MacBook Air (6,2): Big battery life problem after installing SMC2.0

Hi,

I would recommend NOT to install the SMC 2.0 upgrade!!!

I did, hoping to get an even better battery life than before. I got 12-20 hours before. Directlynafter the upgrade I got 2-3 hours, starting at 100%... :-(((((((

I'm totally shocked. Downgrading to an older SMC version doesn't work, an error message appears when I try to install SMC 1.9 saying that this upgrade doesn't work on my machine.

To solve the problem I installed also the new EFI 2.8 upgrade. Before that, the battery life had dropped to approx. 2-3 hours, after the EFI upgrade and a SMC reset there is an improvement to perhaps 6 hours but it's far from reaching the duration from before the "upgrade"...

Until the upgrade yesterday, my machine worked like a charm, battery life was perfect. Now I'm frustrated, that the upgrade destroyed this state... :-(

Any hints? Does anyone have similar problems??? Any help is appreciated!

Greetings,

Eike