How to avoid draining battery on my iPhone?

How can I avoid draining the battery fast on my iPhone when I'm watching movie or playing games?

Turn off Wi-FI.close other apps

Don't use as many apps or go to your settings and lower the brightness maybe try to turn off the screen right away when your done using it they also have a iPhone case that hase a built in charger it's pretty cool it charges your phone for a good while but it is pretty expensive

1. When you charge your battery, make shure it is not in a case, this will overheat the battery and over time it will last less and less time.
2.turn brightness down.
3.turn on airplane mode when possible.wireless signal kind of stuff drains your battery very fast.
4.once a month, charge your battery to 100%, and don't charge it again until it dies. This is another good way to keep your battery in good condition over time.

Decrease the screen brightness and close the unused apps

When you have to concentrate on audio or movie, do not use streaming solutions, which always places overuse on the phone's battery. Just play movies or tunes currently packed for your iPhone. Also, don't play games which demand a link, like "Words With Pals" or "The Simpsons: Tapped Away," or games which require mobile phones to enhance their CPU's, like the "Infinity Blade" collection.