Ummm, can't do that now...both batteries are charged. This charger was a secondary purchase as I got a (working) charger (different model) when I purchased the 20D. Then I bought the grip in a package that came with a new battery...but no other charger. So before I bought this other one (off eBay) I would have to charge one battery, then charge the other...so it was twice as long a waiting period. I probably should look at Canon's 2 bay charger so I can throw both in at the same time but I hate spending money on something that I've already got...albeit only one battery charged at a time.
I believe that I did at one other time try swapping dead batteries in this charger but had the same results...I really do suspect the charger.
I wonder if I can do a voltage test on the batteries to see just how much of a charge they do have.
I think it's time to go back to my dealer with this...damn.
[some time later]
Well I went to my dealer and had them try another battery...same results. We opened up the unit and found 3 circuit board connections had been tampered with...or there was a spike that had melted the solder. Anyway I had them chuck it.
Yup sometimes you get screwed on eBay...I guess it was my turn. Oh Well.
"Beauty is more than skin deep"