||JG / BOYI / CYMA / DBOY AEG in general are very affordable #1 deal AEG as many reviews will point out. However, the free battery that come with the gun is just a standard 8.4V.
Because all the guns are upgraded to shoot over 360 FPS, it is recommended to buy a better battery to result it's true capability.
A good recommended battery to get for this aug that will fit into the stock without much work - from low capacity to high (better performance)
8.4V 1200mah small type
8.4V 1500mah small type
9.6V 1600mah small type
9.6V 2000mah nun chuck type
9.6V 2300mah nun chuck type
11.1V li-poly (recommended for experienced players only)
Overall review: a good gun, can't go wrong with this price. It is overall a better rating AUG than the Tokyo Marui or Classic Army model, and only half the price. (Marui and CA don't include battery in their guns, and if upgraded to shoot 360 FPS with a free 8.4V 1000mah battery, it's cycle rate will be slower than this AUG, the CA motor probably won't even shoot.)
Rating: [5 of 5 Stars!]