DJI Matrice 350 Series TB65 Intelligent Flight BatteryThe DJI TB65 Intelligent Flight Battery is the high capacity flight battery for the DJI Matrice 350 RTK. Up to 55 minutes of flight time per battery pair (payload free), hot swap capability through the BS65 charging station, and built in self heating for cold weather operations. The M350 RTK requires two TB65 batteries per flight, working as a pair. You buy them in pairs. Real people answer the phone at (863) 224 6923. No hold queue, no offshore call