http://www.outdoorlanternsonsale.com/led-keychain/
Changing an LED from 2 to 3 prong.?
I'm trying to hook up a 3 prong Multi-Colored LED to a keychain photon run by 2 CR2016 batteries. Can this be done? How would you go about hooking this up? And it may be really stupid to ask but would it be ok to solder the led wires to the batteries?
yes, just find the correct two pins to use. But you need a resistor in series to limit the current or it will burn out. Resistor values depends on the battery voltage, the LED Vf and If.
R = (Vbat – Vf) / If
Most battery terminals are made of chrome plate, and cannot be easily soldered, plus you can damage the battery by that. And that makes it difficult to replace the battery. Get a battery clip.
edit, that battery seems to be a 3 volt unit, so 2 in series is 6 volts.
R = (6 – Vf) / If
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