Symptoms
- Electric start does nothing, or just clicks
- Pull-cord backup works fine, confirming the engine itself is okay
- Battery indicator light dim or off
- Battery hasn't been charged or used in months
Likely causes
- CommonBattery naturally self-discharged during storageSmall sealed lead-acid batteries lose charge over weeks to months without use or maintenance charging.
- CommonLoose or corroded battery terminal connectionsCorrosion increases resistance and can prevent enough current from reaching the starter.
- PossibleBattery has reached end of lifeThese batteries typically last a few years and may no longer hold a charge even after recharging.
- PossibleCharging circuit on the generator not maintaining the battery between usesSome generators only charge the battery while running, so long idle periods still drain it.
What to do
- Try the recoil (pull cord) starter if equipped, to confirm the engine itself will run despite the dead battery.
- Inspect battery terminals for corrosion and clean them with a wire brush if needed.
- Charge the battery with an appropriate small-engine or automotive battery charger set to the correct voltage and rate.
- If it won't hold a charge after a full charging cycle, the battery likely needs replacement.
- Going forward, use a battery tender/maintainer during storage periods to keep it topped off.
- Confirm all battery cable connections are tight after reinstalling or replacing the battery.
- If a fresh, known-good battery still won't crank the engine, the starter motor or solenoid may need inspection by a small-engine shop.
Tools and parts
- Wire brush
- Battery charger or maintainer
Generator starting batterySearch: “generator electric start replacement battery”
When to call a pro
If a fully charged, known-good battery still won't crank the engine, have a small-engine shop check the starter motor and solenoid.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.