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You should do at least 2 to 3, 12 hour charges to calibrate the battery to the battery gauge after you first got it after that charge as normal. Robert always recommended charging when it got down to 2 bars. For the first 12hr charges I always waited till it got down to one bar.
I always use the wall adapter to charge mine as well never USB.
I also find charging with the SD card removed it will charge faster and hold a charge longer. You can put the card back in once it's charged.
I charge mine for about 7 to 8 hours once or twice a month.
I can read about 2000+ pages before it goes to two bars.
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