Connected to the LVC I used the same boost converter and cable as the original poster. Works like a charm. I'll do some run-time tests and follow up for anybody else who wants to hot-wire their cpap too. Please do follow up. A photo with your setup would be very useful. Where did you find the cable...

I saw one of these batteries pop up on sale. Remembering this post, I grabbed one. But I'm having a hard time tracking down the DC to AirMini cables. Can you share more info on exactly where you got one? I see that Mediastrom certainly did make an AirMini cable kit, but on 10+ CPAP online stores it ...