The Remote Control used by the Matrice 30T has an internal battery. For long days, a WB37 battery can be inserted into the remote control to lengthen the use time of the remote. 

2 WB37 batteries come with the Drone Deer Recovery Kit. For 99% of pilots, additional batteries (beyond the 2 included with the kit) will not be required. 

The WB37 battery can be charged in the battery charging station (included in the Drone Deer Recovery Kit).

Technical Notes: 
This 2S 4920mAh battery has excellent discharge performance at low temperatures and charges quickly.