Oh, you're right. I forgot that a cigarette lighter adapter is needed. This is the one that I bought. The PowerAdd Pilot Pro battery output port connects to a DC-to-DC cable (included with battery) with a male 5.5mm barrel connector. Your linked adapter with 5.1mm barrel connector might work as well, but I don't know. It definitely won't connect to the 5.5mm DC-to-DC cable, but I seem to remember that the output port of the PowerAdd battery is smaller than 5.5mm (the included DC-to-DC cable has different size ends). So maybe you can direct connect to the smaller DC output port if it is 5.1mm. If you could find a measurement for the DC output port of the PowerAdd you could verify. I did a quick check for the specs and couldn't find it. I have no way to accurately measure mine. Wow, I left out half of the solution, haha. Yes, SAE to barrel connector and then I think I used one of many barrel connector size adapters that comes with the PowerAdd battery. Give me a couple of days and I'll get you pictures and an exact list of parts. I also "electrified" my top case on the BMW so that the PowerAdd and other devices could charge in a locked weatherproof case.