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Battery life is great for me on 7.0.4.
iPhone 4S that's two years old.
That's double what I get, 4S 18 months old lucky to get 4.5 hours. Phone has started to do the random shut down at 40% and needs to be put on charge at which point it switches back on with 40% battery. Wether it's a iOS or hardware problem I could't tell but it's an Apple product and I pretty disappointed with this.
 
That's double what I get, 4S 18 months old lucky to get 4.5 hours. Phone has started to do the random shut down at 40% and needs to be put on charge at which point it switches back on with 40% battery. Wether it's a iOS or hardware problem I could't tell but it's an Apple product and I pretty disappointed with this.

I would be disappointed if mine started doing that

Have you tried a restore to see if that fixes the issue? If yes then I would take a trip to the Apple Store.
 
That's double what I get, 4S 18 months old lucky to get 4.5 hours. Phone has started to do the random shut down at 40% and needs to be put on charge at which point it switches back on with 40% battery. Wether it's a iOS or hardware problem I could't tell but it's an Apple product and I pretty disappointed with this.

That sounds like a bad battery to me. I would have Apple run diagnostics on it to determine for sure. Apple will replace it for like $79 I believe. If you want you can always use one of those 3rd party battery repair sites as well for less.
 
@bbfc and @sbailey - Thanks, I will try the restore and Apple store visit - I also feel its a hardware issue, seems to happen when phone is cold and it's damp outside (not uncommon in UK at this time of year). Having to replace a battery potentially at my cost on a phone still under contract (original was 24 months, 7 to go) doesn't sit well with me though.
 
That's double what I get, 4S 18 months old lucky to get 4.5 hours. Phone has started to do the random shut down at 40% and needs to be put on charge at which point it switches back on with 40% battery. Wether it's a iOS or hardware problem I could't tell but it's an Apple product and I pretty disappointed with this.

1. HW problem. Get it exchanged.

2. Apple don't necessarily use quality component. Actually, in cases, just the opposite:

- the battery in the first batches (Sep...Nov 2012) of iPhone 5
- the battery in MANY 3G S'es: see for example my own photo gallery of two (!) company 3G S'es I've serviced this Summer and have taken photos of their ridiculously swollen batteries:

http://www.flickr.com/photos/33448355@N07/sets/72157633931601917/

Also, google for "swollen iPhone 3GS battery" (without the quotes) for more examples.
 
(Registered Apple Developer 5 years) iOS 7.1 beta 2 has amazing battery life on an iPhone 5 here 9hours usage with 3G 12hours standby @ 3%. Got nowhere near that on 7.0.4 or 7.1 beta 1.
 
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