12S 4.0ah CXT with battery fuel gauge ( 4 stage LED). High Battery capacity. Individual cell monitoring. Battery protection circuit. Low temperature performance.Features and Benefits: Battery indicator with 4 step charge level Compatible with Makita DC10SA / DC10WC chargers For use with CXT ‘Slide’ machines only Individual cell monitoring Battery protection circuit Low temperature performanceNote:Inline with makita’s brand update the 12V Max BL1041 battery pack replaces the 10.8V BL1040. Both batteries are identical and have the same compatibility with all 10.8V / 12V MAX CXT tools