*5.0 Ah battery offers maximum run time for prolonged, heavy-duty applications *NEW Battery fuel gauge indicates approximate remaining battery power *NEW Battery Protection System provides Over-Discharge, *Temperature and Current Protection for enhanced performance, battery cycle life and overall battery life (when used with STAR marked tool) *Optimum Charging System utilizes 3 Active Controls (Current, Voltage and Temperature) to maximize battery life *Built-In Memory Chip communicates with Charger CPU to optimize the charging process based on the unique conditions of each battery