Did iOS 10.2 make the iPhone's #batterygate problem even worse?
Those iPhone units with the problem will simply stop working once the battery hits 30%. At that point, the unit shuts down as though it hit 0%. Plugging the phone in will return it to 30% and from there, the phone will charge normally. In another variation of the problem, the battery goes from 30% to 1% but stays at that 1% reading for as long as several hours. Some iPhone users are saying that iOS 10.2 exacerbates the battery problem.
Because Apple stopped signing iOS 10.1 and 10.1.1 on Wednesday, those who have found that iOS 10.2 makes matters worse cannot go back to the older iOS builds. However, some iPhone owners who are beta testing iOS 10.2.1 say that they have seen an improvement in the issue with their handsets no longer automatically shutting off in the 30% to 50% area. In addition, a battery diagnostics tool not mentioned in the changelist comes with iOS 10.2, and will reportedly help Apple study battery life on many units. This could help the company fix the issue.
In the meantime, it isn't a perfect nor pleasant workaround, but carrying a power bank will at the least keep your iPhone running despite what is being dubbed #Batterygate. Apple has promised a free battery replacement for certain iPhone 6s models.