STIHL AK 20 battery for the 36V AK System
The STIHL AK 20 battery is a versatile 36V lithium-ion battery designed for compatible garden tools in the domestic STIHL AK System. With a rated capacity of 4.0Ah and an energy content of 144Wh, it offers a practical balance between working time, power and battery weight.
At 1.2kg, the AK 20 is a useful middle-weight option for homeowners who use several STIHL cordless tools. It is suitable for a wide range of AK System lawn mowers, grass trimmers, hedge trimmers, leaf blowers, pole pruners, chainsaws and other garden machinery.
Please note: this listing is for the STIHL AK 20 battery only. A battery charger is not included.
Key features of the STIHL AK 20
- 36V AK System battery: designed for compatible domestic STIHL AK System garden tools.
- 4.0Ah rated capacity: a balanced option for general garden maintenance and regular cordless-tool use.
- 144Wh energy content: provides twice the stored energy of the lighter 72Wh AK 10 battery.
- Four-LED charge indicator: press the button on the battery to check the approximate remaining charge before starting work.
- Constant power: intelligent battery management helps maintain consistent tool performance as the battery discharges.
- Cold-start function: protects the battery cells and enables controlled operation in very cold conditions.
- Interchangeable AK platform: one compatible battery can be shared between multiple STIHL AK System tools.
STIHL AK 20 technical specifications
| Specification | STIHL AK 20 |
|---|---|
| Battery system | STIHL AK System |
| Battery technology | Lithium-ion |
| Rated voltage | 36V |
| Maximum voltage | 40V |
| Rated capacity | 4.0Ah |
| Energy content | 144Wh |
| Battery weight | 1.2kg |
| Charge indicator | Four integrated LEDs |
| Approximate full charge with AL 101 | 180 minutes |
| Compatible chargers | STIHL AL 101, AL 301 and AL 501 |
| Manufacturer part number | 45204006535 |
| GTIN/EAN | 0886661748433 |
| Package contents | One STIHL AK 20 battery; charger sold separately |
Which STIHL tools are compatible with the AK 20?
The AK 20 is designed for tools in the STIHL AK System domestic cordless range. This includes compatible cordless lawn mowers, hedge trimmers, grass trimmers, blowers, chainsaws, pole pruners and Kombi tools.
Popular compatible products include:
- STIHL FSA 60 R cordless strimmer
- STIHL HSA 60 cordless hedge trimmer
- STIHL RMA 243 cordless lawn mower
- STIHL RMA 248 cordless lawn mower
- STIHL BGA 60 cordless leaf blower
Important compatibility information
Although the AK 20 fits a broad selection of AK System tools, it does not deliver identical performance in every machine:
- STIHL MSA 70: compatible, but the tool operates at reduced power with the AK 20.
- STIHL REA 60 PLUS: compatible, but the tool operates at reduced power with the AK 20.
- STIHL MSA 80: the AK 20 cannot be used with this machine.
Check the battery recommendation for your individual machine before ordering. For help choosing the correct battery, contact the Masseys garden-machinery team on 01283 217133.
STIHL AK 10 vs AK 20 vs AK 30 S
The AK 20 sits between the lightweight AK 10 and the higher-capacity AK 30 S. The best choice depends on the tool, required working time and the total weight you are comfortable carrying.
| Battery | Capacity | Energy | Weight | Best suited to |
|---|---|---|---|---|
| STIHL AK 10 | 2.0Ah | 72Wh | 0.8kg | Shorter, lighter garden jobs where minimum tool weight is important |
| STIHL AK 20 | 4.0Ah | 144Wh | 1.2kg | General domestic use and a balance between runtime and weight |
| STIHL AK 30 S | 5.0Ah | 180Wh | 1.3kg | Longer working periods and more demanding compatible AK System tools |
Masseys recommendation: choose the AK 20 when you want a versatile battery for several everyday AK System tools without moving up to the additional capacity and weight of the AK 30 S. For larger lawn mowers and particularly demanding machines, check whether STIHL recommends the AK 30 S.
Charging the STIHL AK 20 battery
The AK 20 can be charged using the STIHL AL 101, AL 301 or AL 501 charger.
- AL 101: standard charger suitable for normal domestic use. A full AK 20 charge takes approximately 180 minutes.
- AL 301: faster charger with active battery cooling for reduced charging time.
- AL 501: high-speed charger for users who need the shortest practical turnaround between jobs.
View the available STIHL battery chargers at Masseys.
Why buy your STIHL AK 20 from Masseys?
- Authorised STIHL dealer: buy genuine STIHL batteries, chargers and cordless garden tools from an established specialist retailer.
- Expert compatibility advice: our garden-machinery team can help match the correct battery and charger to your STIHL tool.
- Wide STIHL range: compare compatible tools, batteries and chargers in one place.
- Physical store: visit Masseys at 129 Swadlincote Road, Woodville, Swadlincote, Derbyshire, DE11 8DA.
Frequently asked questions
Does the STIHL AK 20 battery include a charger?
No. This product contains one STIHL AK 20 battery. The charger is sold separately unless a battery-and-charger starter set is specifically selected on another listing.
Which chargers work with the STIHL AK 20?
The current compatible chargers are the STIHL AL 101, AL 301 and AL 501.
How long does the STIHL AK 20 take to charge?
A full charge takes approximately 180 minutes with the AL 101 standard charger. The AL 301 and AL 501 provide faster charging.
Does the AK 20 fit every STIHL AK System tool?
It fits a broad range of AK System tools, but performance differs between machines. The MSA 70 and REA 60 PLUS operate at reduced power with the AK 20, while the AK 20 cannot be used with the MSA 80.
Can the AK 20 be used in STIHL AP or AS System tools?
No. The AK 20 is designed for the STIHL AK System. STIHL AS and AP tools use different battery platforms and are not interchangeable with AK batteries.
What is the difference between the AK 10 and AK 20?
The AK 20 stores 144Wh of energy compared with 72Wh in the AK 10, so it normally provides more working time in a compatible tool. The AK 20 weighs 1.2kg, while the lighter AK 10 weighs approximately 0.8kg.
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