adjust battery-warning-level of magic mouse How can I adjust the level at which Mac OS warns me about the battery of my magic mouse?
I always have a lack of batteries, so I would prefer if the battery warning comes up at 15 or 20%, so I could work the rest of the day with the almost empty batteries and put them in the charger before I go to sleep. 

Right now, if the warning occurs in the morning I have a problem.
I tried to steal the batteries out of my girlfriends camera or her wireless keyboard, but she does karate and defends her batteries.
Buying another set is not an option.

A way to get the battery level via applescript, shellscript, automator, whatever would be applicable too.
This thread has some scripts that can help you.

It seems that you wrap the results of this shell snippet in a nice AppleScript:

ioreg -c BNBMouseDevice | grep BatteryPercent