Buy Anbee Tello WiFi Range Extender, Xiaomi WiFi Repeater 2 Amplifier Universal Wi-Fi Extender 300Mbps 802.11n Wireless WiFi Signal Extender for Tello and Tello EDU Drone Online at desertcartINDIA
Try this if you can't turn on your DJI Tello. This fixed my problem. - YouTube
3 Things to Try if Tello Drone is not Charging and not Turning on