DJI 3-Bay Battery Charging Hub for Tello Drone - Fast Charging Station for Multiple Batteries (Black, Model CP.PT.00000271.01) - Perfect for Travel, Aerial Photography & Extended Flight Sessions

Definitely a must have if you have multiple batteries. One thing to note is, although it does have 3 battery slots it only charges 1 battery at a time (indicated by flashing green light) during this time the other 2 batteries are in standby mode (solid yellow/orange light). Once 1 battery is fully charged (solid green light) the next battery in line will begin charging. By no means is this a bad thing since this unit charges a single battery faster than charging it via the tello (you must use a high output charger/brick to achieve this)