5pcs 3.7V 600mAh 15C LiPo Battery for Quadcopter Syma X1 WLtoys V929 V959 V222 compatible with Quadcopter Syma X1 WLtoys V929 V959 V222 Upgraded battery Capacity: 600mAh Size : 58 x 19 x 7mm 5 pieces It won't fit perfectly, but worth for longer fly time!