£129.00Original price was: £129.00.£119.00Current price is: £119.00. inc. VAT
The STIHL AK 20 is a powerful 36V, 4.0Ah Lithium-Ion battery designed for homeowners. Delivering 144Wh of consistent energy, it powers the full range of STIHL AK System cordless tools for demanding garden tasks.
Your garden is your own very personal project, and the tools you use need plenty of power, whilst also being easy to use. The STIHL AK System with interchangeable batteries offers a flexible range of tools for medium to large gardens. Domestic use, professional heritage. Ready for any challenge.
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.
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.
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About STIHL
We stock a wide range of STIHL garden tools at Sims Garden Machinery. STIHL is an industry renowned garden machine company, producing a wide range of lawnmowers, with both petrol and electric engines. STIHL lawnmowers are available in both push and self-propelling models. STIHL also produces heavy-duty chainsaws, hedge trimmers, and brushcutters, perfect for professional work. We also sell a range of STIHL leaf blowers, with both handheld and backpack models available. There is also a selection of STIHL clothing and accessories, including protective helmets and boots.Our range of STIHL garden tools can be delivered across the UK. If you have ordered gardening equipment, such as a lawnmower or chainsaw, a member of our team will assemble and demonstrate it for you upon delivery.
As a brand, STIHL's international reputation goes before it and the name is well known and respected by homeowners and gardening professionals alike.
STIHL has created and honed a number of innovations, particularly in the development of its chainsaws, one of its flagship products. STIHL chainsaws are well known and sought after for their power, sturdy construction, durability and user-friendly features!
£339.00Original price was: £339.00.£299.00Current price is: £299.00. inc. VAT
Shipping & Delivery
FREE PDI, DELIVERY & HANDOVER
We offer a free delivery service for all machines within a 30 mile radius. Not only that; we build, inspect and run up every machine prior to delivery. Making sure you get a fully functional machine that is set-up and ready for use. On delivery we will run through with you any instructions & maintenance advice so you are comfortable with your new machine.
NATIONAL DELIVERY
Each machine will be tested prior to delivery.
Orders will be sent out via either ThePalletNetwork or DHL insured service.
£99.00Original price was: £99.00.£89.00Current price is: £89.00. inc. VAT
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£60.00Original price was: £60.00.£55.00Current price is: £55.00. inc. VAT
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£142.00Original price was: £142.00.£129.00Current price is: £129.00. inc. VAT
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