Thanks for the support on this. It seems to be down to the internal battery now, but those seem difficult to find as well - V6HR, but will look around for something today.

I do have a 3955 as well, but same issue - need a new battery for that. I've been too busy teaching the past year or two, and haven't had a chance to use my devices, but want to get them updated for the coming season, and use them with Condor.

Cheers,
Roderick