IPhone 4 turning off after unplugged from wall or PC/MAC

Hi
Can someone help please?
I sold my iphone 4 recently and it was returned to me.
The guy had it for 6 hours and it suddenly crashed apparently (this is his words)!
He then tried to restore and it failed with unknown error 21.
Im no stranger to resetting and sorting an iphone out but this one has me banging my head against a brick wall.
I have tried to restore and the same error occurs.
I have also tried entering into DFU mode etc and the same results.
Volume up and down and resetting still no change. 
I took it to the apple store as a last hope to see what they said and they dvised it had been tampered with so would not test any parts!
Should i try a new battery? Or is this something else? Has anyone seen this before?
Needless to say i am furious as i personally feel that this may have been a drop/water damage or jailbreak gone wrong or, even worse, a logic board swap SCAM.
Any help would be great.
Cheers

Hi
Thanks for the replies.
I have this afternoon taken the phone to a third party repair service store.
They took the battery out and used a fully charged battery, which i saw power another iphone.
This did not fix the issue.
The gent in the repair shop told me that it looks like a logic board fault. He also mentioned that it looks like it had been tampered with!
He also advised that he has seen a huge increase of this sort of thing happening on ebay.
He wished me luck with it and closed the phone up.
So it looks like i am now left with a dead phone and a fight with ebay! :-(
Cheers all. 

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