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Consensus on the Garmin forums seems to be that it's the screen that consumes the most power. You can turn the backlight off completely which, apparently, makes quite a big difference to battery life. Also, the map screen consumes more power than the data screens.
pjay-
Also, the map screen consumes more power than the data screens.
That's good to know, I can just leave it on data and let the navigation pop up when there's a turn.
Been doing that with the compass, explain why I get a fairly consistent battery life with the Edge Touring, should change it to data screen (which is a little more distraction having all the numbers in front of you).
edscoble
I reckon you may be right.
The eTrex 20* use both GPS and GLONASS, it last a lots longer because of the battery (2x AA), I managed nearly 2 days out of it before the battery fully depleted and that include leaving it on at low brightness all night, if I use rechargeable battery on the eTrex, it might last as long as says the 810.
*screen resolution is very similar to 810 apart from the lack of touchscreen.