STIHL AK 20 Battery

Why buy the STIHL AK 20 36V 4.0Ah AK System Battery? Powerful 36V, 4.0Ah (144 Wh) Lithium-Ion battery Compatible with all cordless tools in the STIHL AK System Intelligent electronics deliver constant power output, regardless of charge level Clear 4-LED indicator displays the current state of charge Lightweight design for improved tool balance, weighing just 1.2 kg Cold start feature allows reliable operation in temperatures down to -20°C Reliable Power for the STIHL AK System The STIHL AK 20 is a versatile and durable 36V, 4.0 Ah Lithium-Ion battery, engineered to power the entire range of tools within the STIHL AK System. With a substantial energy capacity of 144 Wh, it provides long-lasting performance for homeowners tackling demanding gardening tasks. Its lightweight design of just 1.2 kg ensures that tools remain balanced and comfortable to use for extended periods. Intelligent and User-Friendly Design A key feature of the AK 20 is its integrated 4-LED charge indicator, which provides a clear and immediate display of the remaining power, so you always know when it’s time to recharge. Furthermore, STIHL’s intelligent battery management system ensures a constant level of power is delivered throughout the discharge cycle. Unlike other systems that lose performance as the battery drains, a STIHL tool will operate with consistently high power whether the battery is 100% or 1% charged. Advanced Technology for All Conditions The AK 20 battery incorporates a special cold start feature. This technology protects the cells in low temperatures by warming them in a controlled manner before delivering full power, enabling reliable operation in conditions down to -20° Celsius. The battery cells themselves are designed to be extremely durable and resistant, ensuring a very long service life even under intensive use. This battery is compatible with the STIHL AL 101, AL 301, and AL 501 charger units. Tool Compatibility The AK 20 battery provides optimal power for a wide range of tools, although performance may vary depending on the tool’s power demands. It delivers full power for models such as the MSA 60, HTA 50, HLA 56, FSA 60, BGA 57, SHA 56, RMA 235, and RLA 240. For higher-demand tools like the MSA 70, the battery will operate at a slightly reduced power output to ensure efficient operation. As an authorised UK dealer for STIHL, Sims Garden Machinery is more than just an online store. With a history stretching back over a century, our reputation is built on trust and expertise. When you purchase a genuine STIHL accessory like the AK 20 battery from us, you are guaranteed an authentic product backed by the full manufacturer’s warranty. Our trained sales staff in the Stratford-upon-Avon showroom are always available to offer expert advice, ensuring you get the right product for your machine and task. We provide full aftersales support, distinguishing us from box-shifters. Not sure which machine or part is right for you? Our team is here to help. Contact us today for expert advice. Technical Specification Rated voltage 36 V Max. voltage 40 V Battery cell technology LITHIUM-ION Battery weight 1.2 kg Rated capacity as per IEC 61960 4 A·h Rated cell capacity (as per manufacturer data) 2 A·h Number of LEDs 4 Width 118 mm Length 78 mm Why buy from Sims Garden Machinery? Authorised main dealer We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on. Real people, real support No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help. Expert advice — not pushy sales Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine. Established, independent family business We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth. Frequently Asked Questions What tools are compatible with the STIHL AK 20 battery? The AK 20 battery is compatible with all cordless power tools in the STIHL AK System. It provides full power for tools like the MSA 60 chainsaw, HLA 56 hedge trimmer, and RMA 235 lawn mower. For higher-demand tools such as the MSA 70, it delivers efficient, slightly reduced power. How do I know when the AK 20 battery needs charging? The STIHL AK 20 battery features a convenient charge level indicator with four integrated LEDs. By pressing the button on the battery, the LEDs will light up to show you the current charge status at a glance, so you always know when it’s time to recharge. Which charger should I use for the AK 20 battery? The AK 20 battery is designed to be charged using any of the chargers from the AK System range. This includes the standard AL 101 charger, as well as the faster AL 301 and AL 501 charger units. Can I use the STIHL AK 20 battery in cold weather? Yes, the AK 20 is equipped with a ‘cold start’ feature that makes it suitable for use in low temperatures. This technology carefully warms the battery cells before delivering full power, ensuring reliable performance in temperatures down to -20° Celsius. User Manuals / Downloads View STIHL Brochure