My iPhone 4 battery life is short? - 1

My iPhone 4 battery life is short, it dies at 20% instead of 1% and it loses its battery fast, do I need to replace the battery?

It depends how long you have had it for and how long you keep it on charge. If you've been leaving it on charge for the whole night since you've had it, that's what keeps killing it. I would recommend getting a new phone altogether as if you get a faulty battery, it can destroy your phone (your phone could literally explode)

I would take it to the apple store but if your contract is up I would just get a new contract and a few iphone 4 with it (or upgarde to 4S or 5) then sell your 4 (with bad battery advertised).