To charge this mower, remove both 20V batteries and place them into the WORX dual-port charger. Fully charge both batteries together before mowing, then reinstall them securely into the mower. The Worx 14-inch cordless lawn mower uses two 20V Power Share batteries for 40V operation. WORX states that its included 4.0Ah batteries can recharge through the dual-port charger in about one hour. The mower can cover up to 5,500 square feet under suitable conditions.
Key Takeaways:
- Remove both batteries before charging them.
- Use the compatible WORX dual-port charger for Power Share batteries.
- Charge both batteries together for balanced mower performance.
- Use matching battery capacities whenever possible.
- Let hot batteries cool before attempting another charging cycle.
- Check charger seating and indicator lights during every charge.
Know Your Mower’s Battery Setup First
The WORX WG779 uses a 40V system built from two removable 20V batteries. Each battery supplies part of the mower’s required operating voltage. Therefore, one battery cannot power this 40V mower by itself.
The standard WG779 package includes two 20V 4.0Ah Power Share batteries. It also includes a dual-port charger designed to charge both batteries efficiently. The tool-only WG779.9 version does not include batteries or a charger.
Before charging, check your model number and battery specifications carefully. This simple check prevents compatibility mistakes and unnecessary charging problems.
What You Need Before Charging
Gather the mower’s two compatible batteries and its WORX dual-port charger. Also choose a dry, stable location with normal indoor room conditions.
Do not substitute an incompatible charger because battery systems require specific charging controls. WORX specifically instructs users to recharge batteries with the specified charger.
- Two compatible 20V Power Share batteries
- WORX dual-port battery charger
- Dry, stable charging location
- Clean battery terminals
- Accessible electrical outlet
Step-By-Step Charging Procedure
1. Stop the Mower Completely
Release the mower controls and wait until the blade completely stops rotating. Then remove the batteries before handling or charging them.
Removing the batteries also prevents accidental activation during maintenance. Never begin charging while batteries remain installed inside the mower.
2. Remove Both Batteries
Open the battery compartment and release each battery from its slot. Pull each battery out carefully without forcing the connector.
Inspect both batteries before charging them. Look for unusual swelling, visible damage, contamination, or damaged terminals.
3. Connect the Dual-Port Charger
Place the charger on a stable surface near an appropriate electrical outlet. Connect the charger to the outlet before installing the batteries.
Keep the charger and batteries away from moisture during charging. A clean, dry environment supports safer and more reliable charging.
4. Insert Both Batteries
Slide each 20V battery into a charger slot until it seats correctly. A properly seated battery should engage the charger’s connection without excessive force.
Charging both batteries together helps maintain balanced power for this dual-battery mower. WORX recommends fully charging both batteries at the same time.
5. Watch the Charger Indicators
Check the charger lights after inserting the batteries. The indicators communicate the charging status for each battery position.
If a charger light does not activate, first check whether the battery sits correctly. WORX specifically recommends ensuring proper battery seating when the charger remains unlit.
6. Allow the Batteries to Fully Charge
Leave both batteries connected until the charger indicates completion. The standard 4.0Ah batteries can recharge in roughly one hour with the dual-port charger.
Charging time can vary with battery condition, temperature, and charger behavior. Therefore, use the charger’s indicator rather than relying only on elapsed time.
7. Remove the Batteries After Charging
Disconnect the batteries after they reach full charge. Then remove each battery from the charger using its release mechanism.
Do not leave batteries connected indefinitely when you do not need them. Proper handling supports battery longevity and safer storage practices.
8. Reinstall Both Batteries
Open the mower’s battery compartment and insert both charged batteries. Push each battery firmly until it locks into position.
Close the battery compartment securely before starting the mower. The mower requires two batteries to operate correctly.
How To Tell When The Batteries Need Charging
The WG779 provides a battery power indicator for checking remaining battery capacity. Press the mower’s POWERTEST button before use or after mowing to check capacity.
During operation, the mower also displays battery capacity through its power indicator. One illuminated light means at least one battery needs charging.
Do not repeatedly mow with a heavily depleted battery. Continued operation in that condition can reduce battery life and performance.
Why You Should Charge Both Batteries Together
This mower depends on two batteries for its 40V operating system. Therefore, mismatched charge levels can limit practical performance during mowing.
