Doing all the wrong things.

[Diegoboy]

Sitting here charging a lipo in the house, I find two of them (1-3S maxamp & 1-3S Zippy) below minimum voltage. I didn't want to give up on them, so I charged them as Nicad 9-cells @0.5A (ignoring the balance leads) It brought the lipos above minimum voltage. Then I charged them as normal. Any harm in what I did?

[m4a1usr]

Sitting here charging a lipo in the house, I find two of them (1-3S maxamp & 1-3S Zippy) below minimum voltage. I didn't want to give up on them, so I charged them as Nicad 9-cells @0.5A (ignoring the balance leads) It brought the lipos above minimum voltage. Then I charged them as normal. Any harm in what I did?

Maybe. Have you attached a balancer to see where each cell ended up? The packs will only be as good as the worse cell.

John

[Diegoboy]

After the 0.5a Nicad charge, I balanced them and charged them normally (as a lipo) everything seems cool with them...

[Xzessperated]

Danny I rescued a rather expensive 45c Thunder Power pack by charging it as an A123 until the voltage was OK to finish it as a Lipo. I have had at least 8 trips to the lake with it since then. The boat is going faster than ever (because of prop changes) so there appears to be no damage done.
I am not recommending it, just saying it worked for me.

[Diegoboy]

Thanks.
I wish I'd have known this trick sooner, I threw away 2 lipos because of under voltage. I'm glad I gave these 2 a second chance.

[domwilson]

I've read several posts here where guys have done the same thing with success. I've also read that freezing and thawing them and recharging works. So I've tried it on a dead laptop battery that wouldn't charge. It worked.

[ozzie-crawl]

how do they get below voltage in the first place

[marko500]

I used that trick on a Flightmax pack that dropped to about 2.6v per cell. I used it all last season and it still charges, balances, and runs as good as before. Mine dropped that low after I forgot to unplug it and remove it from the boat when I was done Running. I guess the external BEC drew it down that far.

[Diegoboy]

how do they get below voltage in the first place

Ran it till the LVC kicked in and waiting a few weeks to charge it.

[Xzessperated]

how do they get below voltage in the first place

I am not going to tell you he said with a red face.







OK here is another embarrassing moment. I did not set the cut off.

[Diegoboy]

Paddy, I like youe answer better, can I change my answer please??

[Xzessperated]

Paddy, I like youe answer better, can I change my answer please??

Yes change it.

I am not going to tell anyone how many packs I killed this way Danny. Half of them probably could have been saved if I had tried really hard.

[ozzie-crawl]

makes me wonder if iam a bit annul about my battries,i cant afford these days to kill one so i dont run mine till lvc.
when i set a boat up i do the usall short runs and work my way up but also see how much mah i use. i then set the timer on the tx for how long i can safley run before things get to hot or the lvc kicks in.

[Doug Smock]

You can't be too anal when caring for your LiPos IMO.

[ozzie-crawl]

dont want to pinch dannys thread but for the first time my lipos are going to be unused for a few months,acouple of my chargers have storage capability
is this what you guys use,what should the be stored at voltage wise?