[bradleydobedoo]

Okay, a bit of math is needed, and I don't have the brain for it. I have a power port with a usb adapter plugged in it so I can charge my cell. SO - the USB adapter, when plugged into the port, has a small green led light that glows. ( the port is wired directly to the battery. I know, I could wire it to the headlight or something, but electricity is like magical voodoo to me.)

In theory, with a freshly charged battery, how long would it take for that little green light to drain my battery? I'm wondering because, say, if I am on a road trip, and stop in to eat lunch, do I really need to unplug that usb so the power isn't drained? Seems like a tiny amount of power draw, but still. just on the safe side. thoughts?

 

[BillyD66]

That one little light should takes weeks to make any difference. Over lunch probably wouldn't even register on a multimeter.
If you are really worried you could unplug the USB adapter (from your OP it looks like only the power port itself is hardwired to the battery) but again I think it would be overkill.

You could always run a test at home in the evening to be 100% sure. Leave it plugged in for 3 hours or so and then go start it. That way you'd have your answer for sure.

 

[Voltage]

First we need to know the amperage of the LED then we need to figure out the amount of power/watts it draws on from the 12v battery. Then based on the battery size we could then figure how long the battery will last. That time could vary depending on what else is running or the condition of the batter. This is becoming very complicated process for a single LED. LOL
For a quick stop (lunch etc...) I'm sure you would be fine. Probably even for a couple of days or more. IMO though I would only plug it in when in use. Less chance of forgetting it and creating a problem.

 

[stroguy]

That green LED is at most drawing 20 - 30 mA's, that's milliamps. If your battery is capable of supplying a stated aH's which is amphours, you can do the math. I have no idea what the aH is of a motorcycle battery, but at 30mA and just a conservative rating of 10aH that LED would take 10/.03 or 333.33 hours to drain.

 

[bradleydobedoo]

thanks - if it takes 333 hours to drain, I guess I am safe to stop for a hot dog.

 

[mikoloe]

DONT SWEAT IT BRADLEY~ if you stop for lunch, Have a good one! :nod:

 

[stroguy]

Like I said the 10aH is purely guessing. I would think that battery has a bit more than 10aH, but you are mucho safe to keep that LED lit.

 

[wyntress]

DONT SWEAT IT BRADLEY~ if you stop for lunch, Have a good one! :nod:

Be sure to have a cold beer as well as the hot dog!!! Any way, you will be fine, as previously suggested, just do a 3-4 hour check.

 

[Chop Chop]

I just added a 12v plug for the same reason USB, GPS... and added a switch so when I'm not using it there is no power