AK 20 Battery

Lithium-Ion 144 Wh battery

Compact Lithium-Ion battery for the AK System with a voltage of 36 V and a capacity of 144 Wh. Battery life depends on the device type. With charge level indicator (LED).

Versions Price
AK 20 £109.00*
  • Technical data
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    Technical data Value
    Battery weight kg 1.2
    Rated voltage (V) V 36
    Capacity Wh 1) 144
    Battery cell technology Lithium-Ionen AK-System

    1) Power capacity according to the specifications of the cell manufacturer. The actual power capacity available during operation is lower, to increase service life

  • Accessories
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    • AL 101 Standard charger

      230 V charger, recommended for STIHL AK System batteries. With operating mode indicator (LED) and passive battery cooling. Cable tie with Velcro strap.The charger can be wall mounted if required.

      The standard charger will fully charge an AK 10 battery in 95 minutes, AK 20 in 180 minutes and AK 30 in 205 minutes.

      The standard charger will fully charge an AP 100 battery in 100 minutes, AP 200 in 200 minutes, AP 300 in 250 minutes and AP 300 S in 300 minutes.

      Rated voltage V 220-240
      Weight kg 0.7
      Rated current A 0.7
      Charge time - AK 10 battery min 0) 95
      Charge time - AK 20 battery min 0) 180
      Charge time - AK 30 battery min 0) 205
      Charging time AP 200 min 0) 200
      Charging time AP 300 min 0) 250
      Charging current A 1.6
      Power output kW 0.1
      Protection class II

      1) Charge time in minutes to 100% capacity
      2) Charge time in minutes to 100 % capacity
      3) Up to 100 % capacity

      Versions Price
      AL 101 charger £40.00* Save and compare
      Save and compare
    • AL 300 Quick charger

      Quick charger for STIHL Lithium-Ion batteries. With operating mode indicator and active battery cooling.

      The quick charger will fully charge an AK 10 battery in 45 minutes, AK 20 in 55 minutes and AK 30 in 60 minutes.

      The quick charger will fully charge an AP 100 battery in 50 minutes, AP 200 in 55 minutes, AP 300 in 75 minutes and AP 300 S in 70 minutes.

      Weight kg 1.2
      Mains voltage V 220-240/50
      Charging time AR 1000 min 0) 180
      Charging time AP 200 min 0) 55
      Charging time AP 300 min 0) 75
      Charging time AR 2000 min 0) 250
      Charging time AR 3000 min 0) 300
      Rated voltage V 220-240
      Power output kW 0.3
      Weight kg 0) 1.2
      Rated current A 2.3
      Protection class II
      Charging current A 6.5

      1) Up to 100 % capacity
      2) 0

      Versions Price
      AL 300 quick charger £70.00* Save and compare
      Save and compare
    • Carry bag for STIHL battery accessories

      Soft bag for safe transport and storage of up to 2x AK or AP System batteries and 1x STIHL charger.

      Versions Price
      Carry bag for STIHL battery accessories £23.00* Save and compare
      Save and compare
    • Battery storage box - Small

      A space-saving and safe way to transport batteries and battery charger. Compatible with Sortimo L-BOXX and Sortimo Globelyst in-vehicle system. For four batteries or two batteries and an AL 300 or AL 500 charger.
      Dimensions: 45 x 37.4 x 17 cm

      Size 45 x 37.4 x 17 cm

      Versions Price
      Battery storage box - Small £45.00* Save and compare
      Save and compare
    • MSA 120 C-B Chainsaw tool only

      The light weight and superbly balanced MSA 120 C-BQ is perfectly suited to pruning back small branches around the garden and for cutting up smaller logs for the fire. Impressive run time and quick charging means you can work uninterrupted and for longer to get the job done.

      You can find videos showing you how to fill your machine with fuel and oil, fit bars and chains and start your chainsaw here.

      Cordless technology AK System
      Rated voltage V 36
      Recommended battery AK 20
      Weight kg 0) 2.7
      Oil tank volume cm3 110
      Bar length " 12
      Chain gauge 1/4" P
      Recommended bar length cm/inch 30 cm / 12"

      1) Without battery, with bar and chain

      Versions Price
      MSA 120 C-B - 30 cm / 12" £179.00* Save and compare
      Save and compare
    • HLA 56 Long-reach hedge trimmer

      Lightweight cordless long-reach hedge trimmer for cutting taller hedges and shrubs in your garden. Double-sided blades in a droplet shape to help guide hedge material towards the cutters, adjustable head for cutting at angles ranging from -45° to +90°, detachable shaft for easy transport. Carrying length: 115 cm.

