I have two Paperwhites. Both are WiFi onlly. When I'm reading one--red cover-- the other--brown cover--is charged and waiting its turn. When a Paperwhite tells me it's time to charge, I charge when I get home. Then I set that PW aside. I use Airplane Mode whenever I'm on an airplane and I haven't been on an airplane for over nine years.
My Paperwhites will sit up to three days with a full charge and don't seem to lose any of the charge.
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