Models BUC122 have been developed as the first Makita cordless chain saws powered by 3. 0Ah Li-ion battery (Not included). Features higher operation efficiency and powered by BL1830, 18V Li-ion battery. Technical specifications: Battery Type Lithium-ion. Voltage 18 v Cutting Capacity 115 mm Chain Oil Capacity 140 ml (cm³) Chain Gauge 0. 25 Chain Pitch 0. 050 Bar Size 115 cm Noise sound pressure 84. 6 dB(A) Noise sound power 92. 7 dB(A) Noise K factor 2 dB(A) Vibration K factor 1. 5 m/sec² Vibration: Cutting Wood 4. 3 m/sec² Vibration no load 4. 3 m/sec² Net weight 2. 6 kg. User benefits: Automatic chain oiling. Optional 2m extension pole available. 22 minute charge time with the air cooled Makstar Optimum Charging System. Lithium-ion batteries have greater life spans than their Ni-MH or Ni-Cad counterparts giving 430% greater run time. Lithium-ion's 40% weight saving means 18 volt power can be obtained by a battery that weighs the same as a 12 volt Ni-MH battery.