As the most powerful AP battery, the AP 500 s battery allows professionals to tackle larger jobs with more power than other batteries in the AP System. Built with still exclusive power laminate cell technology, giving users up to a 2500 cycle life. The AP 500 S features 40% more power output and 20% more capacity than the previous model and the excellent power-to-weight ratio in the still AP System. The AP 500 S delivers maximum power while reducing user fatigue. It is compatible with most tools in the AP system to easily switch from one job to another. Additionally, this top-of-the-line professional battery offers still smart Power, allowing the motor's electronic control system to compensate for the reduction in voltage by increasing amperage, resulting in consistent power over entire running time.