Andythecrane Posted January 2, 2015 Share Posted January 2, 2015 Hi everybody, Charged my batteries yesterday waiting for a break in the weather. Gens Ace 2S 5300mah. Fitted them to the Sabertooth today and the car was pulsing on the throttle. After doing some checks, i stuck a voltage meter across the plug and one of the batteries read 2.7v and the other read 3.9v. Took the batteries to the charger and the low battery would not charge. My question is; has the battery died on me, and what do i do next? Thanks ANDY Quote Link to comment Share on other sites More sharing options...
DannyP Posted January 2, 2015 Share Posted January 2, 2015 I have saved a couple of LiPo's like that. Put it on a Nimh charge for a minute or so and it should bring the voltage back up enough to do a LiPo charge. If it's an old pack, give it a salty water bath for a week outside and bin it Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 The batteries are fairly new. Once the other pack comes off the charger I will give that a quick go.. Is it one of those things, that a battery can die, or could I have done something wrong? Sent from my Nexus 4 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Vr5fx Posted January 2, 2015 Share Posted January 2, 2015 NiMH charge at your own risk. 0.5a NiMH for a few minutes to tip it over 3v, then do a LiPo balance charge at 1a. (It will take hours, but it should slowly bring the low cell back up) Keep an eye on it, if anything bothers you, stop charging and put it outside. Regarding disposal, you need to discharge all cells before putting in a salt bath for safe disposal. Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 OK chaps, I have for one minute put it on a NiMH at 1amp. Now on lipo balance at 1 amp. In a charge bag as well.. Sent from my Nexus 4 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tug Posted January 2, 2015 Share Posted January 2, 2015 It happens, luck of the draw. If they're that new, I would go for a warranty. Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 No warranty. Bought them from a friend. So luck of the draw. Sent from my Nexus 4 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Vr5fx Posted January 2, 2015 Share Posted January 2, 2015 Personally, I've had awful experience with Gens Ace, will never buy them again. How do the cells look at the moment? Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 On a 1 amp lipo balance charge. Showing after 35 minutes, 3.79 & 3.80 Cool to the touch and no swelling. Sent from my Nexus 4 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Vr5fx Posted January 2, 2015 Share Posted January 2, 2015 Go back to a normal charge rate (5.3a, or w/e) Then check cells once charge has finished. Let it sit for an hour or so and recheck cells, if one has dropped you have a bad pack. 1 Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 OK. Now on a normal balance charge. Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 Ok chaps, The battery has completed a balance cycle. Both cells reading 4.20v. left them standing disconnected for about 45 minutes to an hour, and the cells read 4.17v and 4,18v. Your thoughts please ? Quote Link to comment Share on other sites More sharing options...
Tug Posted January 2, 2015 Share Posted January 2, 2015 Leave a little longer and re-test. 2.8 is the bare minimum, 2.7 is the point at which a chemical reaction takes place and the cell is non-recoverable. Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted January 2, 2015 Share Posted January 2, 2015 discharge batterys that are dead or knackered. 2lb of salt to a gallon of water and pop the batterys in. this eats the cathode and anode tabs away and renders the battery unable to be shorted BUT !!!! and please take note.. there is still a charge in that pack, the only safe way to fully discharge is to break the battery, ie puncture it right through, but this will still react with puffing and smoke, just not as aggressive as a none discharged and bathed battery. i have a couple 2s batterys 1300mah both show a dead second cell, one reads .9v the other reads 1.8v the two other cells sit at 3.8v respective, but are stored inside my ammo bunker 1 Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 2, 2015 Author Share Posted January 2, 2015 i Have the battery in a lipo safe just now. and i will check it again in a few hours and in the morning. And decide from there. Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 3, 2015 Author Share Posted January 3, 2015 UPDATE: I have checked the voltages of the offending battery this morning. And it read 4.16v and 4.19v. The other battery is reading 4.20v and 4.20v. Is the conclusion i have a dodgy cell within the battery? Quote Link to comment Share on other sites More sharing options...
b19jas Posted January 3, 2015 Share Posted January 3, 2015 I have a nano tech that does the same thing in my Merv. Still been using it for about 6 months and had no issues, but then again the Merv doesn't put a lot of stress on lipos. Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 3, 2015 Author Share Posted January 3, 2015 I dont have a lot of lipo experience. And i dont want to have a fire either. I will probably buy a new battery soon, and safely dispose of the iffy one. Quote Link to comment Share on other sites More sharing options...
mattr Posted January 3, 2015 Share Posted January 3, 2015 I'd just run it a few times, a few charge/discharge cycles will give you a better handle on what's going on. Set the lvc quite high then check voltages. 1 Quote Link to comment Share on other sites More sharing options...
Deafty Posted January 3, 2015 Share Posted January 3, 2015 I would use the word weak rather than dodgy. If you have any concerns don't use it. If it were me I'd run another pack with a high LVC and check again. Effectively your pack is weak compared to the other one but it is likely still useable, just keep an eye on it 1 Quote Link to comment Share on other sites More sharing options...
Tug Posted January 3, 2015 Share Posted January 3, 2015 I'd use it, that's weak, but not dead. 1 Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 3, 2015 Author Share Posted January 3, 2015 I have tried to balance charged the weak battery before i went out, but it would not finish the cycle. It stayed at 4.19v forever. I have now ran them them in the Sabertooth right down to the cut off, set at 3.8v. Put it back on the charger, and it read 3.79v on both cells. Hopefully it will reach to the end of the cycle. Quote Link to comment Share on other sites More sharing options...
Deafty Posted January 3, 2015 Share Posted January 3, 2015 What charger are u using? Quote Link to comment Share on other sites More sharing options...
Andythecrane Posted January 3, 2015 Author Share Posted January 3, 2015 Overlander 7 amp Sent from my Nexus 4 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted January 3, 2015 Share Posted January 3, 2015 yep weak cells. thats the luck of the draw with lipo tech, some preform way out of there repected limit where others just dont get that far. i would go with deafty , weak cells, use but with care and no uber loading 1 Quote Link to comment Share on other sites More sharing options...
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