Ring Doorbel 3 (battery) not responding at all

I bought a ring 3 doorbell in March 2023, I have used it ever since while it was using battery power.  Lately it has completely stopped working. I have checked both my battery packs (have a spare one that I used to switch out for a fully charged one when needed) and no success. The light around the button to 'ring' the bell does not light up and when I try to press and hold the reset button it also does absolutely nothing.  Is this a known fault? I've only had the doorbell for about 1.75 year which doesn't sound to long to me...