Anton, yes the big no-no with lithium chemistry batteries is to leave them high or leave them low. Certainly charge them to 80% and discharge to 20%. Or target a little narrower band (70%-30%) if you want your batteries to last 20 years or more. An occasionally wider band (100%-10%) is helpful with many BMSs (the edge of the performance envelope has more obvious voltage changes, and some % of BMSs only do "top-balancing"). Just don't leave them high or low. A minute is inconsequential, an hour adds up, a month would shave years off their lifespan, and a year would likely kill them. The time spent at naughty State Of Charge levels (the ballpark of over 95% or under 5%) savages battery lifespan. And certainly no trickle charge... that just leaves them high all the time.
I would be very reluctant to drain lithium chemistry batteries all the way to zero. If it keeps me alive, I'd do it, but I'd have to assume it kills or cripples them within minutes or hours.
And yes, you are in the ballpark with cycle count. Each manufacturer probably counts cycles different, even to the point of not counting any cycles if you stay between 60% and 40% (guessing, because the chemistry is so stable at these voltages in room temperature).
I would be very reluctant to drain lithium chemistry batteries all the way to zero. If it keeps me alive, I'd do it, but I'd have to assume it kills or cripples them within minutes or hours.
And yes, you are in the ballpark with cycle count. Each manufacturer probably counts cycles different, even to the point of not counting any cycles if you stay between 60% and 40% (guessing, because the chemistry is so stable at these voltages in room temperature).
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