![]() ![]() The upper end of the range typically is around 100% of what would be an acceptable charge limit. Storing it "dead" would be well below the recommended 40% and is close enough to truly dead that it can self-discharge to below the minimum level to recharge in a few months. The BMS does handle a lot of that, but it's far outside of 40-80%. For a casual user, it's just easier to say trust the BMS and never store a battery below 50%, and they'll get hundreds of cycles and many years out of it. ![]() In short, it's more complex than either of us stated, and thermal cycling of short charge cycles can have an impact as well. Keeping a Li-ion between 80 and 100% is generally not ideal for maximizing lifetime, but you're correct that it's not a one-to-one for a deep cycle charge. If you're really trying to maximize utilized capacity over a lifetime, you'd charge from around 50% to 80%, deep cycle every 20 times or so, and store at 50-60%, though of course the optimum levels change a bit depending on the cells used. 40-60% SoC twice doesn't necessarily equal 60-100% once. Depth of Discharge from one section of the curve does not typically equal percentages from another section. Cycling from 25% to 80% will yield a longer lifespan than cycling between 50% and 100% SoC even though you get more utilization from the former. Well, it gets to be more complicated than that. ![]()
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