Download here
Inspired by d13t's DiskCapacityMeter
Images were taken from Blue Flame iPhone Theme by unknown author
INSTRUCTIONS
Unzip and move BatteryMeter folder to your preferred directory
Edit the PATH variable in BM.scpt to match the path of the BatteryMeter folder
Set up a shell geeklet to do:
osascript /PATH/BM.scptWhere PATH is the path from step 2.
Then set up an image geeklet with image:
file://localhost/PATH/temp.pngWhere PATH is the path from step 2.
Set refresh rate of the geeklets to what you like