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Hi Troy.
Only thing that varies with the circuit for LED lights is the resistor size. Depends which voltage you feed em. LED's typically draw around 20 milliamps of current (0.020 amps).
If using 2 rechargable AA batteries, series resistor would be 120 ohms (R = V/I, R = 2.4/.020 = 120).
For 12 volt, 600 ohms (12/.020 = 600).
Some of the white ultra brights draw a bit more, up to 40 milliamps, but a standard red one will be about 20.
You can chain up to 4 without drawing too much juice from the battery on 12v and probably 2 on the AA's. A 60 ohm resistor on the AA's and a 240 ohm on the 12v. 1/2 Watt resistors would do the job in both cases.
The draw from a 12v battery would be pretty small, only about 80 - 100 ma, for a 4 led chain.
Cheers
Bill
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