Symptoms
- Runtime much shorter than when new
- Battery drains fast even at low speed setting
- Cold weather noticeably reduces runtime
- Battery charge percentage drops quickly right after full charge
Likely causes
- CommonBattery capacity degraded from age and cyclesLithium-ion batteries naturally lose capacity after hundreds of charge cycles.
- CommonCold temperature reducing battery performanceBattery chemistry is less efficient in cold weather, temporarily reducing runtime.
- CommonRunning at maximum speed settingHigh-power settings draw significantly more current and drain faster than eco or low modes.
- PossibleBattery not fully charged before useAn interrupted or incomplete charge cycle leaves less capacity than expected.
- Less commonBattery contact corrosion causing voltage dropDirty contacts can create resistance that wastes energy as heat.
What to do
- Fully charge the battery and confirm the charger indicates a complete charge before testing runtime.
- Test the blower at a lower speed setting to see if runtime improves significantly.
- If possible, warm the battery to room temperature before use in cold weather for better performance.
- Inspect battery contacts on both the pack and tool for dirt or corrosion and clean gently.
- Compare runtime against another battery of the same model if you have one, to isolate whether the pack itself is degraded.
- Keep track of roughly how many charge cycles the battery has been through, since capacity naturally fades over hundreds of cycles.
- If runtime has dropped dramatically and the battery is several years old, it likely needs replacement rather than repair.
Tools and parts
- None required for diagnosis
Replacement battery packSearch: “cordless leaf blower battery replacement”
When to call a pro
Lithium-ion battery packs are not typically repairable; replace an aged or damaged pack rather than trying to service it.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.