@jessmahler @Qwyrdo The full drain and recharge doesn't really affect the battery itself as much as the circuitry in the device that's used to track the battery's state of charge; if it gets desynchronized from the battery's actual state of charge, it can get a little confused. Lithium-ion batteries (all batteries, actually) have a flattish portion in the middle of their discharge curve where just measuring the voltage isn't really a good way to determine current state of charge, so instead it does what's called coulomb counting, where you just count how much charge is consumed from the battery. This can get out of sync from errors accumulating over time, and cause the device to think the battery is more full than it actually is.

There's no risk of this leading to damage to the battery, as it's very easy to tell when the battery is near 100% or near 0% and cut off charging/discharging accordingly simply by measuring the battery voltage; it's just in the middle of the discharge curve, between 75% and 25% or so, where it can get confused and prematurely turn off or something
-F