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Title: Help with balance charging my lipo and battery issue Post by: Prasad Dsa on May 28, 2016, 02:22:26 PM I have a 2s 7.4v 1000mah battery with this motor, http://www.rcbazaar.com/product.aspx?productid=4089 . I put 6x4 prop on it. It used to work fine. But last week i saw saw that the battery was charged full at 8.2v and when i handlaunched the plane at 80% throttle the low voltage buzzer started beeping and the motor stopped spinning and the plane crashed but when i reduced the throttle to zero it stopped beeping. What caused the sudden drop in voltage?.I charged the battery with this charger http://www.rcbazaar.com/product.aspx?productid=992again and all lights turned green on it but when i connected the buzzer i saw that one cell had 4.18 and the other was at 4.0.
i connected the motor again and gave only 15%throttle and i saw that only the 1st cell was losing charge and the other was stuck at4.18. Please help. What can i do to make it run normal again and balance charge it with the charger i have. Please help. Title: Re: Help with balance charging my lipo and battery issue Post by: kiran rc on May 28, 2016, 02:35:57 PM Can you test the cell which is 'losing charge' for a while and the post the results here?(For eg.,Voltage drop)
The problem can be either battery, esc or with the low voltage alarm. Title: Re: Help with balance charging my lipo and battery issue Post by: Voice of deaf on May 28, 2016, 04:42:38 PM The cell is facing fierce voltage sag. Try to change cell .
Title: Re: Help with balance charging my lipo and battery issue Post by: SK1701 on May 28, 2016, 04:54:34 PM Is it a Wolfpack LiPo? I had one cell go bad on a 3S 2200 mAh pack. It would sag very low (below 3V) when any load was applied. I removed the cell to make a 2S pack I use with my FPV goggles. However, dismantling/ modifying LiPos can be very dangerous and I would not advise it unless you are very confident of your skills.
Title: Re: Help with balance charging my lipo and battery issue Post by: aditya on May 28, 2016, 07:45:34 PM The cell losing voltage gone bad. It is not balancing problem.Try replacing battery with good battery before it do more damage to your plane.
Title: Re: Help with balance charging my lipo and battery issue Post by: Voice of deaf on May 28, 2016, 08:23:51 PM Yeah its very dangerous task to desolder and resolder the new lipo cell
Title: Re: Help with balance charging my lipo and battery issue Post by: Prasad Dsa on May 29, 2016, 06:19:16 PM it is a Wolfpack lipo. So there is no way to save my lipo? and should buy a new one? please suggest a good company lipo that will not give me such problem.
Title: Re: Help with balance charging my lipo and battery issue Post by: Voice of deaf on May 29, 2016, 07:03:09 PM The wolfpack specs are bloated. Especially the c rating .
IMHO For normal plane flying any good lipo is enough. But personally i try to stay away from nano techs and wolfpacks. Go for bonka, tattu or dinogy for high perfomance. |