I believe it was barjohn that pointed this out, but if you are dropping it into your pocket, I expect that the backlight will assume it is dark and turn on? This would affect battery life...

Actually, with the timer set the light will go out even in your pocket but any accidental key press will turn it back on. So putting it in a pocket may not be a good idea. I haven't tested if a locked keyboard would keep this from happening but somehow I doubt it.

Probably would light up to show you how to unlock it!