... enviromental friendly 3, different 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 ... electric motor saw, grass cutter and so on. 18650 Lithium iron phosphate battery : 18650 Battery Series