My iPhone 3GS keeps crashing and turning off randomly?

I'll charge it overnight so it's 100% in the morning, it'll work fine for an hour or two then whenever it hits around 50-40% it just crashes and turns of randomly, When I turn it back on and it usually crashes again and I try about 7 times till its working again, then when it's back on it'll say I only have about 15% charge

What's going on?

IPhones, pfft.

Well since its so out of date, everything now is just made for the newer stuff. Therefore, your device probably isn't made for it and can't handle it

I too have a 3GS I have been told that what happens is the battery gets worn down over time and the slightest things start using up more charge (don't worry I have the same problem I have figured out with my phone that 30% is actually 15%ish) I hope this helped

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