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Actually, it is about the size of a watch. Looking for a diode - Osram 520 is the most promising I've seen, but it's a bit power hungry. Also probably need some kind of tiny power regulator, driver, or maybe just a resistor - whatever it takes to turn 6V from the watch batteries into whatever...

Yeah the microamps I posted in the first thread was probably just expected draw from a watch that the company listed for the battery and not the limit. If the math for current to capacity is as simple as I'm guessing (nobody has confirmed for me yet), the laser is actually drawing 16 mA from 4...

I guess 80 mAh of batteries that get used up in 5 hours means that whatever circuits are in the laser actually get 16 mA out of them collectively?

I have a laserlyte SCV3 which is 5 mW red laser - LaserLyte ? Sight SCV3 It is 3/4" long and runs on 4 of "377" type batteries, which are 6.8mm diameter watch batteries (different companies have different names for the type, including LR626, SR626, 1176SO, SR66, AG4, 376, and 377. Most don't...