Skilsaw 7-1/4" TRUEHVL™ Cordless Worm Drive Saw Kit with 2 TRUEHVL™ Batteries, Diablo Blade (SPTH77M-22). The first and only cordless Worm Drive saw gives you legendary SKILSAW power to go anywhere. Powered by the TRUEHVL™ battery, designed specifically for our legendary Worm Drive saw. The brushless motor responds to challenging applications by boosting power and torque, and all-magnesium construction makes it lightweight and tough. TRUEHVL™ features a unique battery design that maximizes heat dissipation, patented Stay Cool™ technology that wraps each cell in a temperature controlling material, and intelligent power management that monitors and optimizes each cell. Together, these innovations deliver the ultimate in performance and an entire day of work on a fully charged battery. Go from zero to full charge in only 1 hour. Get all the power you need, from the ONLY cordless Worm Drive saw. SKILSAW has redefined power. Again.