1. babu mohan1's Avatar
    Date and time how it is working when my tab or mobile is switched off??
    02-21-2018 12:45 AM
  2. chanchan05's Avatar
    Backup CMOS battery. All devices like smartphones and laptops with time keeping functionality and whose features are reliant on that have CMOS batteries which continue to run a clock while the device is off.
    02-21-2018 12:47 AM
  3. babu mohan1's Avatar
    I guess there is no CMOS battery in mobile or tab.CMOS BATTERY will be in PC.
    02-21-2018 01:06 AM
  4. Rukbat's Avatar
    In a phone the internal real time clock runs off the main battery (but it draws so little that I've had phones turned off on the shelf for a couple of months and they didn't gain or lose more than a minute or two - and the battery still had plenty of charge. I wouldn't recommend doing that, but it did work a number of times. (When you own a cellphone store, sometimes a phone gets lost somewhere, only to turn up a few months later.) But that's how the time is kept - by a small part of the hardware that runs off the battery even if the phone is turned off.
    02-22-2018 02:17 PM

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