Now here's an odd thing: the iPhone 6S has worse battery life than last year's iPhone 6. It makes sense when you drill into it: the old phone had a 1810 mAh battery pack, and the new iPhone only comes with a 1715mAh option.
There are multiple reasons for the smaller battery pack: a larger motor needed for the 3D Touch interface, and the extra space needed for the pressure sensor.
But the bad news is that this doesn't get offset by efficiency improvements in the upgraded iOS 9 - the iPhone 6S performs worse in our battery tests.
For the Full HD 90 minute video test (at full brightness) the new iPhone dropped 30%, compared to only 26% for the older model.
Given battery life was already a concern for iPhone users, bringing out a new phone with a shorter time between charges is criminal.
Price and availability
The iPhone 6 has been out for a year, so it's readily available from numerous stores including Apple's own shops and website, where it's dropped to £459, US$549 or AU$929.
The iPhone 6S has been out for a few months now, but costs quite a bit more than the iPhone 6. The iPhone 6S starts at £539, US$649 or AU$1,079. That isn't likely to drop down until we see the iPhone 7 release either.
Verdict
If you're stuck on the iPhone 5 or 5S, then you've got a conundrum here. The iPhone 6S has loads of great upgrades, with 3D Touch easily being the pick of the bunch. Its 12MP camera does offer a slight jump forward, and you'll at least get half an hour's joy out of Live Photos.
However, there's the issue of price. The new phone is a lot more expensive, and with a similar camera, same chassis and a lower battery life could make you think twice about the older iPhone 6 - or perhaps wait another year for the iPhone 7.
The iPhone 6S Plus - especially if you're after a better battery life - might well be worth a look if price is less of a worry for you, but either way you've got a bit of a conundrum if you're ready to upgrade your iPhone.
