I'm not sure your link supports your assertion. The negative reports seem 3-6 years old and perhaps based on 3rd party software vs the software they came with.
A more recent set of figures shows that implementation can have an impact, but that if you've got control of the software you'll probably do better with Vorbis. Note the test is on matching bitrates, but Vorbis is more efficient per bit.
It also shows that FLAC has longer battery runtimes which I'm guessing is because flash based players no longer need to spin up disks more for the larger filesizes.
A more recent set of figures shows that implementation can have an impact, but that if you've got control of the software you'll probably do better with Vorbis. Note the test is on matching bitrates, but Vorbis is more efficient per bit.
http://tuomas.kulve.fi/blog/2009/11/07/n900-battery-duration...
It also shows that FLAC has longer battery runtimes which I'm guessing is because flash based players no longer need to spin up disks more for the larger filesizes.