Android phones, apps and tablets

Eh? Screens use way more power than the CPU.

You are right, but screens are more or less the same across all of the latest devices. That leaves you with CPU, WIFI, 3G (in that order). I was just trying to point out that Android is a CPU hungry OS and this contributes a huge amount to your power usage.

Blackberry CPUs are low because they don't do anything.

That's because they were not designed to do anything apart from email. Which they do great.

Did you consider that the tablet battery life is better because the battery is much larger than the size of the one in your phone and the phone is out and about trying constantly to maintain a connection to cell towers whereas your tablet is probably in your lap for 10min whilst youporn serves up the freshest of fresh?

You are right, did not think of that. My Nexus S has 3300mah and the tablet is 6000.Oh, and tablets are not practical for youporn activities.

Android and the underlying linux kernel have power management facilities in place. Andy might be right in saying it's not the most optimised (it wasn't designed and built ground up for mobile) but to say "Android is not designed with CPU/power usage efficiency in mind" is bollocks.

I meant to say not as much as the other 'pure' mobile OSes. Android was built on top of Linux kernel and includes a lot of shit to make it easy to develop for.