The Makita BL1040B 12 Volt 4.0Ah Lithium Ion Battery is a slide battery from Makita. They feature a higher capacity than cluster type batteries as well as individual cell monitoring and a battery protection circuit. The new multi-contact slide design ensures that stable contact is always made even under extreme levels of vibration. It is also very easy to keep an eye on the battery fuel gauge thanks to the 4 stage LED system. Makita original battery for 12v CXT Li-ion 'Slide' machines only - Compatible with 10.8v CXT Battery indicator with 4 step charge level Compatible with Makita DC10SA / DC10WC chargers Individual cell monitoring Battery protection circuit Low temperature performance