

I'm hoping that leaving it plugged in a for a week may sort it out. Has anyone got experience with this sort of thing?

[Olivergt]

A few questions:

How old is it? If it's 5-6 years or more, I would be inclined to just get a new one.

Can you check the electrolyte level? i.e does it have 6 little caps on top that you can unscrew, if so, take a look, make sure the liquid is above the plates, if it isn't, top it up.

The battery charger may revive it, but given that you took it for a long drive and it wouldn't even crank over, that does sound like it is toast.

[abzmike]

fiju said:

I haven't driven my car in 6 months and the battery is dead. I jumped it and took it for a long drive, after switching it off it wouldn't even crank again.

I've bought one of these battery chargers:
https://www.ebay.co.uk/itm/12V-10A-Connect-and-For...

I'm hoping that leaving it plugged in a for a week may sort it out. Has anyone got experience with this sort of thing?

So the battery had charge to get you started but died afterwards? More of an alternator problem maybe?

[spikeyhead]

Don't leave a 10A charger on a battery for any length of time

[fiju]

Olivergt said:

A few questions:

How old is it? If it's 5-6 years or more, I would be inclined to just get a new one.

Can you check the electrolyte level? i.e does it have 6 little caps on top that you can unscrew, if so, take a look, make sure the liquid is above the plates, if it isn't, top it up.

The battery charger may revive it, but given that you took it for a long drive and it wouldn't even crank over, that does sound like it is toast.

I don't think it's that old.

Unsure, I haven't removed it.

But that's basically what my question is...

[Mort7]

I would have bought a CTEK charger. Similar price and they have a desulphation setting.

As recommended above.

Before you go any further check the electrolyte level and top up each cell with ionised water if it is below recommended levels. There are often markers above the plates to indicate the correct level. If not then ensure the plates are covered but do not overfill.

Then put the battery on charge until you get to float charge level, and try starting again. Don't just leave it for a week. If it starts then all is well, if not then a new battery may be required.

Did the ignition light show when running the car. If so then alternator may be fubar.

[GreenV8S]

You don't mention the battery voltage. That would tell you a lot about the state of the battery. Quite likely it has been dead since the original jump start and whatever else you're doing is a waste of time, but knowing the voltage would make that a lot clearer.

[stinkyspanner]

I had similar, my car has an AGM battery and was totally dead, no dash lights or anything. It wouldn't even go with a jump start.. anyway bought a charger with a recovery mode and having read up I didn't have much hope that it could ever recover but sure enough I went through the motions and it's good as gold now..

[LimSlip]

Leaving a battery fully discharged for even quite short durations will damage it, after 6 months I wouldn't hold out much hope of it being useable.

[Baldchap]

You might be able to get it to accept charge by hooking it up to another (good) battery for a day or two, this seems to get them accepting charge again, but typically unless it's a real snotter or you're selling, the new battery is the way to go that won't leave you stranded.