Currently Being ModeratedJan 28, 2013 2:25 PM (in response to OzziesMAC)
One less battery. All the difference.
The Apple Wireless Keyboard now requires just two AA batteries — one less than the previous model. And its intelligent power management system conserves battery life. So when you’re not using it, the keyboard automatically powers down. The instant you start typing, your keyboard turns on.
note, powers down, not goes to sleep.