This is what I had.
http://www.airsoftgi.com/product_inf...oducts_id=6195
It's a tight fit re. diameter...and it is longer (IIRC) than a 9.6v NiMh mini stick. IIRC it does not fit up into some AK's (I think Nacchi had issues with getting one into his RS AK).
Because the wire that connects the end of the cell back up to the connector is an actual wire, and the cells are a bit bigger than a 2/3A cell it might be a no go unless the space in your rifle is generous. I had to open up the opening on my KA Galil to get it through without mangling the battery.
I'll check what the C rating is...I think it's 20C. You're welcome to swing by and test fit/fire it if you want. Mine's got a solid year into it, so it might not be as spiffy as a new one.
Tys