Not necessarily. You could just have a single cell that is slightly higher than the rest in that group causing it to over charge. @ that point you’re pretty much fucked if you want to fix it. You’ll have to pull group, find the over charged and bring it down. If you dissemble then I check every last cell.
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I dont think those generic charges have that capability. I could be wrong but most generic chargers I’ve opened dont have one. Just my experience
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This one does (/should) i have the same one, just in 10s.
I have set mine to 41.8v but i stop charging earlier manually.
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I checked the output before, it is 50.4V
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Dammit, it is actually possible that there was a slight variation between cells in those 2 groups but I thought it wasn’t significant enough to be an issue. And for some reason, that they would balance out when connected in parallel, I don’t know why I thought that tho
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Can I “solve” my problem by charging to 49.xx or something? If this is the problem I have?
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I’ve seen this not happen more times than I’ve seen it happen. You would think they drift balance between themselves but again, I’ve rarely seen that happen. Especially if there is a difference greater than .05.
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Dammit, here is what I get assuming shit I have no experience in 
.
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Yes. If you want good life from liion, it’s good practice to do 20/80. Dont discharge below 20% and dont charge over 80%. I tend to go 30/90 but that’s me. Nothing wrong with limiting the max voltage.
And in doing that you may get lucky and it semi balances its self out. No guarantee though
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Mistakes are made to learn from lol
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Alright I will do that next charge.
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Just to be clear, 0% on a 12S battery would be 30V 100% is 50.4V so 80% would be 46.3Volts right?
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if you want your pack to last you, the furthest you should drain to is 36v, i’d personally recommend 38.4v for the best longevity (3.2v/cell)
That being said, 80% is not 46.3v as the voltage curve is not linear. 80% is closer to 47-48v from my experience.
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Just charge till the highest cell is at 4.1v
No damage done
these numbers like 30/90 are confusing with liion. i think we should just refer to cell voltages. I discharge my cells to 3.4v (at most) and charge up to 4.15v
For me I discharge to 3.2 end cutoff, seems to be good for me.
i dont like hard cutoffs incase of emergency. my hard cutoff is at 0v, but my soft cutoff is 3.3v/cell.
I have metr pro so if I need more I can always just reconfigure on the road
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Well they will equalize (all the cells in each group will end up at the same voltage/state of charge), but whatever that average point is, isn’t guaranteed to be a direct linear math equation, since the discharge curves aren’t linear.
I still think it’ll probably all end up nicely balanced, it’s just gonna take a bit for those last few cells to get in line.
If things haven’t improved in a day or so, then I would consider manually charging/discharging the appropriate p-groups to bring them all within <0.05 volts of each other.
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I will rebuild my board this winter, for next season. And i wont be able to ride until maybe april next year.
Winter is coming soon here. It will rain, be cold, and snow pretty soon. Maybe a couple sunny days left. 
So. If i take my batterypack out, disconnect it from the esc, will the cells be at the same charge as now when i reconnect it? And at what voltage should i store the pack in? 10s4p 40t3.