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I recently hooked up my H2O to a 10Ah battery USB brick when my H2O was down to 10% charge (which actually is much less). A full H2O charge only marginally changed the power brick meter display. Comparing this to a smartphone recharge or even a tablet, the H2O just nibbles here and then on its charge, at least for reading simple kepubs. As you are switching off your H2O you may save further on charge. However, starting your H2O anew will need quite some power during boot, so letting it sleep may be better if you read on a regular basis, such as every day or two.
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