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Title: lipo readings Post by: Darshan for multirotors on June 27, 2015, 12:26:19 PM hey guys
i had a question i have a 3s lipo [1500mAh]and a imax b3ac and i always had a problem with it the two cells would turn green but the last cell always used to stay red ... disconnected and connected again but doesnt work... the charger get hot for the first 2 cells and then it cools down when the 2 are charged So, finally i went to a local shop and bought myself a multimeter the cells reading after full charging[apparently 2 cells green and 1 cell red] cell 1:- 418 cell 2:- 424 cell 3:- 407[the red cell] total:- 12.49 the total cell rating should be 12.6 after charging right so using this 12.49 is okay cause the charger just stops charging :banghead: :help: :-\ :help: Title: Re: lipo readings Post by: Swapnil on June 27, 2015, 01:35:46 PM Clearly the LiPo pack is unbalanced. Only a slight variation in the second decimal is okay. That is, 4.18-4.19-4.18 would be considered okay for a 3-cell pack. Try balancing the pack. If that doesn't work, it would be wise to dispose of the pack.
Secondly, the pack must charge to 12.6V if it isn't too old. The problem could be with the battery or the charger. I had a similar charger to yours which couldn't charge to 12.6V either. I got an Imax B6 and have never had any charging problems since. Title: Re: lipo readings Post by: liakhat on June 27, 2015, 02:29:09 PM Hi Watch this Video this might be helpfully
https://www.youtube.com/watch?v=wIbHLacozFo Title: Re: lipo readings Post by: Shyam Hembram on September 15, 2015, 03:00:30 AM hii have you figured out the problem.is it charger or the battery.i too am having same problem. two of my lipos got same problem. one led remains red.using b3 charger
Title: Re: lipo readings Post by: Darshan for multirotors on September 15, 2015, 06:26:43 AM Shyam, that charger is hopeless and does not balance charge so it might spoil your battery
Please buy a b6ac or some other Title: Re: lipo readings Post by: Swapnil on September 15, 2015, 08:39:30 AM Yes, the B6 costs more but will never give you headaches like the B3 does. Think of it as a long term investment.
Title: Re: lipo readings Post by: Sreeraj on September 15, 2015, 10:42:34 AM Regular LiPo batteries with nominal Voltage of 3.7V should not be charged greater than 4.2V.
Going above 4.2V to 4.3/4.35V is HVLipo territory. THIS SHOULD NOT BE ATTEMPTED ON REGULAR Lipos!!!! The overall chemistry of the HVLipo is different compared to the regulars. Plus even your average charger has a cut of limit of 4.2V, meaning it cannot charge beyond 4.2V. If your regular XYZ charger is able to charge beyond 4.2V, it means the charger is faulty. I agree with Swapnil, right investment on a charging station will go a long long way! Cheers, Sree! Title: Re: Post by: Shyam Hembram on September 15, 2015, 04:27:07 PM Cell no 1 in both of my batteries remains about 3.7 it doesnt cross 4v. I hope the batteries are good and must worry about the charger. Right!!!
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