Greenworks Battery Storage & Maintenance Guide

This guide covers how to store and maintain Greenworks lithium-ion tool batteries so they hold their charge longer, charge faster, and last for years instead of dying early. You’ll learn the correct storage temperature, charge level, cleaning routine, and what to do when a battery stops working.

What You’ll Need

• Soft, dry cloth (microfiber works best)
• Isopropyl alcohol (70% or higher) and cotton swabs
• Small brush (old toothbrush or paintbrush)
• Compressed air (optional)
• Marker or label tape (for dating batteries)
• Cool, dry storage location away from direct sunlight

Step-by-Step

1. Remove the battery from the tool after use. Leaving a battery seated in a tool allows small parasitic drains from the tool’s electronics or indicator lights to slowly discharge it. Pull it out and set it aside before storing the tool.
2. Wipe down the exterior. Use a dry cloth to remove dust, grass clippings, sawdust, or moisture from the battery casing. Pay attention to the seams and the vent slots. Do not use water or liquid cleaners on the battery body.
3. Clean the contact terminals. Inspect the metal prongs on the top of the battery. If they look dirty, tarnished, or have a film, dip a cotton swab in isopropyl alcohol and gently rub the contacts. Let them air dry completely before reinserting the battery. For stubborn debris, use a dry brush first.
4. Check the charge level. Press the charge indicator button on the battery. For storage, the ideal charge is between 30% and 50%. If it’s above 50%, use the tool briefly to bring it down. If it’s below 30%, charge it until the indicator shows roughly half.
5. Store in a cool, dry place. Place the battery in a location that stays between 40°F (4°C) and 70°F (21°C). A closet, shelf in a basement, or a drawer in a heated garage works well. Avoid storing on concrete floors in cold garages or near heat sources like furnaces, radiators, or water heaters.
6. Keep batteries away from metal objects. Do not store loose batteries in a drawer with coins, keys, screws, or other metal items that could bridge the terminals and cause a short circuit. If you must store them loose, place each battery in a separate plastic bag or use the original packaging.
7. Label the battery with the purchase date. Use a marker or label tape to write the month and year on the battery. This helps you track age and identify which batteries are getting old and may need replacement.
8. Recharge every 3-6 months. Lithium-ion batteries self-discharge slowly. Set a reminder to check stored batteries every few months. If the charge has dropped below 30%, charge them back up to 50% and return them to storage.
9. Rotate your batteries. If you have multiple batteries, alternate which ones you use. This prevents one battery from being constantly cycled while others sit idle, which can extend the overall life of your set.

Common Mistakes

• Storing at 100% charge. Keeping a lithium-ion battery fully charged for weeks or months stresses the cells and accelerates capacity loss. The 30-50% range is much better for long-term storage.
• Storing fully discharged. Letting a battery drop to 0% and sit that way can push cells below their minimum voltage, causing the battery to become permanently unchargeable. Always store with some charge.
• Leaving batteries in extreme heat. A hot car trunk, a sunny windowsill, or a garage that gets over 100°F (38°C) in summer will degrade the battery chemistry quickly. Heat is the number one killer of lithium-ion batteries.
• Storing in freezing temperatures. While cold slows degradation, freezing can damage the cells. If your garage drops below freezing in winter, move batteries indoors.
• Using water to clean. Water can seep into the battery casing and cause corrosion or short circuits. Use only dry cloths or alcohol on the terminals.
• Dropping or puncturing the battery. Physical damage can compromise the internal cell structure. If a battery is dented, cracked, or swollen, stop using it immediately.

Tips

• Use the original charger. Greenworks chargers are designed to match the battery’s voltage and charging profile. Third-party chargers may not charge correctly and can damage the battery.
• Charge in a moderate environment. Charging a very cold or very hot battery can reduce its capacity. If the battery is freezing, bring it inside and let it warm up before charging.
• Don’t charge immediately after heavy use. A battery that is hot from running a mower or blower should cool down for 30-60 minutes before being placed on the charger.
• Keep the charger contacts clean too. Wipe the charger’s terminals occasionally with a dry cloth to ensure a good connection.
• Store batteries upright. While not strictly required, storing them upright on a shelf reduces the chance of accidental contact with other objects.
• Consider a fireproof bag. If you store many batteries, a simple lithium-ion safety bag adds a layer of protection in the rare event of a cell failure.

Troubleshooting

• Battery won’t charge. First, check the charger – is it plugged in and is the indicator light on? Clean the battery terminals and the charger contacts. If the battery has been stored at 0% for a long time, the charger may not recognize it. Try leaving it on the charger for 30 minutes; some chargers will slowly revive a deeply discharged battery. If nothing happens, the battery is likely dead.
• Battery charges but dies quickly. This is a sign of age or damage. Check the label date. If the battery is more than 3-4 years old, capacity loss is normal. If it’s newer, you may have been storing it at full charge or in heat. There is no repair for this – replacement is the solution.
• Battery feels hot while charging. Slight warmth is normal, but if it’s too hot to touch, unplug it immediately. Let it cool completely, then try a different outlet. If it still overheats, stop using the charger and battery and replace them.
• Battery case is swollen or cracked. This is a serious safety issue. Do not attempt to charge or use it. Dispose of it at a battery recycling center that accepts lithium-ion batteries. Do not throw it in the trash.
• Charger light blinks red. This usually indicates a fault. Remove the battery, clean the contacts, and reinsert. If the blinking persists, try a different battery on the charger. If the charger works with another battery, the first battery is faulty.

Frequently Asked Questions

Can I store my Greenworks battery on the charger?
No, it’s not recommended. Leaving it on the charger keeps it at 100% and can stress the cells. Remove it once it’s charged.

How long will a Greenworks lithium battery last?
With proper care, most will last 3-5 years or 500-800 charge cycles. After that, capacity noticeably drops.

Is it okay to leave the battery in the tool in the garage?
It’s better to remove it. Temperature swings and humidity in a garage can degrade the battery faster than a stable indoor environment.

Can I use any Greenworks charger for any Greenworks battery?
No. Match the voltage. A 40V battery needs a 40V charger, and an 80V battery needs an 80V charger. Using the wrong one can damage the battery.

What does the blinking green light on the charger mean?
It typically means the battery is too hot or too cold to charge. Move both to a room-temperature area and wait for the light to become steady.

My battery is 5 years old and won’t hold a charge. Can I fix it?
No, lithium-ion cells degrade chemically over time. There is no user-serviceable fix. Recycle the old battery and buy a new one.

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