Quote:
Originally Posted by HarryT
Not true with all devices. Many devices have a battery life of a few days in "standby" mode, but will, of course, last much longer when turned off.
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"many" eInk devices may be a bit of an exaggeration. Yes there are a few that for some reason do not go into full "sleep" mode as they should with the key lock set. The current BeBook Neo seems to be one of those. The first firmware for the Astak PocketPRO was also like that, but that firmware was fixed in a subsequent update. Any eInk device that uses the ARM processor should be able to "sleep" with the only power being used to keep the SDRAM refresh operating from the low frequency sleep clock. The ARM processor itself is completely powered down in "sleep" mode. The power to keep the SDRAM refreshed is only a very few milliwatts, so the device can easily go several weeks in "sleep" mode and still have plenty of remaining battery. Any eInk device with an ARM processor that can only "sleep" for a couple of days must have some deficient hardware or software design, IMHO.