bought one 24s lifepo4 (the very exact same one like in the 1st post except it's not lipo but lifepo4).
had some good conversation with henry, and even tough they didn't send the tracking# as requested it arrived within a week.
connected it to my battery, and charger and startet charging. no fire, no flash, no bang. that's a good sign
my charger is set to 86.4v end voltage, and starts to lower current afair somewhere near 84v.
the whole pack is about 50mv out of balance when the first cells reach 3.6v, and the bms is fully balancing at that time. the backside of it (the side w/o heatsink) get's up to almost 100°C. this is REALLY hot, and i'm not sure if i can mount it directly to the any surface as i was planning to do it. of course balancing is not finished when the whole pack reaches 86.4v, and some cells are 3.66v, and some are 3.48v by then.
there is a question left: how can i assure that the pack has enough time to balance?
would i:
a) raise the chargers cut off voltage, so the earlier high cells will get even higher, but as well the low cells. so all cell can go above 3.6v which is the balance voltage set by the bms?
b) lower the charger's voltage at which it starts to lower current, giving the bms more time for balancing before some cells overshoot, and the pack reaches charger's hvc?
c) something different?
thanks!
ps: this is the datasheet and selected lvc/hvc values
https://dl.dropboxusercontent.com/u/1174616/24S D131 LiFePO4 BesTech.pdf