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I consider myself a heavy reader and I read 2 to 3 hours each day. To figure out how many hours a full battery charge will last, I look at the Reading stats on the e-reader and and write down how many hours I've read. When my battery is wearing down I look at the stats again and do the math. Usually a full charge will last 40 to 45 hours using the light when necessary but having the wifi turned off.
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