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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.
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Very easy to do yourself, especially on the 4s. If you google iPhone parts a few of the top sites will usually have genuine batteries for no more then £10. Replacing it takes 10-15 mins, just follow the ifixit guide.
moog
haveo
@Well_is_it
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.