      Weight kg 0) 3.8
      Vibration value, right m/s2 0) 1.5
      Vibration value, left m/s2 0) 1.5
      Sound power level dB(A) 0) 88
      Working time with AK 10 min 0) 0
      Run time with AK 20 battery min 0) 0
      Blade length cm 45
      Recommended battery AK 20
      Total length cm 210
      cutting capacity mm 16
      Stroke rate rpm 2,800
      Tooth spacing mm 30
      Battery working time with AK 10 min 0) 0-50
      Working time with AK 20 min 0) 0-100
      Battery working time with AK 30 min 0) 0-120
      Cordless technology AK System

      1) With blade, with handle, without protection, without battery
      2) K-factor according to DIR 2006/42/EC = 2m / s ²
      3) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
      4) Battery life times are approximate and may vary depending on application
      5) Run times may vary depending on the application
      6) Battery working times are approximate and may vary depending on application

      Versions Price
      HLA 56 Long-reach hedge trimmer tool only £209.00* Save and compare
      Save and compare
    • BGA 57 Blower tool only

      STIHL’s new lightweight cordless blower in the AK System is the successor to the BGA 56.


      Ideal for domestic users, the BGA 57 is perfect for clearing jobs around the garden. Featuring a new design in line with other new STIHL releases, the blower also has an improved balance and better blowing performance –all whilst retaining a low weight (2.2 kg) and sufficient working time for domestic use (22 min with AK 20 battery).


      The BGA 57 can be used without the need for ear protection. An adjustable blower tube allows you the choice of 3 lengths to suit the users height. The operators control handle is easy to use, with the trigger lockout designed symmetrically for right or left handed use.

      Rated voltage V 36
      Weight kg 0) 2.3
      Weight kg 2.3
      Blowing force N 0) 9
      Max. airspeed m/s 55
      Max. Airflow m³/h 0) 620
      Sound pressure level dB(A) 0) 79
      Sound power level dB(A) 0) 90
      Vibration value, right m/s2 0) 0.6
      Working time with AK 10 battery min 0) up to 10
      Working time with AK 20 battery min 0) up to 22
      Working time with AK 30 battery min 0) up to 27
      Cordless technology AK System

      1) Excluding battery
      2) Combination of airspeed and air throughput
      3) With round nozzle
      4) K-factor according to DIR 2006/42/EC = 2.5 dB (A)
      5) K-factor according to DIR 2006/42/EC = 2m / s ²
      6) Working times may vary depending on the application
      7) Working times may vary depending on application
      8) Working life times are approximate and may vary depending on application

      Versions Price
      BGA 57 tool only £119.00* Save and compare
      Save and compare
    • RMA 235 Lawn mower

      Lightweight, manoeuvrable cordless lawn mower for small lawns. Central cut-height adjustment, automatic eco mode, and flow-optimised blades ensure longer battery life. Adjustable-height bar with 2 settings and foldable for space saving transport and storage. Easy opening 30 litre grass collection box with fill level display, cutting width 33 cm / 13".

      Working area covered with recommended AK 20 battery is 300 m².

      Cutting width cm 33
      Cutting height mm 25-60
      Grass catcher box capacity l 30
      Overall weight kg 16
      Guaranteed sound power level LWAd dB(A) 89
      Measured workplace LpA dB(A) 76
      Vibration value ahw m/s² 1.8
      Device width cm 37
      Device height cm 108
      Cordless technology AK System
      Machine length cm 127
      Product weight kg 14
      Housing material Polymer PP
      Drive No

      Versions Price
      RMA 235 Lawn mower tool only £199.00* Save and compare
      Save and compare
    • RMA 339 C Lawn mower

      Lightweight, manoeuvrable cordless lawn mower for mid-sized lawns. Height adjustable and foldable comfort handlebars for comfortable work and to make emptying the grass catcher box much easier. Central cut-height adjustment, automatic eco mode, and flow-optimised blades ensure longer battery life. Easy opening 40 litre grass collection box with fill level display, cutting width 37 cm / 15".

      Working area covered with recommended AK 20 battery is 250 m².

      Housing material Polymer PP
      Drive No
      Cutting width cm 37
      Cutting height mm 20-70
      Grass catcher box capacity l 40
      Overall weight kg 19
      Guaranteed sound power level LWAd dB(A) 90
      Measured workplace LpA dB(A) 76
      Vibration value ahw m/s² 1.6
      Device width cm 43
      Device height cm 110
      Cordless technology AK System
      Machine length cm 122
      Product weight kg 16

      Versions Price
      RMA 339 C Lawn mower tool only £329.00* Save and compare
      Save and compare
  • Documents
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    Owners manuals

* Manufacturer's recommended retail price updated as of February 2021. The manufacturer's recommended retail prices are subject to change without notice.

The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.