ok, actually not building my board and letting it sit for over a year with the BMS attached killed it.
total voltage: 0.225v
each pgroup: 15-20 mV
sit time: 1y 6mo.
got this battery built in june of 2021, didn’t build my board. gave it all to @DEEIF, who also got too busy to get to it. So it sat.
now it’s dead.
let my dumbness be many lessons to the rest of you. 
imagine the engineers making a smart bms and not implementing a voltage cutoff 
dumm
Batteries are like Tomogotchi, the little bastards need attention on occasion 
that’s a fair point.
It’s like. battery low… i will cut the load… but me? me? im special. i get power.
What is the exact smart BMS? Just so anyone else can avoid it happened to them
sorry to hear, I’ve seen this happen a few times. Generally happens with dud units.
Whack, I’ve never seen This happen before. Is it possible the voltage precision was set too low and passive balancing was activated?
Unfortunately your battery wasn’t the only battery that died while it sat. @DEEIF supersport battery died too because of vici wiring it wrong. Smart bms drain is funky, always unplug bms if you are going to let it sit
Hmmm?
A BMS manufacturer shipping dud units means they are a shitty BMS manufacturer.
I guess there is no good BMS manufacturer.
How do you know they are duds?
i never got to look at it. probably however it was set from the factory. Maybe I can try to set myself up to power it on and see if I can get the settings.
Factory settings wouldn’t have killed it. But yeah let’s see if we can take a peak at them
watch idle drain. if its significant you got a dud
Can they be turned off with the 2 wire plug?
just had my supersport sit for nearly 6 months at 3.8v. cells are fine
I had the bms app connected on a phone I rarely use and that drained a battery pretty quick.
It was a custom battery
