The gun no idea, the batteries in my opinion are worthless.
the top battery looks like it has been repaired and for the cost of batteries brand new and risk of crappy ones blowing up etc I would personally never bother with a 2nd hand battery.
A few companies have made a "krinkov" AK variant: SRC, DE, JG, CYMA.
My best guess is that it is a JG krinkov. I even searched for a picture:
If you're trying to sell it, just know that it isn't worth much second hand (<£80). The batteries aren't worth anything at all since most are in favour of LiPos.