Troubleshooting Common Lithium-Ion Lawn Mower Issues

If you rely on your SENIX lithium-ion mower to keep your lawn sharp and your weekends productive, you’re not alone. These cordless mowers are known for clean cuts, quiet operation, and zero emissions. But like any machine, even the best ones can have off days. Before you assume the worst, many issues have simple solutions, and a little know-how can save you time, stress, and even a trip to the service shop.

Problem: My mower won’t start. You press the button... and nothing. It’s frustrating , but it’s often not serious. Here’s what could be happening: Common reasons: Battery is low or not properly connected The power switch or wiring is loose Incorrect startup procedure Clogged with grass or stuck blade Battery temperature is too high What to do: Make sure the battery is charged and firmly clicks into place Inspect for any loose wires or blown fuses Most cordless mowers require pressing a safety button while pulling the start lever.(Refer to your user manual) If the blade or wheels are jammed, the motor might not start due to built-in safety protection. Let the battery return to room temperature and try again.

Possible Causes:

Battery not charged or dead

Battery not inserted correctly

Safety key missing or not engaged

Faulty power switch or wiring

Solutions:

Fully charge the battery

Ensure battery clicks into place securely

Insert the safety key properly

Check for blown fuses or loose wires

Possible Causes:

Old or degraded battery

Grass too thick or wet (causing overload)

Battery not fully charged

Solutions:

Replace an old or failing battery (typically lasts 2–5 years)

Mow during dry conditions and regularly to avoid overload

Confirm battery reaches full charge before use

Problem: The mower shuts off mid-use.If your mower stops after a few minutes of work, don’t panic — it’s often a built-in safety feature. 

Possible reasons: The motor overheated The grass is too dense The battery got jostled loose The battery is completely drained Solutions: Let the mower cool for 10–15 minutes before restarting Raise the cutting deck to reduce strain Remove and reseat the battery firmly Recharge or replace the battery.

Solutions:

Let the Lithium-Ion Lawn mower cool down for 10–15 minutes

Raise the cutting height for tall grass

Remove and reseat the battery

Recharge or swap in a fresh battery

Problem: The blades won’t spin.

Possible Causes:

Debris stuck in blade or under deck

Blade control lever not engaged

Motor failure

Solutions:

Disconnect power and safely remove debris

Make sure blade engagement switch/lever is active

If motor issue persists, seek professional repair

Possible Causes:

Dull or damaged blade

Low battery power

Wet or overly thick grass

Solutions:

Sharpen or replace the blade

Use a fully charged battery

Mow in optimal conditions (dry grass, moderate height)

Problem: The battery won’t charge.You plug it in, but no lights or progress? Troubleshoot: Try a different wall outlet Check the charger — it might be faulty Clean the battery terminals with a dry cloth Replace the battery if it’s no longer holding a charge If your battery feels warm or swollen, don’t force it — replace it. Safety comes first.

Possible Causes:

Faulty charger or power outlet

Dirty or corroded battery terminals

Damaged battery

Solutions:

Try a different charger or outlet

Clean battery terminals with a dry cloth

Replace battery if it's defective or no longer holds charge

Problem: Strange noises or vibrationsYour mower suddenly sounds like a jackhammer? That’s not normal. Check for: Loose bolts or fasteners Damaged or unbalanced blades Foreign objects stuck in the housing Fix it: Tighten all visible bolts Remove the blade and inspect for chips or warping Look for anything stuck around the blade shaft or under the deck.