Battery voltage 18 V Battery capacity 5.2 Ah Ultra M technology: the intelligent battery management system extends the life of the battery with a 3-year warranty Patented charging technology AIR COOLED Electronic continuous monitoring of individual cells (ESCP) during charging for extra long service life Processor managed charge and discharge control Charge level indicator for constant charge level control Not equipped with a memory function Very low level of self-discharge, so it is possible to store them for a long time without losing the amount of charged energy