Why does my iPhone 4S run out of charge fast?

It was at 98% then i played clash of clans when i stopped it was at 68% then i kept playing other games it lost about 50% in 1 hour… Why? It wasn't like this yesterday. How can I make it run out slower the brightness is at like 25% any ways to make it run out slower?

You can shut off un-needed apps, you can turn off Wi-Fi, you can enter airplane mode, and you can set the phone to conserve power as methods to extend battery life.

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