Never had to pay attention to battery life short of disabling wifi, which I do anyway, because I don't want the reader to auto-update firmware or to send user statistics to the manufacturer.
My 5 year old Kindle Paperwhite 1 doesn't have the battery life anymore that it once had, but it can still go for about 10-14 days with normal usage, which is good enough for me. Maybe, at some point, I'll replace the battery so it can go for another 5 years. It seems the KPW1 is one of the last readers not glued shut, with a glued down battery... it's one of the reasons I haven't sold it when I got the KA1. It's a good backup device.
The Kobo Aura ONE I have can go for about 2-3 weeks as well (since I've had it, which is about 17 months now), but it obviously uses more power because it has a bigger screen.
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