It's a little early to tell for sure. I've only had mine a week, and only made a point of leaving it on for the past couple of days since giving it a full charge. It hasn't dropped any, so far. With no reading happening, it ought to last 'a long time', reading every day, it still ought to last 2 or 3 weeks, if the sleep mode is done right. I don't like turning it off because it always does the processing new input thing - which takes a while if you have an SD card in, as I do.
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