Stihl AK20 Lithium-Ion Battery User Manual

1. Introduction

This manual provides essential instructions for the safe and efficient use, setup, operation, and maintenance of your Stihl AK20 Lithium-Ion Battery. Please read this manual thoroughly before using the battery and keep it for future reference. The Stihl AK20 is a compact 36V, 118Wh lithium-ion battery designed for the Stihl Compact cordless power system, featuring an LED charge level indicator.

2. Safety Information

Always observe the following safety precautions to prevent injury and damage to the battery or connected equipment.

Read all instructions: Before using the battery, read all instructions and cautionary markings on the battery, the charger, and the product using the battery.
Charging: Only charge the battery with Stihl-approved chargers (AL 101, AL 100, AL 300, AL 500). Using an incompatible charger may result in fire, electric shock, or injury.
Avoid short circuits: Do not short-circuit the battery terminals. This can cause severe burns or fire.
Temperature: Do not store or use the battery in temperatures exceeding 40°C (104°F) or below -10°C (14°F). Extreme temperatures can damage the battery and pose a fire risk.
Water exposure: Do not expose the battery to water or rain. If the battery becomes wet, do not use it.
Damage: Do not use a damaged or modified battery. Damaged batteries may exhibit unpredictable behavior resulting in fire, explosion, or risk of injury.
Disposal: Dispose of batteries responsibly according to local regulations. Do not dispose of batteries in fire.
Children: Keep batteries out of reach of children.

3. Setup

3.1 Unpacking

Carefully remove the Stihl AK20 Lithium-Ion Battery from its packaging. Inspect the battery for any signs of damage. If any damage is observed, do not use the battery and contact your dealer.

Stihl AK20 Lithium-Ion Battery, front view

Figure 1: Front view of the Stihl AK20 Lithium-Ion Battery, showing the Stihl logo and LED charge indicator.

3.2 Initial Charging

Before first use, fully charge the AK20 battery. Connect the battery to a compatible Stihl charger (AL 101, AL 100, AL 300, or AL 500). The charger's indicator lights will show the charging status. Refer to your charger's manual for specific charging instructions.

3.3 Inserting the Battery into a Tool

Align the battery with the battery compartment of your compatible Stihl cordless power tool. Push the battery firmly into the compartment until it clicks into place. Ensure the battery is securely seated before operating the tool.

Stihl AK20 Lithium-Ion Battery, top view

Figure 2: Top view of the Stihl AK20 Lithium-Ion Battery, showing the connection terminals and warning labels.

4. Operating the Battery

4.1 Checking Charge Level

The Stihl AK20 battery features an LED charge level indicator. Press the button next to the LEDs to display the current charge status. The number of illuminated LEDs indicates the remaining charge:

4 LEDs: Full charge
3 LEDs: Approximately 75% charge
2 LEDs: Approximately 50% charge
1 LED: Low charge, recharge soon
Flashing LED: Battery is critically low or has an error.

4.2 Using with Compatible Tools

Once inserted and fully charged, the AK20 battery is ready to power your compatible Stihl cordless tools. The battery life will vary depending on the specific tool and the intensity of use. Always refer to your tool's instruction manual for optimal usage guidelines.

5. Maintenance

5.1 Charging Procedures

Always charge the battery in a well-ventilated area, away from flammable materials. Do not leave the battery on the charger indefinitely after it is fully charged. Disconnect the battery from the charger once charging is complete to prolong battery life.

5.2 Storage

For optimal battery longevity, store the AK20 battery in a cool, dry place, ideally between 10°C and 20°C (50°F and 68°F). Store the battery with a partial charge (around 50-75%) if it will not be used for an extended period. Avoid storing fully discharged or fully charged batteries for long durations.

5.3 Cleaning

Keep the battery terminals clean and free from dirt or debris. Use a dry, soft cloth to wipe the battery. Do not use solvents or abrasive cleaners. Ensure no moisture enters the battery housing.

Stihl AK20 Lithium-Ion Battery, bottom view with specifications

Figure 3: Bottom view of the Stihl AK20 Lithium-Ion Battery, showing product labels and specifications.

6. Troubleshooting

Problem	Possible Cause	Solution
Battery not charging	Charger not plugged in Battery or charger is damaged Incorrect charger used Battery too hot or too cold	Ensure charger is properly connected to power outlet. Inspect battery and charger for visible damage. Do not use if damaged. Use only Stihl-approved chargers (AL 101, AL 100, AL 300, AL 500). Allow battery to reach room temperature before charging.
Battery not powering tool	Battery is discharged Battery not properly inserted Battery or tool is damaged	Check charge level and recharge if necessary. Ensure battery is fully seated and clicked into place. Inspect battery and tool for damage.
LED indicator flashing rapidly	Battery error or malfunction Battery overheating	Remove battery from tool/charger and allow it to cool down. If problem persists, discontinue use and contact Stihl service.

7. Specifications

Feature	Detail
Model Name	AK20
Brand	Stihl
Battery Type	Lithium-Ion
Voltage	36 Volts
Capacity	118 Wh (Watt-hours)
Battery Cell Composition	Lithium Ion
Reusability	Rechargeable
Compatible Chargers	AL 101, AL 100, AL 300, AL 500
LED Indicator	Yes, charge level indicator
Item Weight	1.2 Kilograms
Item Dimensions (LxWxH)	3.94 x 3.94 x 3.94 inches
UPC	886661117789

8. Warranty & Support

For information regarding the warranty of your Stihl AK20 Lithium-Ion Battery, please refer to the warranty card included with your purchase or visit the official Stihl website. For technical support, service, or to purchase replacement parts, please contact your authorized Stihl dealer or Stihl customer service directly. Keep your proof of purchase for warranty claims.

Stihl AK20