If your Sun Joe cordless grass trimmer + edger will not start even though the battery is charged, first check the battery installation, battery temperature, and starting sequence.
Article scope: This guide applies to Sun Joe cordless grass trimmer + edger models that use a removable battery and safety-lock starting system. Always check your model-specific operator's manual for the exact controls and battery requirements.
If the Battery Is Charged but the Trimmer Will Not Start
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Confirm the Battery Has Enough Charge
Check the battery charge level and make sure there is sufficient power to operate the trimmer.
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Remove + Reinstall the Battery
Remove the battery, then slide it back into the battery compartment until it clicks or snaps securely into position.
Make sure the battery is fully seated and secured to the tool before attempting to start the trimmer.
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Make Sure the Battery Is Not Overheated
Do not operate the trimmer with an overheated battery.
If the battery has become unusually hot, discontinue use until the battery is in a safe operating condition.
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Make Sure the Cutting Head Is Clear
Before starting the trimmer, make sure the cutting head is not contacting grass, the ground, or another object.
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Use the Correct Starting Sequence
On models equipped with a safety-lock button and trigger switch, press and hold the safety-lock button first.
While holding the safety-lock button, squeeze the ON/OFF trigger switch.
Once the trimmer starts, release the safety-lock button and continue holding the trigger switch for operation.
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Retest the Trimmer Once
After confirming the battery is charged, securely installed, and not overheated, try the correct starting sequence again.
If the trimmer still does not start, stop troubleshooting and contact Shop Joe Customer Support.
What If the Battery or Tool Appears Damaged?
Do not use a damaged or modified battery or tool. Do not open, disassemble, or attempt to repair the battery or internal electrical components.
The operator's manuals do not identify inspecting or adjusting individual battery prongs as a standard customer troubleshooting step. The approved no-start checks are to confirm battery charge, installation, temperature, and the correct starting procedure.
Check Your Model's Manual
Starting controls and battery requirements can vary by model. To review the instructions for your specific trimmer, visit the Shop Joe Product Manuals page and search using the complete model number from your unit.
Still Won't Start?
If your cordless trimmer + edger still will not start after completing these checks, contact Shop Joe Customer Support. Have your complete model number, serial number, and battery model number available.