How to Charge a Worx 20V Battery Properly? | Match The Charger

Charging a Worx 20V battery properly means pairing it with the exact charger Worx specifies for that battery model, then charging it dry, ventilated, and within the manual’s temperature range.

A mismatched charger is the difference between a battery that lasts years and one that swells, vents, or starts a fire. Worx builds its 20V PowerShare packs as matched systems, and its manuals say a charger built for a different battery type creates a fire risk. The steps below follow Worx’s documentation; the compatibility notes cover the part most people get wrong: two packs both labeled “20V” are not automatically interchangeable on the same charger.

What The Proper Charging Steps Look Like

The correct sequence is inspect, match, position, charge, and disconnect — in that order, every time.

1. Pull the battery from the tool and inspect everything. Check the housing, charger, metal contacts, cord, and vents for cracks, dirt, corrosion, or moisture. If anything looks damaged, do not charge it.
2. Confirm the charger is the one Worx specifies for that battery model. Check model numbers on the labels rather than assuming from voltage. Worx’s charger instructions state the charger and battery are matched and prohibit use with other packs or non-rechargeable batteries.
3. Set the charger on a dry, flat, well-ventilated surface. Keep it away from combustibles and never cover the vents. Worx prohibits outdoor use and warns against water, humidity, and unsupervised charging.
4. Slide the battery in the correct way. It inserts only one direction, so never force it. The red LED should light while charging.
5. Plug into the appropriate power supply and let the cycle finish. Follow the LED behavior for your charger model.
6. Disconnect from power and pull the battery when complete, and any time the charger isn’t in use.

Which Charger Fits Which Worx 20V Battery?

Compatibility runs off model numbers, not the “20V” label. Worx lists WA3742, WA3769, WA3881, WA3770, WA3884, and WA3835 as compatible chargers for its 2.0 Ah PowerShare battery, while a separate Worx battery page names WA3732, WA3835, WA3764, and WA3875 for the applicable WA3575 pack. The overlap matters: check your battery’s label against the charger list in its manual before buying or swapping.

PowerShare packs can be combined to run tools rated at 20 V, 40 V, or 80 V, which feeds the myth that any charger handles any pack. It doesn’t — voltage alone never confirms compatibility. For spare packs versus faster chargers, this breakdown of tested Worx 20V batteries and chargers sorts options by charge times and kit contents.

Where Charging Goes Wrong

Almost every failure traces to one of five mistakes, and Worx’s manuals flag each one. A charger suitable for another battery type can create a fire risk, per the WA3769 charger manual, and that risk climbs with generic or wrong-voltage units.

• Wet or enclosed spots. Water, humidity, blocked vents, and flammable clutter are prohibited in Worx’s charger safety instructions.
• Charging a hot pack. Let a warm battery cool first; charging outside the manual’s temperature range damages cells and raises fire risk.
• Ignoring an abnormal battery. Swelling, leaking, odd odors, or excess heat mean stop and follow Worx service guidance.
• Charging non-rechargeable batteries. The charger is built for Worx packs only.
• Leaving it plugged in indefinitely. Unsupervised charging is called out in the manuals; disconnect when the cycle ends.

What To Do If The Battery Will Not Take A Charge

A pack that shows nothing usually has a connection or temperature issue. Wipe the contacts and reseat the pack firmly to the click. Let a warm battery cool to room temperature and retry. Confirm the outlet works and the charger light behaves as the manual describes. If it stays silent after a full cool-down on a known-compatible charger, contact Worx service — don’t force it.