Android phones, apps and tablets

Another battery related question.

After rooting and switching to CM7, my battery life was great, full day of medium usage, no problem.

In the last week, my battery life has taken a huge nose dive. Massive. Previously, if you look at this:

Standby is using 2 times display, it's usually the other way round. Any ideas??

Why is WiFi and Standby rinsing battery all of a sudden? WTF is it doing?

If you have root user access, install cpu tuner. Battery life has doubled for me, I set it to make the processor run super slow when the screen is off.