IPhone 5s battery replacement?

My iPhone 5s battery life is really short (about 4 hours) and I want to get it fixed but I don't really wanna pay over 30 pounds any suggestions?

I would just take it to an apple store and have them put a new one in. Then its like a new phone again. If 4 hours because you are playing continuous games, then keep in mind that some high powered games consume alot more power.

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