In 1.2 the icon followed the Cinnamon theme and fitted the other system tray icons, same colour. Now it stands out a different shade than the others.
Tested with Mint-X, Faenza and elementary - the applet must be calling a different icon/type of icon than it was before? Any chance of having this detail reverted back to Cinnamon 1.2 behaviour?
It's using a symbolic icon when the battery is missing and a full color one when there's power info.
I sound ungrateful, nagging and obsessed with details now but in 1.2 there was uniformity in the panel icons and now one of them sticks out, it looks unattractive :/
Elegant, coherent: http://i.imgur.com/d03Hx.png
I'll survive though :o)
Can you check with the latest commits?
Cheers! All sorted in 1.3.1