How many volts is that dratted battery anyway? I found some exit light backup batteries that might do as an external source for a BootBooster, if not an inefficient (wrong kind of duty cycle I would think) external battery pack.

I've also always wondered if the right lump-on-a-rope, with the lead fitted to a fake battery/contact block might work like the proverbial charm. If the lump portion was the attached to the same surge connector/switch as the AC adapter for simultaneous switching, might the Luggable never notice the difference?