Yeah, I should have mentioned the wire gauge issue. 14 gauge stranded wire is conservatively rated for 15 amps, and 12 gauge stranded for 20 amps. There are other factors at play, like the length of the wire run, but those numbers are a reasonable guideline (or at least they are going by the chart I have, I'm no electrical wizard).
I actually have two pigtails on my bike. One is 14 gauge, fused at 15 amps, and that one is for my air compressor. The other is whatever gauge came with my Battery Tender. I kept the 14 gauge pigtail because I knew it would handle most anything I was liable to plug into it; I don't know what the wire gauge was on the Battery Tender, so I didn't want to rely on it for anything but the battery tender.
I actually carry mini jumper cables in the event I need to do a jump start. I figured they'd be more versatile. If I had to guess, I'd say they're either 10 or 8 gauge.
"No matter where you go, there you are."