DJI Agras T40/T30/T20P Battery Cooling Kit by Accurate Ag Drones

Includes 2-4 battery extension kit, power supply for fan control, and four built-in cooling fans. Charger and batteries sold separately. 

Two Battery Storage Dimensions 27"L X 14"W X 12"H

Each Additional Battery Extension Dimensions 7"L X 14"W X 12"H