Cordless power tool battery replacements are expensive: you can easily spend $100 for a NiCd pack. [henal] decided to skip nickle-based cells and cut out the middleman by converting his old ...
That’s because he prototyped a way to use power tool batteries as an emergency source — basing his circuit on a 7812 linear regulator which got piping hot in no time flat. His next ...
Over time, you'll notice telltale signs a power tool battery requires replacement, which will only eat into your savings. You're better off attempting to extend the life of your batteries by ...