Many Thanks @mfalkvidd
Works just great as expected.
Regards

@Yveaux

Designed for Rpi2 & 3, Best UPS I have found is definitively UPS PIco HV3.0B HAT Stack with Battery 450 available under below link.

http://www.pimodulescart.com/shop/item.aspx?itemid=30

It accepts most technologies of batteries and capacities, but with supplied version is good enough to manage supply of RPI3 and HDD running domoticz at least for 1h and if not sufficient will proceed with clean shutdown and automatic restart on main supply is back.

Nice industrial design, including user configurable Leds and button, relay and temperature monitoring with FAN control.

I bought one 2 month ago, and I'm very happy with it.

I have not any incentive nor interest in this product, just to highlight was quickly delivered to me, technical manual is well documented ( not chinese like) and firmware is professionally maintained with a dedicated forum also available.

@Technovation
Many thanks, I took opportunity of the only oversized 20x2 LCD device I had, to add the Nbr_of_fail / Total_Counter statistics display, very useful for cumulative % on long run in addition to original last 100 msg.

I also wanted to share with you importance of having a proper shielding (underneath green tape is aluminium film) where only Radio OEM module is exposed.

Under PA+LNA in the worst case conditions (max power), shielding significantly increases TX RX reliability (ideally OEM module body should also be shielded)
Cheers