The AK 30 is the most powerful battery in the Stihl AK series, providing up to 80% longer run times than the AK 20 and allowing users to get more work done on a single charge. This lithium-ion battery is lightweight at 2.9 lb and features a good power-to-weight ratio using 36 V. It is compatible with any Stihl battery charger and is an affordable option for homeowners with suburban yards.