Second post - let's talk about discharge. Lithium ion batteries do not tolerate deep discharges well. Although it's possible to run a battery down to 0% on the meter, what is really happening at this stage is the device is shutting down above the terminal (lowest) voltage of the battery in order to save it - if lithium ion cells fall below a certain voltage, they can be irreparably damaged and won't be capable of accepting a re-charge.
The best thing to do, on the low end of the charge spectrum, is to avoid discharging below 30% whenever possible. The bottom 30% of the charge profile is taxing on the batteries from a electro-chemical/physical perspective, and using them in that range causes more wear on the batteries.
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-Scott
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