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Old 01-09-2012, 06:28 AM #1
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Default Rescuing IMR10440?

Hey everyone -

A while back I bought two IMR10440s. They can handle ridiculously high discharge rates. All fine and dandy. However, I realized that one of them managed to drop to 1.6V or so, which I know is far below the safe operating voltage of li-ions.

However, I read somewhere that I could rescue li-ions? It wasn't a cheap battery, and may as well save it if I can, so what's the method? Trickle-charge until ~3.3V or something? I can't seem to find where I read about rescuing them.


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Old 01-09-2012, 10:27 AM #2
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Default Re: Rescuing IMR10440?

Some chargers have a recycle mode. They can revive a death battery. Basically the battery is going to discharge and recharge several times. You can do it manually by discharge it with a load and recharge it again for a few cycles. Hopefully the battery will come to live or else it is going to the recycle box.
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Old 01-09-2012, 03:34 PM #3
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Default Re: Rescuing IMR10440?

So how would I do this manually? Trickle charge it till it's at like 3.3V, then discharge down to 3V, then rinse and repeat?
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Old 01-09-2012, 04:37 PM #4
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Default Re: Rescuing IMR10440?

I've never had to do it myself but trickle charging works on normal Li-ion (LiCo) at least.
Haven't read if it works on IMR LiMn but it worth a shot. On LiCo you have to bypass the protection PCB if it has one.
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Last edited by HaloBlu; 01-09-2012 at 04:45 PM.
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Old 01-09-2012, 04:43 PM #5
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Default Re: Rescuing IMR10440?

Alright. Well then! When I get back to my dorm I'll try it out. But if it explodes, its YOUR FAULT! XD
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Old 01-09-2012, 05:01 PM #6
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Default Re: Rescuing IMR10440?

No, no, no, no,no no,no... I disavow all responsibility for any fire, explosion, destruction, maiming, disfigurement, coma, death & annoyance if it doesn't work.
I would trickle charge them Very slow anyway. Inside a Lipo firesafe bag. In a metal box. Buried a foot underground. Seriously, everyone should have at least a cheap Lipo bag.

Where are your IMR10440 from? BestInOne sells inexpensive ones that test very well.
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Old 01-09-2012, 05:57 PM #7
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Default Re: Rescuing IMR10440?

Quote:
Originally Posted by HaloBlu View Post
Where are your IMR10440 from? BestInOne sells inexpensive ones that test very well.
Eeek, no. All of their IMRs, EXCEPT FOR the 10440s, are supposed to test well. See:
Bestinone.net IMR batteries current measurements - comment re 10440s
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Last edited by rhd; 01-09-2012 at 05:57 PM.
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Old 01-09-2012, 09:23 PM #8
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Default Re: Rescuing IMR10440?

I was kidding Bluefan :P

But mine are from AvidVaper - they are the only source I could find for cheapish IMR 10440s. And how slowly? And will there be any precursors like heating up or something if they are about to go critical (haha)?
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Old 01-11-2012, 08:34 AM #9
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Default Re: Rescuing IMR10440?

guessing your charger doesn't recognize them that low?

Ive resurrected highly discharged Lithium cells by bringing them up to voltage on a Variable Power Supply on like 0.1C

Keep an eye on them temperature wise!

Hope they live.

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Old 01-11-2012, 03:32 PM #10
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Default Re: Rescuing IMR10440?

I didn't want to risk shovin' em in my charger. So I will try charging them today ^_^
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Old 01-12-2012, 02:33 AM #11
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Default Re: Rescuing IMR10440?

Quote:
Originally Posted by rhd View Post
Eeek, no. All of their IMRs, EXCEPT FOR the 10440s, are supposed to test well. See:
Bestinone.net IMR batteries current measurements - comment re 10440s
Sorry. Thanks Rhd for the quick correction & preventing me from leading anyone astray.
*edit* Hate the "spread some Reputation around" message.

Had plans that really need a good IMR LiMn 10440. If anyone runs into some that test well, do share please.
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Last edited by HaloBlu; 01-12-2012 at 02:53 AM.
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Old 01-12-2012, 02:55 AM #12
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Default Re: Rescuing IMR10440?

So good news! I started trickle-charging this battery, and I think I rescued it! I trickled it at about 10-15mA of current inward and now it's sitting at 2.8V (I had to go to class, and didn't want to leave it unattended). Now I just need to finish trickling it and then draining it and repeat!
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