ok,well i just got my first true AEG today, and the batt i got doesnt fit :(
If it doesnt fit you could tape it to the stock. its what my friend did with his m16.
i cant really tape it to the stock because it is an AK-47S series, i think the batt is just to big
if its the 4/5c 1500 from AEX, it should fit...