I was not aware those came in a rechargeable form! Though the CR2032 coin batteries last for years and years. I figure a couple dollars every 5+ years isn't bad. I've already done the work on my motherboard, but I have the one with the diode. Amigakit has this one
http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=724 that doesn't look like it has the diode. I had ordered one, but rather screwed it up when I was trying to solder it in. Guess it's a good thing too, because it probably would have tried to charge my non-rechargeable battery...
slaapliedje