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The power of STIHL, now in a battery. STIHL Lithium-Ion batteries deliver the power to weight ratio you have been waiting for. The AK 20 is part of the STIHL AK Series, weighs only 2.7 lb and is great for applications where more run time is needed. Our batteries are engineered for minimal loss of charge during storage and performance that runs the power tool until the battery is depleted. Indicator lights show the battery level of charge, so you can plan your productivity accordingly. Inside the battery, sensors monitor temperature and automatically shut down if the battery ever becomes hot. Ready to take your battery power to the next level? Then switch to the STIHL battery products.