Yosemite Upgrade vs Clean Install battery life

[aoaaron]

I can confirm from my experiences:

Upgrade of Yosemite from a 2014 rMBP showed 3-5 hours of battery life per 100% charge.

I then formatted and clean installed yosemite. Battery life is now 8 hours+ from a single 100% charge with improved battery life over Mavericks. If people are suffering from poor battery life on Yosemite's upgrades, give a clean install a go if you have time. It helped me

 

[Bending Pixels]

Personal recommendation only - clean install. Yes, it takes longer, but I've found that I tend to avoid any of the issues that some people who choose to do an upgrade (vs. clean install) run into.

And yeah...it's a leftover conditioning (ala Pavlov's dog) from using WinDoze for too many years.

 

[GP-SE]

I usually do a clean install, however I went from Mavericks to Yosemite doing an upgrade though Mac App Store. I haven't had any issues at all, fast boot, and still getting identical battery life as Mavericks.

 

[blooperz]

Also did an upgrade through the App Store...no issues to report...battery life is fine...