BH2420 Makita 24v 20ah Ni MH Battery slide fit multicontact terminals ensure a tight connection to the power tool even under extreme vibration the CPU memory chip records usage history & transmits it to the Makstar charger to determine optimal charge paths forced air cooling system circulates air through the entire battery to maximise battery life fits all Makstar 24 volt Makita Cordless Tools Makita offer a range of batteries from 72v to 24v with chargers to match Fast chargers & incar chargers are also available Makita Nickel Metal Hydride Ni Mh batteries represent a technological breakthrough offering Significantly greater running time per charge No memory effect so batteries can be charged before they are fully discharged Environmentally friendly for disposal Ni MH batteries can be fitted to appropriate existing cordless tools to upgrade their performance Ni Mh chargers must be used The Makita Makstar 24v battery & charger system represents the pinnicle of battery technology featuring up to 33 Ah capacity batteries with a unique intelligent charging system