Now Shipping : Da Pimp : Battery Charger, Desulfator and Tester, a photo by mikeysklar on Flickr.
Holy Scrap's latest widget is now shipping. Meet Da Pimp which can be used to recover, test and charge several types of batteries (Pb, NiCD, NiMH). The first video is up showing a dead power tool battery coming back from 0V after years of sitting in my office neglected. This charger is up to 60% more efficient than transformer based chargers. It uses capacitors to provide a constant current of .5A from 120V wall power. Combined with a bridge rectifier the AC voltage is converted into DC charging voltages. Unlike classic wall wart plugs Da Pimp is silent no noise, no heat and it fits in your pocket (awkwardly).
At Holy Scrap we use Da Pimp to charge our golf carts, car batteries, irobots and power tools. We also use Da Pimp as a tester when harvesting batteries from the local auto parts stores as it can tell us based on voltage reading which batteries have the least amount of sulfation.
This is a open source hardware project with all design files freely available.