WORX recommends using two batteries with the same capacity and charging both simultaneously. Different battery capacities can cause the mower to operate according to the lower common capacity.
For consistent mowing, pair batteries with matching specifications whenever possible. This approach also makes battery management much simpler between mowing sessions.
What To Do If The Charger Does Not Work
Charger Light Does Not Turn On
First, remove the battery and reinstall it firmly into the charger. WORX identifies incorrect battery seating as a primary check for an unlit charger.
Next, inspect the battery terminals for dirt or debris. Clean dirty terminals with a clean, dry cloth before trying again.
Charger Shows A Red Flashing Light
A flashing red charger indicator can occur when a battery becomes too hot. Remove the battery and allow it to cool below 42°C before charging again.
After cooling, reinstall the battery and check the indicator. If the problem continues, inspect the battery and charger for damage.
Battery Still Will Not Charge
Confirm that you are using the correct WORX charger for the battery system. Then check whether another compatible battery charges normally.
If one battery repeatedly fails while another works, the battery may require professional evaluation. Avoid opening or modifying the battery pack yourself.
Best Practices For Longer Battery Life
Keep batteries clean and dry between mowing sessions. Dirty terminals can interfere with proper electrical contact during charging and operation.
Allow hot batteries to cool before charging them. Normal room temperature provides the preferred operating environment for these lithium-ion batteries.
Also, remove batteries from the mower when you store the equipment. This reduces unnecessary battery exposure during extended periods without use.
How To Store The Mower Between Mowing Sessions
After mowing, remove both batteries and check their charge levels. Clean visible grass or debris from the mower before putting everything away.
Store batteries somewhere dry and protected from extreme temperatures. Keep them away from loose metal objects that could bridge battery terminals.
For longer storage periods, inspect the batteries periodically. Extended storage may require charging and discharging cycles before the batteries regain normal performance.
Charging Mistakes That Can Cause Problems
- Charging only one battery for a two-battery mowing session
- Using batteries with mismatched capacities
- Using an incompatible charger
- Charging a battery immediately after heavy use
- Ignoring a flashing red charger indicator
- Leaving damaged batteries in regular service
- Storing batteries in damp or excessively hot locations
- Ignoring poor battery seating inside the charger
Charging And Mowing Performance
A full charge does not guarantee identical mowing time during every session. Grass height, moisture, density, cutting height, and mowing technique can change energy consumption.
WORX rates the WG779 for up to 5,500 square feet on one charge under suitable conditions. Real-world coverage can vary significantly across different lawns.
Therefore, charge both batteries fully before demanding mowing sessions. This practice gives the mower its intended battery capacity from the start.
A Simple Charging Routine To Follow
| Step | Action | What To Check |
|---|---|---|
| 1 | Stop the mower | Blade has stopped completely |
| 2 | Remove batteries | Both batteries come out safely |
| 3 | Connect charger | Charger receives power |
| 4 | Insert batteries | Both batteries seat correctly |
| 5 | Monitor indicators | Charging indicators operate normally |
| 6 | Complete charging | Both batteries indicate full charge |
| 7 | Remove batteries | Batteries come out without force |
| 8 | Reinstall batteries | Both batteries lock securely |
Frequently Asked Questions
Can I charge only one battery for the WORX 14-inch mower?
No, charge both batteries together because the mower requires two batteries for operation.
How long does a WORX 14-inch mower battery take to charge?
The included 4.0Ah batteries can recharge in about one hour using the dual-port charger.
Can I use different battery sizes in the mower?
You should use two batteries with matching capacity for consistent performance and proper battery balance.
Why is my WORX charger flashing red?
A flashing red indicator can mean the battery became too hot, so let it cool below 42°C.
Can I leave the batteries on the charger after charging?
Remove fully charged batteries when they are no longer needed instead of leaving them connected unnecessarily.
Final Thoughts
Charging the WORX 14-inch cordless mower remains straightforward when you follow the two-battery system correctly. Remove both batteries, use the proper dual-port charger, and fully charge them together.
Most charging problems also have simple starting points, including poor seating, excessive heat, or dirty terminals. Follow the checks above before assuming that a battery or charger has failed.
For dependable mowing, make full charging part of your regular lawn-care routine. Check both batteries before every session, then start mowing only after both batteries reach a suitable charge.
