The battery doesn’t need calibrating; sensors in the battery never allow them to overcharge. The reason you want to run the discharge/recharge routine is simply that the battery gauge, which measures the output power of the battery in order to determine its level and times the progressive discharging to estimate the amount of charge remaining, can be misled by various conditions. This is especially noticeable if you’ve recently had a new battery installed, but it also happens as a result of external factors like temperature or software factors like sudden changes in demand on the battery that lead to meaningless or corrupted timing estimations. And, although I’d argue that recalibration is up there on the same scale as resetting the PRAM for effectiveness, there’s no doubt that it can be helpful; I only recently had to recalibrate the gauge in my BrailleNote Apex after replacing its battery. Lithium-ion, since you asked.
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