Tell us about yourself!
I was skeptical about this when I first saw it, but shortly afterward my wife reported that our Bissell Perfect Sweeper wasn't taking a charge anymore after using it several years. So I figured out how to open it up and took out the 7.2V NiCd battery pack. I have an old laptop power brick that puts out 19.5V at 6.5A, which sounded like a good zapper. So I jumpered it to the battery pack for a couple of minutes of Zap time, then tried charging it on the regular charger. Sure enough it took a charge and now runs fine. We'll keep an eye on it to see long it stays good. Thanks for the inspiration!
40W Bluetooth Portable Speaker (Improved Version!)
"when a coiled cable has a load it causes inductance. This can cause a build up of heat."I'm sorry, that's incorrect. Electrical heating is caused only by resistive (I^2 * R) power conversion, not by inductance. Inductance alone causes an induced AC voltage drop across the coil proportional to the AC current and the inductance, but not heating. The current and induced voltage are out of phase with each other and therefore no power conversion occurs.