igh capacity 36 V, 8.8 Ah Lithium-Ion battery. The AP 500 S is the most powerful AP battery from STIHL. 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. It has an integrated Bluetooth® interface for STIHL connected, so just like our AR L backpack batteries, it can be linked to the STIHL connected system 5 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. Compatible with the AL 101, AL 300 and AL 500 charger unit.