Sinner thats why I switched from a Jetbook to a JBL. When you forget to plug it in overnight, and it tells you battery level critical, shutting down now. You know your just plain out of luck for at least 4 hours.
When the JBL does that, I go swap batterys and in 5 min I'm back reading again.
That to me is the single defining advantage of the JBL over the rest. But yes it does come with a cost, it weighs 2 oz more.
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