IPhone 4s battery problem (no supprise, I know)?

My phone battery literally went from 100% to 97% in 10 seconds.

Is there any reason why my battery is going down so quick and is there anyway I can resolve this issue or at least manage it properly?

(iPhone 4s 16GB)

If you double tap the home button then hold down on one of the apps until they start shaking and then press on the minus until there are none left, closes the background program's, if you're on the Internet quite a lot it'll go quickly and there's not much you can do about it:/

This happens to my iPad.

Here are some tips:

Let you iPhone run completely out of charge once a month.

Turn the brightness down.

Games like FIFA will run the battery down FAST!

Keep it on sleep most of the time, or turn it off.

How long do you use your iphone4s? Maybe you carry a power bank in your side

Double tap home, and apps should come up with minus, delete them all, not the apps themselves the running apps

Turn brightness down to medium or below

Turn off battery percentage this wastes battery power as well

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