Yes, the Z-Uno alone draws 1mA so with a 3000mAh you should in theory get 3000 hours (125 days, so four months) not counting in any losses and working that it is 100% charged etc. It does seem to imply that the 1mA is to do with the DC-DC conversion ("about 70 μA if DC-DC is turned off by unsoldering R12" - https://z-uno.z-wave.me/technical/) but it's not clear then if you have to provide it directly with a 3V3 supply (I am guessing you do) so you'd likely still have to convert it somehow if you were using a 5V power bank.
A latching relay sounds like the sort of thing to look at (smaller the better for the lower opening current), I'm afraid I don't have one in my box of relays else I'd try it for you and see how I got on. It sounds possible albeit could be quite expensive if you look at one Z-Uno per LED strip.
I don't imagine you would have great success trying to modify an existing Z-Wave interface, the ICs are probably proprietary and expecting all sorts of things before they work. I doubt it is as simple as one pin is saying open/close the motor, even if it was the IC is likely to be in a format that would be incredibly difficult to deal with (whether BGA or similar pins).
A latching relay sounds like the sort of thing to look at (smaller the better for the lower opening current), I'm afraid I don't have one in my box of relays else I'd try it for you and see how I got on. It sounds possible albeit could be quite expensive if you look at one Z-Uno per LED strip.
I don't imagine you would have great success trying to modify an existing Z-Wave interface, the ICs are probably proprietary and expecting all sorts of things before they work. I doubt it is as simple as one pin is saying open/close the motor, even if it was the IC is likely to be in a format that would be incredibly difficult to deal with (whether BGA or similar pins).
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