Try to change these lines:
set Capacity to (do shell script "ioreg -l | grep -i -m1 IOBatteryInfo | cut -d, -f1 | cut -d= -f3")
set Current to (do shell script "ioreg -l | grep -i -m1 IOBatteryInfo | cut -d, -f4 | cut -d= -f2")

with:
set Capacity to (do shell script "ioreg -l | grep MaxCapacity | cut -d= -f 2")
set Current to (do shell script "ioreg -l | grep CurrentCapacity | cut -d= -f 2")

Because I developed the initial script on my iBook G4 and on new Intel Mac, the command is quite differente...
I have not tested the lines, I have just tested the line in terminal.

Someone could be sent me the result of the command : ioreg -l

Thanks for your help ;-)

just 3 things to do when you unzip this adium xtras :
1/ unzip and copy the Battery Icons folder to your homedir Pictures
(http://img146.imageshack.us/img146/18...lder7hp.jpg)
2/ unzip and install the Battery Icon.AdiumScripts.zip (just double click to install)
3/ add the text %_batteryicon{5} in your alias name
(http://img89.imageshack.us/img89/6255...ure27ax.jpg)

and wait 5min, you personal icon must change after 5min, to see it you can add yourself in your contact list ;-)

Just copy the BATTERY ICONS folder in your Pictures folder (in your home directory)
http://img146.imageshack.us/img146/18...lder7hp.jpg

And just %_batteryicon{5} after your Alias
http://img89.imageshack.us/img89/6255...ure27ax.jpg