iPhone Error 21. Battery dead? Headphone Jack white and Bottom port pink/red

[WhiteIphone5]

i bought an iphone 4 from ebay.
ESN is clean. When i received it the headphone jack water sensor is white but the bottom port is red/pink. The iphone is in perfect condition, no cracks or anything at all. Issue is when plugging the iphone to itunes i get the recovery logo. I put the iPhone in DFU, and have also tried to use TinyUmbrella and kick it out of recovery mode. Nothing happens, however when i unplug it from the computer the phone is completely dead.
im receiving a new battery tomorrow, so i cant really test anythign right now.
I'm really hoping its the battery as i can just swap it out, what do you guys think? does it sound like its a battery issue?

 

[WhiteIphone5]

anyone had this problem before?

 

[maliu]

Sounds like it got water logged.

 

[Applejuiced]

Doubt its just the battery.
Sounds like its shorted out.
Hope the seller told you about those issues. If not I'd try to get my money back.

 

[MrMacMack]

I think I would be returning that phone to the eBay seller.

 

[WhiteIphone5]

wouldn't it be the battery though? since it dies when unplugged?

 

[WhiteIphone5]

DONE. Replaced Battery and all good to go.!
you guys scared the **** out of me lol

 

[WhiteIphone5]

Well, i spoke too soon, the iphone became really HOT while charging, and the percentage dropped every 15 secs, then today it died. Tried it on my older iphone and wouldnt power up. so battery is dead. has some green liquid on it, i just found out its under warranty too .
i hate this but im gonna go to the apple store and tell them it was leaking
i wish i can be honest but i dont know what to do now.