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Just how much leeway you have will vary from one tool to the next. I have a 14.4v cordless drill with dead NiCad batteries, so I thought I'd try powering it with an 18v lithium pack. The motor works fine at 18 to 20 volts, but the PWM power switch circuit burned out. I replaced it with a switch from another 18v drill with a smaller motor and now it works great. So if you try a higher voltage, be prepared just in case something in the electronics does burn out.
Concrete Metal Lathe
COBRA Naval Base Playset (made with upcycled plastic waste)
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Rain or Shine Solar Charger
Raygun - Steampunk Defense
The Microwave digital timmer hack.
Ultimate Parts Storage
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