You are both right and wrong-ONE nero 5 will work with the icecap battery backup,but to use two nero 5 pumps you have to hook them up to the icecap using a Y cable and only one of the nero 5 power adapters-one pump will work but the other pump will function idiosyncratically using their app and not at all using their controller in manual mode.Horrible poster?? Uh yeah, sounds like user error to me^^^^^^^. Want to put money on it? If I had a dollar for every bit of inaccurate online fish store advice.... For the other members who are curious, when I get home from my trip I will post video and connections proving it. It worked during the last power outage two weeks ago flawlessly with my Nero . I did not test with other pumps, only Nero. I tell you helping people is getting to be a pain in the butt when immature inexperienced reefers post crap.