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« on: May 28, 2016, 02:22:26 PM »
Prasad Dsa
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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.
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« Reply #1 on: May 28, 2016, 02:35:57 PM »
kiran rc
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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.
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« Reply #2 on: May 28, 2016, 04:42:38 PM »
Voice of deaf
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The cell is facing fierce voltage sag. Try to change cell .
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« Reply #3 on: May 28, 2016, 04:54:34 PM »
SK1701
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set acc_hardware = 1
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.
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« Reply #4 on: May 28, 2016, 07:45:34 PM »
aditya
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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.
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« Reply #5 on: May 28, 2016, 08:23:51 PM »
Voice of deaf
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Yeah its very dangerous task to desolder and resolder the new lipo cell
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« Reply #6 on: May 29, 2016, 06:19:16 PM »
Prasad Dsa
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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.
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« Reply #7 on: May 29, 2016, 07:03:09 PM »
Voice of deaf
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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.
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RC India  RC Equipments  Batteries and Chargers  Topic: Help with balance charging my lipo and battery issue
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