Loyal Apple customer, previously happy with battery capacity, but in last week or so battery life suddenly decreased on 6S with latest update 9.3.5 about 9months old. No change in usage, and even turning off functions background updates, push notifications, locations, and dim screen, doesn't recover to previous life. Worryingly phone also seems hotter during charge so assume its working hard in the background on something although all apps closed and on lock screen.
