You might want to wait before downloading Apple’s most recent iOS update, or you could end up with a fried battery, reported The Sun

Citing Apple users’ complaints on the company's own support site, The Sun reported that after downloading iOS 10.1.1, phones would reach a 30 percent battery charge, then quickly drop to zero within seconds, before shutting down. According to one user, once the phone was plugged in, it would reboot and appear to be at 30 percent again.

“When I unplug it right away it still shows 30 per cent and runs like nothing happened for a good few hours,” wrote the user. The user also reported the battery draining and being dead the next day even if the phone had been shut down the night before. Other users reported similar issues. The battery usage list doesn’t give any reason for the battery’s shortened life.

As reported, a factory reset doesn’t help, nor does reverting to iOS 10.  “Don't waste your time on rolling back to 10.1.” wrote JimS-in-Seattle on an Apple support forum. “I unfortunately confirmed faysal22's comment that 10.1 does not work. My phone is lasting about 3 hours now.  Instead of the battery shutting down at 70% it is now shutting down at 85%.  I cannot tell you how many calls I have been bumped from.  BTW, when it happens my phone is essentially dead for about 10 minutes before I can use it again.”   

Some users who have enrolled in Apple’s beta program have reported 10.1.1 (14B150) solves the battery draining issue, but others have said it doesn’t.

The first version of iOS 10.1.1 was released October 31, while a second version was released Nov. 9.