I bought 10 2400mAh 18650 cells from ebay and i run 3 xml from 3P3S.
From fully charged batteries(4.07) after only 15 minutes burn time the voltage drops as low as 3.54 while in use, but if i turn it off the voltage per cell goes up to 3.7, and after a while it shows even close to 3.9, in the next cycle it gets to 3.5 in 5-7 minutes, then after 5..
Is it safe for the cells to run it if it shows less than 3.5-3.3 while running?
Batteries from hobbyking.com are high-quality? or "ebay-quality"? I suspect that my batteries are nowhere near 2400mAh.