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I replaced the battery on my 4 (I think it would be similar for the 4S).
£5 for a battery and tools off ebay and about 15 minutes using the iFixit guide. Definitely not an official battery but it worked fine and didn't explode.
moog-
I did this too, but on a 5. I was a little unprepared so had a weird moment burning my phone with a lighter to melt the glue, but now its as good as the day I got it.
A tip: Don't buy a battery rated higher than the OEM one (usually gold). They're just relabled seconds/recycled and if they work at all they'll be of less quality.
Kidneys
How much does it cost to replace the battery in an iPhone 4s?
Got a hand-me-down and the battery is only 75% design capacity.