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On certain batteries, ff you don't use your battery until your device shuts off, and recharge it before that point often enough, the battery becomes weaker for it. Think of it in terms of exercise. You get muscules by pushing yourself beyond your normal limits. But the thing is, if you hit a certain level of exercise, and then stay at that level of exercise, your body gets use to it (they call it plateauing) and even though you are exercising, you don't continue to develop muscles any more. Well, in batteries, it is a chemical process that creates ionized electrons that flow from one end of the battery, through your circuit, and back to the other end of the battery. If you don't take full advantage of the full voltage necessary to run your device (or most power hungry device you use if you are using multiple devices), the chemicals in the battery start to weaken. As a result, if a battery would normally last 5 hours, you might find that after some usage and premature charging, it only lasts 4 hours. If left to go too long, this basically means the battery is ruined. But in some cases, you can actually find a power hungry device, keep using it until device shut down and recharging it fully several times in a row, and get some or all of your extra hour back. I call this exercising the battery.

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