Nomenclator
thank you for your very informative reply, definitely an in depth technical answer, and I appreciate you took the time to review my posting.
It could have, very well, being just a coincidence that the tiny Fit battery drained at the same time I installed those ALLA LED's? (maybe???)
thanks God I saved the original fog lights bulbs, and installed them back, and my Honda Dealer replaced the battery without a fuzz.
I think for now I am going to stick to Halogens, until I get the time to research what works well with my Fit (I love the 40 mpg I get , especially when commuting to and from work).
I have a light bar project to do on my Ridgeline 2012 later.

 

CookieFit2001, exactly what happened after you installed the H8 LED fog lamps in place of the H8 halogens? How long did it take for the battery to drain completely? Was it hours, days, weeks? And, as examples, perhaps you drove around for an hour or with the fog lights in place, either on or off, shut off the car, and then come out a little while later and find you were unable to start it? Or perhaps you installed the LED lamps, made sure they were off, shut off the car for the night, and find you were unable to start the car the next morning?

I don't see how you could have done anything wrong, electrically, when replacing the bulbs. Electrically, both the halogens and the LED replacements attach only one way to the wire connector that comes from the car. With that wire detached from the bulb, the contact points in the connector are surrounded by a plastic insulator, so unless you intentionally figured out some way to short out the 2 terminals to each other, or figure out some way to connect the positive terminal to ground, and done so while the switch to the fog lights was in the on position, it is quite unlikely that you created a short circuit. And if you did create a short circuit, you would know it. You would see and hear a big spark. It might be hot enough to melt the connector's plastic insulator or nearby wire insulation.

Now, it is possible that there was an internal short in the LED unit, a defect of that nature. However unless the fog lamp switch was in the on position, that wouldn't matter, If there was a short, when you turned on the fog lamp switch, the lamp with the short would either not light up at all (the current would be routed "around" it) or it would light up much less bright than expected, and much less bright than the other lamp without the short. Did the lamps seem to be working? If so, it is unlikely there was a short. If there was a short, it would not be likely to cause a problem overnight, with the switch to the fog lamps in the off postion. It would be more likely to create a problem while you were driving, with the fog lamp switch in the on position (and the fog lamps on, perhaps in the fog).