But let’s say you have a cordless tool, and its battery is failing. Can you fix the battery? Of course you can. You are Hackaday readers, you’ll all be aware that inside almost all cordless ...

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 ...

Read more: 27 Great Tech Gifts Under $100 In my experience, a drill battery can often be a weakness among affordable cordless drill ... light maintenance and repair or even hang your brand-new ...