The Stihl AP500 8.8Ah 36V Battery is compatible with the tools in the STIHL PRO Cordless AP Power System. Featuring power laminate technology which means it has double the number of charging cycles of a typical STIHL AP system battery with cylindrical cells. With approximately 253 charging cycles per year 253 working days, excluding weekends and bank holidays in UK the battery will last close to 10 years without the typical capacity loss of the battery cells. The AP 500 S has an integrated Bluetooth interface for STIHL connected, so just like the AR L backpack batteries, it can be linked to the STIHL connected system and managed like a power tool. This allows you to see the charge status via the STIHL connected App and monitor its daily usage. The battery has an integrated LED charge indicator, clearly displaying as and when the battery needs charging too. It features a charge level indicator on the top with four LEDs so you can see how much charge you have left quickly and easily, at the touch of a button. Stihl batteries feature an intelligent battery management system - this clever technology gives a constant level of power whether the battery is 100 charged or 1 charged. Compatible with the AL 101, AL 301, AL 301-4 and AL 500 charger unit