Amazon.com: 2PCS 7.4V 2700mAh Drone Lithium Battery with 2 in 1 Charger for Hubsan x4 H501S Pro H501A H501C H501S H501M H501S W H501S pro Brushless Quadcopter Drone : Toys & Games
Amazon.com: 7.4V 2700mAh li-po Battery for Hubsan H501S H501A H501C RC Drone H501S-14 Battery H501S Battery 2 Pack with EC2 Plug Battery Parallel Cable : Toys & Games