My ring pro chime wont come off steady green led

My ring doorbell went from hardwired to battery power for some weird reason, charged it up but then the chime pro 2nd gen would not come out of solid green.I have pressed the button in for 5 seconds, 15 seconds, 1 minute but all that happens is the led goes off and then comes back on and then goes solid green with a flash after 1 minute for a split second and then goes back to solid green.Tried different power sockets and the same result. Anyone got any suggestions, was bought in Oct 2020