2pcs 7.4v 2100mah 25c Lipo Battery for Syma X8C X8W RC Quadcopter Model Number:7.4V 2100mah 25c lipo battery product size(L*W*H):85*34*18mm Suitable for:Syma X8C X8W RC Quadcopter Plug type:banana plug(round plug) Your quadcopter with 2100mah lipo battery which is customized by our company will fly for a longer time.To make the battery charging process more secure, you can look at lipo safety bag in our shop,the product ASIN:B01GDSNLCQ