Vpack 5V AA Single Cell Miniature 1.5V DC to 5V DC Converter with 1xAA Cell holder This is the ubiquitous battery holder with the integrated DC DC converter. It can supply 5V DC at 100mA from a single AA Cell. It looks like a normal battery holder, but on its back, there is a DC-DC switch converter circuit to generate a regulated 5.0V supply. And best of all, this regulated output voltage is maintained throughout the normal life of the battery, and at more than 80% efficiency. Now you don't have to design the voltage converter on your board, just grab our VPack and off you go. Provide an independent and stable power supply rail for microcontroller in RC applications. End the bad practice of sharing power between motors and the microcontroller. Price: (USD) $12.65 Shipping from: $1.76 In stock now