Why does my iPhone Die so fast? It lasts about 30-40 mins on a 100%?

I have a 4s I charged it for the night
Then go to school with it
It dies completely in about 30-40mins
Was wondering if I should get a new battery

REplace the battery.

Definitely replace the battery.

You have probably over used it too much. It is best to charge your phone when the battery is almost dead so over time if you charge it when it's like 30% etc. Then this will kill the battery. It's best to get it replaced

My android phone dies in 4 hours, but I stream music and surf the web a lot. I talked with a service center about it and they said having a lot of apps that continue to operate in the background when closed, keeping the screen too bright, and keeping Wi-Fi, GPS and synch on continuously will quickly drain any battery. Get a file cleaning app (Clean Master-Free for android), limit screen brightness, and turn off functions not immediately needed will help. Personally though, it sounds to me like you have a bad battery.

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