I used my 510 for the first time since the repair on yesterday's 300. The night before a long ride is not a good time to discover that the battery is also shagged...
It just won't hold a charge now, and in fact when I tried to charge it on Friday night, having it plugged in seemed to be actively draining the battery very rapidly, so I stopped trying before I killed it. Had to do the whole ride with it plugged into a power pack, which surprisingly worked well, until the power pack ran out of juice towards the end and I had to rely on the residual 12% charge lasting me the final 20km - only just made it (it wouldn't normally run down that quickly).
Anyway, I've now ordered a replacement battery. Fitting that will be a somewhat more complicated task than replacing the screen. I just hope the dog attack hasn't damaged anything else internally - I don't think it has, it seemed to record yesterday's ride without problems, despite the battery issues. New screen works just fine too.