Yes, I saw that, but I tried removing the battery anyway. I have reinstalled the keyboard several times now - it's all snu and as it should be, as far as I can see at leastg. (I do have A+ certification for PCs, so don't think I am doing anything silly, though I am not so confident with laptops!).
I wanted to test with a USB keyboard but don't have one - nor does anyone I know, so that's a no go for now I'm afraid. (Not that that would tell me exactly where the error is).