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My favourite XO-1.75 feature of the week: battery usage in the sunlight. The built-in light sensor recognizes we are in the sun, switches off the backlight (you don't even notice) and now your battery lasts much longer.
Alan Aguiar's profile photoChristoph Derndorfer's profile photoHiram Jerónimo Pérez Guzmán's profile photoAndres Aguirre's profile photo
Reading an ebook in the sun, XO-1.75 should draw around 0.2 Watts, that'd give you a lot more than 9hs. On the other hand, watch movies or use a CPU-heavy activity and it'll drain the battery in a lot less than 9 hours, even in the sun.

It is actually pretty variable.
Cool 9hrs of power for work and hacks :)
Oh, I totally forgot to ask: What combination of hardware and os version do I need to test this myself? (Especially with spring apparently making a grand entrance towards the end of the week this would be a great feature to test;-)
Upcoming os30 from the 11.3.1 series is the easiest path. And Sun 1.0 :) 
Thanks for the info, can't wait to see the release of os30 (and the sun) then!
christoph -- it works in current releases. it's just a bit buggier. ;-) the sensor is beside the "storage" led (the one that looks like (o)), so you can play with this indoors with a strong flashlight as well.
Just remember: if you remove the bezel, the light sensor thinks you're in the sun... all the time. :-)
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