I've built a homebrew mr-11 triple cree kit, and I think I bought a battery that is bigger than I needed to drive it for most of my uses. From what I can tell, my 14.4 5000AH bottle battery will give me something like 7 hours of continuous light driving 3 crees at 1000ma, so for my winter commutes, I have enough power to do rides for two to four days light for my evening commute, which means I have a lot of extra power left at my disposal for other uses.
Since it is winter, I would like to wire up the battery to a pair of heated socks/insoles to make the commute more comfortable. Most of the socks I've seen run on either a D cell or a pair of AAs, which means that I need to convert the 14.4+v of the bottle battery down to 1.2 to 3 volts depending on the sock/insole. The problem is that I am an absolute electronics novice when it comes to resistors, capacitors, etc. So how do I create a circuit that will give me 1.2 to 3 volts from a 14.4 source with a minimum of fuss?