Here is a list of colours asscociated with the battery percentages. 
Again, I reccomend installing a battery percentage tweak, as it saves learning these colours.
(Notice the colour names. They were difficult to name, so I hope it's easy to understand them!)

Colour                        Battery Percentage (Rough approx.)
Red				  Charge up!	(+-10%)
Red-ish			  10%-15%
orange-ish			  15-20%
orange				  20%-30%
Yellow				  30%-40%
Lime				  40%-50%
Green				  50%-60%
Green/blue			  60%-70%
Teal (Is that green/blue?)	  And here's where it gets complicated... 70%-75%
Light blue			  75%-80%
blue-ish			  80%-85%
more blue-ish			  85%-90%
Even more blue-ish		  90%-95%	
V. Blue			Unplug shortly! (95%-100%)



If you can't make sense of that then I really do reccomend installing a battery percentage tweak,
Most of them are free!
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Aura: Battery help file - created by Josh

Do not steal my work!

Cheers.
	