My 6s is a few months old and I have some battery issues. Basically it used to shut off at 5, 6%, no huge big deal, but this has blown out to 12, 13% now it shuts off as high as 35/40%. There's no consistency to it though, it can sometimes last right up to 1% although this is very rare. Occasionally I've managed to restart it and it's lasted another hour and the battery % even increases without charge i.e it shuts off at 30% I managed to get it back on and it climbs to 32%. I've updated to the latest IOS and restored to factory defaults numerous times with no luck. I've taken it into my local Apple approved repair centre (Macworx) and was able to demonstrate the battery issue, but they ran a number of tests including a battery health test which came back as all OK. So I've spoken to Apple who say take it into their store, which is miles away, but I'm guessing they are going to want me to demonstrate the problem, which I can't always do and I'm sure they'll just run the same tests as Macworx. It's still covered under it's 1 year manufacturers warranty. Has anyone else has this issue?