I’m always complaining about all the chargers and wall warts I need to carry with me when going on a trip. This project, which can charge a pair of AA Nickel Metal Hydride (NiMH) or Nickel Cadmium (NiCd) cells using a laptop’s USB port for power, arose to address part of that problem. (By the way, if you want to lighten your laptop load, take a look at the MoGo Mouse.) Any USB port can supply 5V a
![Build a USB Powered AA NiMH and NiCd Battery Charger](https://cdn-ak-scissors.b.st-hatena.com/image/square/f56bfffa55c11d48a42b05157765b75013626562/height=288;version=1;width=512/http%3A%2F%2Fwww.stefanv.com%2Felectronics%2Fusb_charger_photos%2Ft-charger.jpg)