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Originally Posted by Nick_1964
It is totally safe to read until the device shut off, the warning is there only to tell you that if you don't charge you can't read anymore, it isn't telling you that it is dangerous to read any longer or the battery get's damaged.
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It's telling you to charge. But it's a religion, I guess. You can find sources for either belief in the world wide web, here's mine:
Quote:
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Originally Posted by https://en.wikibooks.org/wiki/Battery_Power/Lithium_Ion_Batteries#Guidelines_for_prolonging_Li-ion_battery_life
・Lithium-ion batteries should be charged early and often.
・Lithium-ion batteries should never be depleted to empty.
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