Phone battery during a concert?

[377]

I'm going to a Demi concert this Friday and I'm bringing my phone to take pics and stuff but I'm afraid it'll run out of batteries half way through even if i charge it fully.

Should I bring one of my portal iphone chargers or should I bring an additional apple device just in case or should i go buy one of those phone charging iphone cases or what?

please give me some advice thanks!

[Maggie]

put your phone on airplane mode!!!
it'll cut off all internet connection and it wont kill your battery. just make sure that afterwords you turn airplane mode