Originally Posted by
jethro56
Just got them today so i'm an Instant Expert. From what I've researched the main problem is when charging. Especially the first three times.The Hperion 1420i is pretty advanced and watches for overvoltage which is the main cause of fire. A full charge is 4.2 V/cell.I charged them to 90% capacity or around 4.13V. Another problem is over discharge. I Plan to stay above 30% until I get a Low voltage cutoff system that is ordered but not shipped. Some very serious people seem to think this charger solves the overcharge problems by allowing charges to slightly lower voltage. I have 10AH/12s and have ordered another 10aH/12s I don't know if I'll buy another LVC depend on how much trouble it'll be.
Yep, you've got it. Problems start occuring when cells reach 4.30V/cell. 4.15V/cell is a safe setpoint, that's what we've been using for thousands of cycles with no issues at all. Charging in a metal, or other fireproof box is always a good idea, however.
Discharging to 80% DOD is a safe bet for maximum life expectancy of the cells. Also, when discharging to 80% cells will almost always remain self-balanced, meaning there's a rare need for balancing. Problems occur when cells are very far out of balance and reverse their polarity, 80% DOD gives plenty of headroom to avoid this. For 12s packs, 42.0V is a good general LVC for ESC's that typically cuts off discharge around 80% DOD.
Have fun!
Tommy