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

Regards,
toiler

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

Regards,
toiler

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.

On Thu, 24 Oct 2013 17:47:50 +0100, Bob Minchin wrote:

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

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.

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.

--
Cheers
Dave.

On 24/10/2013 17:44, Toiler wrote:

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

--
Dave - The Medway Handyman www.medwayhandyman.co.uk

On Thu, 24 Oct 2013 18:53:21 +0100, The Medway Handyman wrote:

On 24/10/2013 17:44, Toiler wrote:

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

Same applies to Angelina Jolie.
--
Peter.
The gods will stay away
whilst religions hold sway

On Thu, 24 Oct 2013 17:44:01 +0100, Toiler
wrote:

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

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).

On 28/10/13 18:54, Grimly Curmudgeon wrote:
On Thu, 24 Oct 2013 17:44:01 +0100, Toiler
wrote:

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

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).

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


--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

On Mon, 28 Oct 2013 18:54:18 +0000, Grimly Curmudgeon
wrote:

On Thu, 24 Oct 2013 17:44:01 +0100, Toiler
wrote:

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

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).

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

On 28/10/2013 19:45, The Natural Philosopher wrote:
On 28/10/13 18:54, Grimly Curmudgeon wrote:
On Thu, 24 Oct 2013 17:44:01 +0100, Toiler
wrote:

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

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).

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

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.

--
Regards,
Martin Brown

On Tuesday, October 29, 2013 7:17:51 AM UTC, MM wrote:
On Mon, 28 Oct 2013 18:54:18 +0000, Grimly Curmudgeon

wrote:



On Thu, 24 Oct 2013 17:44:01 +0100, Toiler

wrote:



I accidentally ran a li-ion battery completely flat and now it won't

charge. Is there any way to revive it?



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).



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

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.