[tz] If you lie about the time zone, your iPhone will have its revenge

[Paul Eggert]

iPhone 6s and iPhone 6s Plus users are reporting that their phones are sometimes 
showing plenty of charge left even though their batteries are actually depleted, 
leaving some users stranded out of power. Apparently users who change their time 
(e.g., to gain unfair advantage in games like Candy Crush Saga) can confuse iOS 
9.2 into not updating the battery percentage indicator. A similar problem can 
occur to users who set the time zone manually. One workaround is to reboot and 
revert to getting date and time from the network.

Reference:

Smith J. iPhone 6s battery bug leaves users longing for iOS 9.3. 
GottaBeMobile.com 2016-01-17. 
http://www.gottabemobile.com/2016/01/17/iphone-6s-battery-bug-leaves-users-longing-for-ios-9-3/