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Old 08-03-2005, 08:34 AM   #1
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Default OMG I charged my stick pack the wrong way!

Help me....

I carelessly charged my 3000mah Nimh stick pack the wrong direction at 3A.... and it became -3.5v

Then tried boosting it back the other way using 5A... now the voltage hovers around 6v at full charge.

Is there anything i can do to SAVE it??
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Old 08-03-2005, 08:41 AM   #2
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not really sure...I would think you should have blow the fuse in your charger before it allowed you to charge a pack in reverse....

I'd check your fuses on the charger and go from there...

But I wouldn't hold my breath on that pack every being good again
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Old 08-03-2005, 08:43 AM   #3
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Quote:
Originally Posted by Dragon
Help me....

I carelessly charged my 3000mah Nimh stick pack the wrong direction at 3A.... and it became -3.5v

Then tried boosting it back the other way using 5A... now the voltage hovers around 6v at full charge.

Is there anything i can do to SAVE it??
OOhhh....!!!
Why like that?!?!
Haiz...Gone-ed...
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Old 08-03-2005, 08:44 AM   #4
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it was left on the shelf for like quite a few months, so it was like completely discharged.... guess the charger couldnt tell the difference...

dam sad man... i paid like $80 for that a long time ago... hope i can save it somehow...
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Old 08-03-2005, 01:17 PM   #5
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I heard of a battery ZAPPER that can 'zap' batteries back to life... anyone heard of such a thing before?
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Old 08-03-2005, 02:03 PM   #6
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You could have your cells zapped, but I don't think it's probably worth it for an unmatched stick pack. Plug your pack in and try run it. If it works a bit, maybe you'll limp by for a while.

Otherwise, just chalk this one up to experience and pick up a new battery pack.
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Old 08-03-2005, 02:40 PM   #7
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I don't understand how you could charge it backwards... what kind of connectors do you have on the stick pack?

Deans or tamyia connectors don't go in backwards and I don't think you're hardwiring a stick pack... so tell us the truth... did you reeeeeeeaaaallllllly charge it backwards ????
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Old 08-03-2005, 03:56 PM   #8
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I find thid very weird ... what charger do u have? the pack must been really discharged...

Anyways, this seems some what close to what happens when u reverse a cell. If this is the case, some people had some good results charging cell by cell, at high voltages (like 3 to 9 volts for a single cell).

When i say good results, i mean somewhat decent... dont expect much for a batterie that suffered this kind of damage.
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Old 08-04-2005, 01:59 AM   #9
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yes i really did... i prob left it on the shelf like more than a year.... the stick packs were like 0v.... maybe the charger couldnt tell the difference which way was it...
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Old 08-04-2005, 03:03 AM   #10
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Quote:
Originally Posted by Dragon
yes i really did... i prob left it on the shelf like more than a year.... the stick packs were like 0v.... maybe the charger couldnt tell the difference which way was it...
neither blame the charger nor you,

I guess you do hard wiring or use banana plug connector on that battery,
yes you might got trouble with that hardware..
the risk become worse as you seldom charge baattery, then may occurs kind of "mind glitching" which terminal is (+) which is (-)..

I dunno how to recover your batt.. sorry..
I just suggest use deans plug or at least tamiya connector (as tc3blue comment..) on the rest of your undamaged pack..
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Old 08-04-2005, 04:48 AM   #11
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I just remembered, the method of charging with high voltage was for nicad's. dont know if its ok for nimh. but i guess that if the pack is dead u can try it anyways...

The ideia is to disassemble the pack and give to each cel a high voltage. u can do that with a simple ac/dc. But i repeat: i have no idea what the result in nimh!

Good luck!
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Old 08-04-2005, 06:58 AM   #12
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Quote:
Originally Posted by handyrandyrc
You could have your cells zapped, but I don't think it's probably worth it for an unmatched stick pack. Plug your pack in and try run it. If it works a bit, maybe you'll limp by for a while.

Otherwise, just chalk this one up to experience and pick up a new battery pack.
fyi, you can buy matched stick packs, and if he paid 80 bucks for a stick pack i hope it was matched.
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Old 08-04-2005, 08:47 AM   #13
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I have done this once, what I did was.....

With the cells reversed I discharged the pack down to 0.0 volts on a set of lightbulbs. and deadshorted them... let them set for a week deadshorted.... then hit them with a good 5 amp charge. Mine came right back and ran very well almost as long as the other packs I had at the time.....


I don't know but i would think that if you discharge them and deadshort them now it should be alright...
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Old 08-04-2005, 08:59 AM   #14
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this seems a nice ideia... u can discharge them all time u want without being afraid of reversing the cells... after all they are already reversed !

Seriously: I dont know what good will it do to short the battery, but by reducing the cell voltage to 0 volt, u should get it ready to accept the next charge with the right polarity.

Good luck!
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Old 08-04-2005, 10:09 AM   #15
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hmm what do u mean by dead shorting? how do i do that?
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