Makita BL4040 40V 4.0Ah XGT Li Ion Battery 750W grinder 100 Sound Pressure Level 89 road maintenance tools 100 Sound Pressure Level 89 dB(A) Sound Power Level 100 dB(A) Vibration Level Chiseling: 15 Capacity Steel : 13mm (1 2") Wood : 38mm (1 1 2") Masonry : 13mm (1 2") Impacts per minute (ipm) Hi : 0 22 191B30 5 Cell Li Ion Voltage(V) 40Vmax Capacity(Ah) 4 Energy capacity(Wh) 144 Charging time(min) 45 (Full charge) with DC40RA 31 ( 80% Practical charge) with DC40RA Adapted for Forced air cooling system Yes Individual cell monitoring – Battery protection circuit – Low temperature performance (℃) – Water resistance Yes Battery fuel gauge Yes Net weight(kg) 1 Net weight(lbs) 2 · More detailed information on usage history