Hello all. I had a unusual event today. I have two 6s batteries connected in parallel on my quad. They are both 16000 mah batteries rated at 15c. After the flight I let them rest and then put them on my charger. When the charge was complete i was astounded with the results. The batteries were disporportunately discharged during the flight. One battery took 8000 mah and the other took 15000 mah to charge them back up. I have not experienced this before. Can anyone explain this and give me an idea how to correct this problem?Thanks in advanceWill
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I hope the charger had a bad day. I use anti spark plugs for the very reason of reducing spark when connecting the batteries. I am trying to come up with a reliable way of logging power consumption of the batteries and I do not trust mission planner. The connections between both batteries are consistanT in size and length. upon inspection the plugs look to be in good condition. This is the first time that I have had this problem and I am concerned with damaging one of the batteries. Do you have a reliable solution to measure mah usage? I have considered getting balance port meters but was not sure if they would be reliable enough.
Well I found the problem to be that the charger stopped mid charge. I restarted the charger and it finished within a couple mah of the other one. It doesn't give me warm and fuzzies for it to do this.
some chargers hav a mAh limit....which annoyingly in the case of my multiplex charger can't be changed.....it assumes a limit based on the current set, and assumes you are charging at 1c.
Check for a capacity limit maybe.
I also use batteries in parallel and try to keep the batteries in pairs always using the same batteries together. There is normally some difference though, particularly on my older batteries.
William Cox > Stuart BrookesApril 4, 2015 at 7:16am
In my case (I don't have a clue, lol) I have a four station battery charger. I plug one battery in to one port. I guess everything is entitled to an error or two.
At this point with these batteries it is a moot point. if you follow one of my other discussions this heavy quad crashed. I'm going through each piece to see which is salvageable and what I need to start over with. The batteries are definitely toast. Each of them have a nice arc to them. And a puncture or two.
Replies
I hope the charger had a bad day. I use anti spark plugs for the very reason of reducing spark when connecting the batteries. I am trying to come up with a reliable way of logging power consumption of the batteries and I do not trust mission planner. The connections between both batteries are consistanT in size and length. upon inspection the plugs look to be in good condition. This is the first time that I have had this problem and I am concerned with damaging one of the batteries. Do you have a reliable solution to measure mah usage? I have considered getting balance port meters but was not sure if they would be reliable enough.
Will
Thanks for the hell anyway.
Will
some chargers hav a mAh limit....which annoyingly in the case of my multiplex charger can't be changed.....it assumes a limit based on the current set, and assumes you are charging at 1c.
Check for a capacity limit maybe.
I also use batteries in parallel and try to keep the batteries in pairs always using the same batteries together. There is normally some difference though, particularly on my older batteries.
At this point with these batteries it is a moot point. if you follow one of my other discussions this heavy quad crashed. I'm going through each piece to see which is salvageable and what I need to start over with. The batteries are definitely toast. Each of them have a nice arc to them. And a puncture or two.
Will
ah sorry to hear that