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Today's batteries do not need to be run out. They work better if they are kept charged often. How long do they last? Depends entirely on use. But I would expect at least a year to two years even with heave use.
You'll know when to replace it because it will stop holding a charge as long.
The checker does sometime tell you to calibrate it by discharging it completely and then recharging. I am not convinced that it does anything.
I assume the software would monitor the discharge and recharge rates and compare the current maximum voltage/charge level to the specification for the battery, or to previous readings.
Dell have now started building monitors into the actual battery units, that report to the computer, and through a series of LEDs on the battery the current charge and the current battery health.
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