 Re: One battery has a higher charge than the other.
What charger are you using? On the new 2150s The difference you are seeing is most likely due to variation of the safety circuit. Charger is designed to stop the charge at 8.25-8.3, Circuits are designed to cut off charging at 8.4 in case charger didn't stop the charge in time. There is almost always a variation in these circuit, most of the time is not the cell. And to specifically answer your question on the cells, they have not changed in chemistry or productions! Same exact ones as used to be. 2 2150 on 50cc and even 2.4 is a great set up. Better way of checking to see how much more one battery is used during a flight than other would be charging both batteries to full with a charger that shows the capacity and see how much one takes to charge vs. other. I have never had a Battshare but there is always a small variation in electronic circuit that can cause one battery to discharge 50-100 mah more than the other per flight!
I think you are perfectly fine but Jack would be more than happy to speak with you if you want to call him.
Reza
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