The Sun Joe 24V-SB10 cordless trimmer + edger family uses a dedicated 10-inch Mini SharperBlade cutting system instead of traditional trimmer string.
This guide applies to the 24V-SB10-LTE and 24V-SB10-CT.
SharperBlade Basics
What Is SharperBlade?
The 24V-SB10 uses Sun Joe's 10-inch patented self-sharpening SharperBlade cutting system.
The replacement Mini SharperBlade is made from durable nylon embedded in polymer. It provides a stringless alternative to a traditional trimmer line, so there is no trimmer string to feed, replace, untangle, or unjam.
What Can I Use It For?
The 24V-SB10 is a 2-in-1 trimmer + edger. The product information identifies it for:
- Trimming grass
- Cutting tough grass, thick thatch, and unwanted weeds
- Trimming along flowerbeds
- Edging along flowerbeds, sidewalks, and walkways
The 180° Twist-N-Groom rotating head converts the 24V-SB10 from a trimmer to an edger.
How Does the SharperBlade Self-Sharpen?
The product information identifies the Mini SharperBlade as having a self-sharpening cutting system.
There is no separate sharpening procedure in the 24V-SB10 operator's manual. Do not attempt to sharpen or modify the blade yourself.
Compatibility + Replacement Blade
Which SharperBlade Fits the 24V-SB10?
SB10-BLD-3PK Mini SharperBlade Replacement
The SB10-BLD-3PK is the approved 3-pack replacement Mini SharperBlade for:
- 24V-SB10-LTE
- 24V-SB10-CT
The SB10-BLD-3PK should not be treated as a universal cordless trimmer blade.
The replacement product listing specifically identifies 24V-SB10 CT + LTE models. For any other cordless trimmer, check that model's product information and operator's manual for the correct cutting part.
Blade Life + Care
How Long Does the SharperBlade Last?
The product page and operator's manual do not provide a fixed lifespan or number of seasons for the Mini SharperBlade.
Blade wear depends in part on how much pressure is applied while working near hard surfaces.
How Can I Help the Blade Last Longer?
When edging against concrete, brick, or stone, use minimal pressure and keep the blade just off the hard surface whenever possible.
The more pressure applied against a hard surface, the faster the blade will wear.
Can the SharperBlade Break?
Yes. Do not force the SharperBlade.
The operator's manual warns that high-speed impact against a hard surface can cause the blade to buckle near the center hub and tear.
Allow the blade to perform the cutting without applying unnecessary pressure.
Replacing the Mini SharperBlade
Do I Need Tools to Replace It?
The blade-replacement procedure in the 24V-SB10 operator's manual does not require a separate hand tool.
The SharperBlade is held in place by the screw knob and washer on the trimmer.
How Do I Replace the SharperBlade?
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Remove the Battery
Switch off the trimmer + edger, remove the battery, and wait for the machine to come to a complete stop.
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Remove the Worn Blade
Turn the screw knob counterclockwise and remove it to expose the SharperBlade and washer.
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Install the New SharperBlade
Position the new SharperBlade on the trimmer + edger with the washer placed in the middle as shown in the operator's manual.
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Secure the Assembly
Reinstall the screw knob and turn it clockwise to secure the blade.
Use the replacement cutting part specified for the 24V-SB10. The operator's manual warns against using steel blades or other unapproved cutting devices.
Have a Different Cordless Trimmer?
This article confirms Mini SharperBlade compatibility only for the 24V-SB10-LTE and 24V-SB10-CT.
Other Sun Joe cordless trimmers may use a different blade, spool, or cutting-line system. Confirm the complete model number before purchasing a replacement cutting part.
For complete operating, replacement, maintenance, and safety instructions, visit the Shop Joe Product Manuals page and search for 24V-SB10.
Need Help Finding the Correct Replacement?
If you are not sure which replacement cutting part fits your cordless trimmer + edger, contact Shop Joe Customer Support. Have your complete model number available.