What can I do to get my iPhone battery to last longer?

I close everything running. But if I listen to music or look at videos, it drains very fast. Like 30 minutes.

Probable need a new battery - It' either worn or damaged.

It's dying. Same thing happened to my mother-in-law. Time for a new phone. I recommend Samsung Galaxy.

Could look into your battery health & if it is 80% or less should look into replacing it.

As far as other things, in the case of music, of course you could lock your phone while doing that. As far as videos, you could lower your display brightness.

Could also take a look at what apps are doing background activity & close them as you see necessary.

Replace the battery.

That sounds like a bad battery. You didn't mention what iPhone you have, but if it is more than a few years old, then chances are high that the battery is worn out by now.

Pay to replace the battery or pay to replace the phone. There's nothing to type in, no secret menu option to turn on or off. Keeping the screen brightness lower than full can help, but that's the thing, if you expect the phone to be in constant use, with the screen on, texting, playing a game, watching videos or playing music all while connected to the internet, you can't expect HD 1080P smartphone that is always connected to have the same battery life of an mp3 player, old style portable FM radio or non internet candy bar cell phone with a 2 inch mono colored screen.

You should buy a new battery

Don't use wallpapers, bring the brightness down to 0%, get rid of the battery draining apps.

Open drawer
Insert iPhone into drawer
Close drawer
Buy a Samsung

Worked a treat for me and saved money?

Try not to let your iphone die more than once a month. Letting it die a lot per month makes the battery trash, if you try and get it back on track it may still be repairable! Hope this helped.