This drone has a superb altitude hold flight. Eachine EX2H flight with C6000 camera on board. - YouTube
Eachine EX2H Drone 1080P 5G WiFi FPV Camera Brushless Motor Altitude Hold On/Off | eBay
Mini-Review Eachine EX2H Brushless RTF Drone & 1080p Camera Review - RC Groups
Amazon.com: sea jump 2PCS 7.4V 2700mAh 10C Battery for Hubsan H501S X4 H501C H501A H501M H501S W H501S pro Four-axis Aircraft Aerial Camera UAV Spare Parts : Toys & Games
Amazon.com: sea jump 2PCS 7.4V 2700mAh 10C Battery for Hubsan H501S X4 H501C H501A H501M H501S W H501S pro Four-axis Aircraft Aerial Camera UAV Spare Parts : Toys & Games