Specifications: Voltage: 24V Capacity: 4000mAh Battery Type: Ni-MH Replacement Part: HILTI: 24V B24, B 24/2.0, B 24/3.0 Compatible Models: HILTI: SFL 24,TE 2-A,UH 240-A,WSC 55-A24,WSC 6.5, WSR 650-A,WSW 650-A Announcements: Please don't store the batteries for a long time, it need to be used at least once a month. If it's necessary, please using a cotton swab with alcohol to clean the battery and the charger metal contacts. After long-time using in your power tools, please fully rest the batteries. Before recharging the batteries, please make sure that the batteries have already cooled down. For safe transportation, the batteries have not been full charged, after three cycles (full charge and full discharge for three times), the batteries can reach the best condition.