goatman
10 MW
john61ct said:goatman said:if they had a bluetooth bms like the Ant bms
you could set the lvc at 2.5v
program balancing to start at 2.8v
I've never heard of a protective BMS that bottom balances.
Only dedicated balancers ( marketed as "non-protective BMS") or node charging can middle or bottom balance afaik
> i think charging to 4.2v killed it
No way, that has a relatively minor impact on longevity.
Using second-hand cells is inherently risky even if only 1P
Given that many will be past EoL, putting them in parallel groups astronomically increases the odds of quick pack failure
even with rigorous testing of each cell individually and discarding the majority.
If you want a reliable pack you have to buy a known good cell model
new, Grade A from a reliable source
on the ant bms you can program it to start balancing at whatever voltage you want
turn it on, turn it off
its an easy way to do bottom balancing and pack maintenance
then turn off the balancing function til next time
time stamped
https://youtu.be/Z7M_kNB7ltI?t=646
if i bottom balance to 3.0v
thats my lvc
all the cell groups should hit 3.0v all at the same time under load
at rest they will bounce back to 3.3v/3.4v
like you say, stay away from the shoulders