Quote:
Originally Posted by elcreative
There's a good reason for clock updating on page turns, it's called battery life... every clock update counts as a page turn so if done on page turn then no additional overhead on power usage, if every minute then each minute's update is an additional page turn as far as reader is concerned... 
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Yes, it drains the battery faster--AFAIK you can turn it off (only update on page turns).