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It's a good idea to fully charge the Kindle so it can calibrate it's guage and give you a more accurate reading. There's no real reason that I know of to do that before you use it. Just don't put too much trust in the gauge until you do.
Memory problems were common in the days of NiCad batteries. If you constantly discharge them to about the same point and then charge them that would become the new low point for the battery. That could be avoided by doing one or two fairly complete discharges followed by a full charge every month or two.
Other kinds of rechargeable batteries don't have that problem. NiMH batteries are hurt by complete discharges. Lithium ion batteries aren't much affected by any of this.
If you google Battery University you can find a lot of information about this and on how to best care for a l-ion battery. They have charts that show that charging it more often rather than letting it get well discharged gives more overall battery life. But the differences are small. These seem to be fairly rugged batteries.
Of course a total discharge is very bad for any battery.
Barry
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