I guess you need some practice in reading comprehension. I stated I measured my adapter with the "Kill-A-Watt" meter. I received a reading of 0.0 watts 0.00 amps when the power supply was plugged into N800, charging complete. That is a fact. It is what was read off the instrument. If you want to debate the precision of the testing equipment; go right ahead, that is a different issue, but the readings I got off the instrument are facts.

i got to say that i no longer notice the message

Ehm, and you're incorrect. Say I have some applications running on the NIT (or have WiFi + BT on). It is using power then. Once in a while it will recharge; this does cost W. If you'd have no applications running, and offline mode, then it'd almost not matter indeed.

Maybe you should have used a megawatt meter instead of a "Kill-A-Watt" meter. What more can I say?

Do you understand that what we are talking about here are "milliwatts"? FWI- A milliwatt is .000001 kilowatts.

I heated my house last winter with fuel oil at $1.13/l. Electricity would of been much cheaper at that price. Since every bit of power produced degenerates to heat, in the end. I was actually saving money leaving my tablet charger plugged in.
I am considering buying a plasma t.v. so i can save more on my fuel bill. All joking aside I think I saved about $10 by using my nokia and only turning on my computer in the evening

Well.... I have some number if anyone is still interested.

I have two Nokia N800 with the AC-4U chargers. I measured input idle current in micro amps at 120VAC 60hz (like we have in the USA).

Test Unit #1 measured 263.96 microamps.
Test Unit #2 measured 609.14 microamps.

Actual test voltage was 122.4 volts AC.

~~~~~~~~~

I was surprised that the two adapters varied in idle current by so much but the readings fell in a range I expected to see, which was under a milliamp.

Some quick calculations revealed that if I leave the sloppier of the two adapters plugged in for an entire year where I live I would waste less than 10 cents of electricity for the whole year. It is even less than that in actuality because there are many hours in a year my charger will be charging my N800, so to be accurate you should subtract those time periods from the calculations of "idle time".

I am comfortable with the thought that leaving my sloppier Nokia charger plugged in 24/7 all year long I am wasting maybe $.06 worth of electricity over a year time span.


Test Unit #1 was even less wasteful. That power adapter drew only 283 watt/hours of electricity in an entire year at idle. That is less than $.04 of electricity if it idled all year long, and it is only idling a percentage of that time so the wasted electricity is even less than that.

Bottom line is.....leaving the Nokia N800 charger plugged in wastes virtually nothing compared to leaving an unoccupied room lit, or leaving a TV set on when nobody is watching it.

The current drawn at idle is very very small, but it is not zero.

M5

My AC-4U charger has "Energy star" label on the power cord, and in order to qualify for that it needs to draw less than 0.5W power when idle.

For reference:
http://www.energystar.gov/index.cfm?...ps_keyproducts

so maybe the message should stop talking about saving, and more about hazards?

Maybe it should say nothing whatsoever, but I'd settle on a compromise of it saying "have a nice Day".