As the wired D130 isn't availble yet in the UK yet, I took a chance on the battery powered D230S1doorbell for use on a holiday home. I didn't expect to get the claimed 6 month battery life but was hoping for nearer 10 weeks than the 6 which it looks like I'm getting. I bought a spare A100 battery so I can swap them over quickly without disturbing the guests, but there are times when I wont get down frequently enough to change it before it goes flat.

As the battery is the same as the one used in cameras which support the A200 solar panels, it should support being trickle charged while powering the doorbell. It might just be possible to get a small 90 degree micro USB connector for the battery in gap at the end of the case, then have the wire exit through a weather sealed hole in the backplate to a 5V USB supply. Any idea if this would work?