Disclaimer - I have done ZERO research on this one I like the idea of a battery backup for the pumps to keep them going in the event of a power loss. With nasty weather approaching it's only a matter of time before the power goes out. Sometimes it's quick, sometimes it's for a day or two. I am planning at some stage to get a generator, but haven't dealt with it. So to power the vortechs off a battery what do you need? [list type=decimal] [*]Do you have to use their battery backup? Can you make your own? [/list type=decimal] Where's the logic in the system? Low voltage cutoff in the MP40 controllers that switches to the aux power input, or what? 12VDC aux input, or something else? Remember, I haven't done a lick of reading yet I want significant flow for a variety of reasons but none perhaps more important than keeping my nem happy on her perch. Walkabout = swath of death (which I accept already btw). An airstone ain't going to cut it.