This question already has an answer here:
Two days ago my new Thinkpad X1 Carbon arrived. It reportedly has "up to 8.2 hours of battery life".
I installed 13.04 Raring Ringtail (x64) on it a day after it was released, and then gnome-shell.
Now, with wireless, mobile internet and bluetooth all turned off, and screen brightness reduced, it reported 3 hours of batter life at 100%, and given how quickly it's decreasing that seems to be accurate.
Results I got from googling:
- No-one on this forum question mentioned issues with battery life...
- someone suggested that Ubuntu might not manage the fan properly (although I haven't noticed excessive noise) so I installed thinkfan including running
sensors-detectas suggested under "troubleshooting".
- some else recommended some special grub boot options, but I didn't understand them and in the comments someone suggested they might no longer be necessary
I'm going to try rebooting into Windows now to see if it performs better. If it doesn't I'll contact Lenovo support and call it a hardware issue - and of course update this question.