... material to choose 4, 18mmX65m 18650 Lithium iron phosphate battery :1, long lifespan2, enviromental friendly3, different material ... to choose4, 18mmX65mBATTERY MODEL 18650 LiFePo4 BATTERY WEIGHT(g) ≤35 POWER DENSITY(W/kg)≥1140 ... held position meter, portable broadcasting station.2,MEDICAL EQUIPMENT:monitor, electorcadiograph,portable Type-B ultrasonic, Defibrillator, Ventilator, ...