Guest post by Richard Smith We've finished testing power consumption under different conditions for the XO-1 and the XO-1.5. The new machine performs well while suspended, and suspends very smoothly. Here is a chart of power draw at the wall, assuming a laptop plugged into a 230V ac outlet. This includes the power draw of the AC adapter; battery-only numbers will be significantly lower, but there is no comparison chart for that yet. (it's a bit more complicated to measure cleanly) Power draw at the wall

Scenario	XO-1	XO-1.5
Full charge	56 Wh	47 Wh
Idle	8.5W	7.2W
High	9.5W	9.7W
Suspend	5.2W	2.85W

• Full Charge: The amount of energy it takes to completely charge the battery.
• Idle: Laptop sitting at the Sugar home screen, with power management disabled, backlight on full.
• High: Laptop running the Record activity's "preview" mode.  Power management disabled, backlight on full.

You can shave close to 1W off of the idle and high numbers by turning the backlight off.  The XO-1.5 charges faster and using less power to charge the same battery.  It also draws slightly more power when in high use, thanks to its variable CPU.1