I've found the firmware to be very stable and the battery life is great. Yesterday evening, I started at 91% and read on a treadmill where I have the font set to pretty big so I can see it, this also means I have to turn the page frequently. I read for 50 minutes and the battery was at 85%. Today, 12 hours later, I just checked the battery and it's at 85%. Wi-Fi was never on during this anecdotal test.
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