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Re:If your iPhone is slow, try replacing the battery by threeseed on Sunday December 10, 2017 @01:47AM (#15890306)
If your battery is dropping by a half in 15 minutes then clearly something is seriously wrong.

I would get your battery checked out for a start. Many of us (including myself) have iPhone 6s and seen no major issues.

Re:If your iPhone is slow, try replacing the battery by samstave on Sunday December 10, 2017 @12:35PM (#15892430)
mine does this randomly (6s+)

basically there are times when it will drop sigbnificantly in a short period, but i have also had it last significantly at 1% and go from ten to 1 in a second - then i rush to plug it in and as soon as I plug in the cablee it immediately jumps back to ~15%

so I think its both hardware and software...