I put an ammeter on my Nexus One and measured 160 ma in black screen, and about 450 ma in white screen (with a "flashlight" application).<p>When on but screen powered down (normal "waiting for a call" mode) I measured 2 ma, average, with occasional blips much higher (to 400 ma, measured with a Fluke 87 in MIN/MAX mode).<p>When powered "off" the phone takes 60 uA - I attribute this to keeping an internal RTC active, possibly keeping some sort of pseudo-static RAM active - but those are just guesses.<p>The battery voltage measured 4.1<p>I did these current measurements by wedging in two thin pieces of copper tape with an insulator in between, placed between the + battery terminal and the phone's + input.<p>The phone indicated "4 bars" and Edge service (not 3G) when I made these measurements.