Stihl AK20 36v Battery Delivering constant power to a range of Stihl Compact Cordless series garden machinery this 36v battery has been designed to be interchangeable across the range.The interchangeable nature of the battery across the range offers a more economical solution to homeowner maintenance, once you have the battery you can purchase a naked machine to bring down the buying costs. Manufactured to be lightweight and compact, this battery results in a lower tool weight during use to make this system a more versatile choice for homeowners. Designed for homeowners by professionals across the world, this compact range is ideal for use around the home and garden. 3.2Ah capacity this lithium ion battery offers impressive run times to all 4 machines currently available. Featuring 4 LED lights which indicates charge capacity allowing you to know when the battery is fully charged - this usually takes around 150 minutes to 100% or if you wish to part charge it takes approx 105 minutes to 80% charge.