reviving a Lion?

[Toiler]

I accidentally ran a li-ion battery completely flat and now it won't charge. Is there any way to revive it?

Regards, toiler

[Bob Minchin]

Nope, even if you could get is to take charge, the capacity would minimal. Li Ion need strict managagement both in terms of voltage and current during charge and discharge. Play by it's rules and they are very good. The better packs have management built in and give very good service.

[Dave Liquorice]

I think all Li batteries have bulit in management because they are so fussy and over charging/heating can be a bit exciting.

I'd leave it connected to the powered up charger for a 48 hours and see if that provokes the management into working properly, it quite often does.

[The Medway Handyman]

Be very careful when doing the chest compressions.....

[PeterC]

Same applies to Angelina Jolie.

[Grimly Curmudgeon]

Very carefully, using a single-cell charger and do one at a time, and never leave it in the house unattended. Depending on the exact type of cell, there are different voltages to be attained. In general, it's probably toast and I never attempt to recharge one that's dropped below 2.5V or so (indeed, the last lot of ex-laptop batteries I stripped for cells, any under 2.8V were binned).

[The Natural Philosopher]

ve never ever successfully recovered a single cell. Gave up trying.

[MM]

And I thought you were going to talk about a Lion Bar and there's me wondering, did they stop making it? 'Twas my favourite choccy bar in the 1980s.

MM

[Martin Brown]

It is doable sometimes but not worth the risk since you have to dismantle and defeat the battery failed self immolation protection. Li-ion cells are very unforgiving as Boeing and Sony will testify.

The battery packs are designed to fail safe wrt overheating and other forms of abuse. Once bricked they are not reliable or safe.

[Road_Hog]

Tis a favourite of the other half and I can confirm that it is still on sale, but not in supermarkets etc. You have to find it in newsagents/corner shops.