WLtoys V913 Brushless Version Parts 7.4V 2600mah 25C Battery Remote Control Toys Parts Name: 7.4V 2600mah 25C Upgrade Battery . Usage: For WLtoys V913 Brushless RC Helicopter. . Notice: . This upgrade battery can not be used with V913 original brushless main motor (SKU158707). . It is used in conjunction with this upgrade brushless motor (SKU138359). . Package include: 1 x 7.4V 2600mah 25C Upgrade Battery .