IPhone 4, Unsolvable promblem? (IOS6)?

Iphone 4 won't stay on without charger, won't restore (gets all kinds of errors), apple loop, broken lock button.furthest i got was holding the volume button and going in to safe mode but it asks to connect to itunes but i can't unplug it and put it into my mac, tried hold the alt ket and choosing a firmware myself still doesn't work, happened to 2 iphone 4 of mine, not been jailbroken?

Being a 4 means most likely the battery is dead. You'd have to send it into Apple and get the battery changed for $80 so it'll keep a charge… The batteries for apple devices can go about 4-6 years but after that battery life drains fast. My iPod touch 2g has to be recharged after like 30 minutes of use anymore in stand by it'll max last two hours to 12 hours still gradually dying.