I just finished putting a LED in legends Ravage, I used 2 x 1.55v watch batteries. I turned him on and ten minutes later the batteries were flat.

So, if I used the same batteries in my 20 LED ratchet he should run for 30 seconds.

What batteries are people using for the smaller figures and what runtimes do you get?

Hakka.

 

i used a 3volt button on long haul
another on each of the fwi 2 guns for leader ironhide
jetfire"s engines are now wired to the circuit board
one in dotm voyager ironhide
and they do pretty well haven't had to change any batteries yet
2 in voyager ratchet's torso

so any 3 volt button cell should work pretty well it also helps if u stack button cells

 

i just wired up tlk deluxe hot rod tlk deluxe crosshairs and hftd human alliance jazz all with headlights

 

You should also put a resistor in series with the battery(ies) and the LED(s) to limit the current (and extend the battery life).

Start with a 100 Ohm resistor (the first three colored stripes on a 100 Ohm resistor will be Brown-Black-Brown). If the light is not bright enough, use a resistor with a lower resistance. Just remember, though, that the higher the resistance, the dimmer the light will be but the longer the battery(ies) will last. And, also keep in mind that those tiny button cell batteries don't hold much juice anyway.