Key Features:
- Chargers all the STIHL AK and AP Batteries
- Lower cost charger with slower charge time
- Charging level indicator
- Turns off automatically
Home Delivery - $8 on all online orders. Delivery timeframe is 2 to 5 working days.
Click & Collect - FREE. Includes assembly of tools prior to collection. The store will contact you when your order is ready.
We will happily accept returns or exchanges up to 14 days after the date of purchase, provided the products are in their original condition and packaging. Click here to view our full Returns Policy
All STIHL tools purchased online are covered by the same comprehensive warranty as those bought in‑store, giving you complete peace of mind no matter how you shop.
Battery-Powered Tools, Batteries and Chargers
Petrol‑Powered Tools (exluding WaterBlasters and Lawnmowers)
Accessories & Cutting Attachments
Click here to find out more about the STIHL Warranty, including timeframes for, Hire and Government use.
The STIHL AK 20 Compact Battery is a popular choice for homeowners wanting longer runtimes and dependable cordless power for regular garden maintenance. Delivering 144 Wh of energy in a compact, lightweight design, the AK 20 is ideal for a wide range of compatible STIHL AK System tools, including hedge trimmers, line trimmers, combi tools and pole saws. With an integrated LED charge level indicator and the ability to tackle larger jobs with fewer charging breaks, the AK 20 helps you work more efficiently around your property.
✓ Fits AK System Tools
✓ Interchangeable across the AK range (For maximum performance and runtime in higher-powered tools such as chainsaws, blowers and lawnmowers, STIHL recommends the AK 30 S battery.)
✓ Works with AL 101 & AL 301 Chargers
Charge time with AL 101 Charger: 180 minutes, or to charge it up to 80%, it takes 135 minutes
Charge time with AL 301 Charger: 55 minutes, or to charge it up to 80%, it takes 35 minutes
Battery life depends on the tool type. Refer to the battery run times listed on each tool or the run time chart below.
Rated voltage (V)
36
Max. voltage (V)
40
STIHL Battery System
AK
Weight (kg)
1.2
Energy (Wh)
144
Rated Capacity (Ah)
4
Number of LED
4
Battery Cell Technology
Lithium-ion
Warranty
5 years



Q: What tools is the STIHL AK 20 battery compatible with?
A: The STIHL AK 20 battery is compatible with most tools in the STIHL AK Battery System, including chainsaws, line trimmers, hedge trimmers, lawnmowers, blowers, pole pruners, vacuums and pressure washers. Its increased capacity compared to the AK 10 makes it a popular choice for users wanting longer runtimes across a wide range of garden tools. It is not recommended for some chainsaws and lawnmowers that require higher power to perform at their best.
Q: How long does the STIHL AK 20 battery last?
A: Runtime varies depending on the tool being used and the application. The AK 20 offers approximately double the energy capacity of the AK 10, making it ideal for medium to larger residential gardening tasks where longer working times are required.
Q: How do I know when the battery needs charging?
A: The AK 20 features an integrated LED charge level indicator that allows you to quickly check the remaining battery capacity at any time.
Q: What charger do I need for the STIHL AK 20 battery?
A: The STIHL AK 20 battery is compatible with STIHL AL series chargers, including the AL 101 Standard Charger and AL 301 Fast Charger.
Q: Is the STIHL AK 20 battery lightweight?
A: Yes. Weighing approximately 1.2 kg, the AK 20 offers an excellent balance between battery capacity and weight, providing longer runtimes while remaining comfortable to use.
Q: Who is the STIHL AK 20 battery for?
A: The AK 20 is ideal for homeowners and lifestyle block users who need longer runtimes than the AK 10 provides. It is well suited to regular garden maintenance and powering higher-demand AK System tools.
Q: How long does it take to charge the AK 20 battery?
A: Charging times depend on the charger being used. With the STIHL AL 101 charger, the AK 20 reaches 80% charge in approximately 135 minutes and a full charge in around 180 minutes. Faster charging is available with STIHL fast chargers.
Q: Can I leave the AK 20 battery on the charger?
A: Once charging is complete, the charger automatically switches off.
Q: What is the Warranty period?
A: Comes with a 5-year domestic warranty and ongoing support from your local STIHL SHOP.