Not Enough mAh - Long Range Fpv

A mix between Cold weather and me only focusing on the rssi lead me to running out of battery, and had to do a emergency landing. Need to pick a bigger battery next time.) Setup: DH Stamina 7" Frame BrotherHobby Avenger 2507-1850KV HQ Durable Prop 7x3.5x3V1S BetaflightF4 Flight Controller FVT 35A Cloud Phoenix 3-6S Blheli_32 ESC Tattu 1550 mAh 4s TBS Crossfire micro receiver V2 TBS Crossfire TX TBS Unify Pro 5.8GHz HV RunCam Micro Eagle FPV Camera Goggles:FatShark HDO TrueRC 5.8GHz X-AIR *2 Immersion Rapid Fire