Ruined Lipo?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Common Sense RC Support >> Ruined Lipo?
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Ruined Lipo? - 10/26/2007 2:55:40 AM   
clutchbob


 

Posts: 176
Joined: 1/30/2006
From: Waterbury, CT, USA
Status: offline 		I have a cheap balancing charger that I got as a replacement from a recall that Hobby Lobby had with the chargers supplied with the Falcon 3D. I used it to charge a brand new pack of Flight Power Evolite 2500 3s. When I went to check how things were going, I noticed the balancer was very warm. I disconnected the charger and checked the voltages on the individual cells. The outside cells were fine (around 4.17V each), but the middle cell was 4.4V! I ran the pack down a bit and then recharged each cell individually through the balance connector. When I read the voltages after, the outside cells were again, around 4.17V), but now the middle cell reads 4.08v and wont charge any further. It doesn't appear to have puffed, but I'm afraid to use it in my $700 helicopter. Should I continue to use it as long as I watch it closely? I'd hate to think I've ruined this $80 pack. How much can voltage vary between cells before it's a problem?

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RE: Ruined Lipo? - 10/27/2007 5:19:53 AM   
mrasmm


 

Posts: 4422
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		no idea on that one. You're definately very close to the limit if you were at 4.4v. you might try cycling it a few times on a charger/discharger in a controlled condition where it can puff or explode or whatever and see what it does.

A good lesson learned, if you bought something like a cellpro, then you'd have a nice charger, and you wouldn't have all the headache, and your 700 chopper wouldn't be at risk, and you'd not have a q on your pack =)

It's not as much of the voltages carying, that doesn't actually hurt the pack, it's over charging or discharging the pack because the cells are out of balance that hurts them. The cut off for lipo damage is supposedly 4.3v per cell, but I dunno how far you can push it. Best of luck to ya!

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RE: Ruined Lipo? - 10/30/2007 3:10:18 AM   
clutchbob


 

Posts: 176
Joined: 1/30/2006
From: Waterbury, CT, USA
Status: offline 		I gotta agree these batteries are too expensive to chance w/ cheap chargers/ balancers. I'll continue to use this pack, carefully.

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Suffering joyfully

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RE: Ruined Lipo? - 10/30/2007 8:51:04 AM   
mrasmm


 

Posts: 4422
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		sounds good =)

good luck =)

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       Post #: 4

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Common Sense RC Support >> Ruined Lipo?
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