IPhone won't charge past 1%?

I had full charge this morning and then when I next looked it was at 50% and then 1%. I know iPhone batteries are bad but this?
Anyway I put my phone on to charge but this wasn't working so I turned it off and tried to turn it back on but it won't turn on. If the phone thinks it's only 1% full it wont turn on.

Added (1). I have had the phone for less than a year?

The battery won't hold its charge because it is burnt out.

Buy a new battery.

I had a similar problem with my Macbook Pro a while back. Try buying a new charger for the device and if that fails to solve the problem the fault lies with the phone's battery. If this is the case you will most likely have to send it back to apple or the reseller you purchased it from.

Try to charge the phone turned off. If still the phone remains turned off, it might be an issues with the battery. If you've bought it less than an year, take it to the store, you've warranty left.

I had the same problem and solved it. When I would plug the phone in, it would just sit there showing the empty battery image on the screen as if it was charging, but it would never charge. I opened the phone, disconnected the battery after removing the small metal guard. I plugged it in without the battery connected and the Apple logo appeared on the screen and the phone kept resetting. I then unplugged it, reconnected the battery and closed the phone back up. Now it charges fine again. I think the phone just needed a hard reset for some reason and disconnecting the battery for a short time and reconnected seemed to do the trick.