Symptoms
- Pressing the power button does nothing
- No lights or beeps from the mower or battery
- Battery may show charge on its own indicator
- Safety key or lever may not be seated correctly
Likely causes
- CommonBattery not fully insertedMany battery mowers won't power on unless the pack clicks fully into place.
- CommonFully discharged batteryA battery drained too low can trip its own protection circuit and appear dead.
- CommonSafety key or interlock not engagedMost battery mowers require a removable safety key and the operator presence bar held simultaneously.
- PossibleBattery contacts dirty or corrodedDebris on the contacts can prevent a good electrical connection.
What to do
- Remove and reinsert the battery, confirming it clicks or locks fully into the housing.
- Insert the safety key fully (if equipped) and hold the operator presence bar against the handle as required.
- Check the battery's own charge indicator; charge it fully if it's very low before testing again.
- Inspect and clean the battery contacts on both the pack and the mower with a dry cloth.
- Try a second battery, if you have one, to determine if the issue is the battery or the mower itself.
- If a known-good, charged battery still won't power the mower, the mower's control module may need service.
Tools and parts
- Dry cloth
Replacement battery packSearch: “cordless lawn mower battery replacement”
When to call a pro
If the mower won't power on with a confirmed good battery, a small engine or outdoor power equipment shop can test the control board.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.