I have had something similar from CTEK, it was a pigtail that indicated green, yellow and red. Obviously when the RED led blinked, it was time to charge the battery. These pigtails cost between $7 - $13
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Excellent advice Miles. I routed mine through the vent on the side panel so it doesn't rub against the body.
Attachment 1134
Rated at ~12~ amps. Long enough leads to make it to the battery.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
I wouldn't use it with a lighter, but it should be good for compressors, etc.