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Old 09-16-2012, 03:58 AM   #111
DNSB
Bibliophagist
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Posts: 35,570
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Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Forma, Clara HD, Lenovo M8 FHD, Paperwhite 4, Tolino epos
Quote:
Originally Posted by vitor.fernandes View Post
Hello guys, I am shocked nobody here seems to know how e-ink works, it doesnt work like LCD so, it uses battery not per minute or per month, but per page, it only takes battery when you change pages, and the content stays on the screen like real ink stays on paper. Saying it lasts a month or 2 is relative, depends on how fast you read.

With this information, of course it is best to leave it in standby, even if you only get back to it a few days later, it still takes less battery than rebooting the device.
The display is not the only part of the device that uses power so while the battery drain in standby is quite low, the battery drain in power off is lower. You might notice the delay when turning it on from power off from when you slide the power switch to when it starts booting up compared to the almost instant resume from sleep mode.

Even something as simple as adding an SD card (tested from the Kobo, Kobo WiFi and Kobo Touch) reduces the battery life -- not greatly but noticeably.
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