2nd Generation Doorbell Question

I have recently fitted a new 2nd Generation Doorbell and it is all working fine. Originally I fitted it with the idea of removing it when necessary to re-charge the battery but, having given it some thought I decided to hardwire it to a transformer.I fitted the transformer and made the connections to the 8v outlet. What I'm not sure about is, is the bell running via the transformer or is it still using the battery which was fully charged when I put the doorbell back on the wall. When I go into the Dashboard I can't see anything different to what was showing when I was just running it off the battery, Should there be anything different and how can I tell if the transformer is doing its job?Many thanks for any help.