Hi
Here is a link to a supplier of a battery with the required specifications, (well nearly. It has a greater capacity at 650mAH so it will last a bit longer than a new originally rated 600mAH battery). ;-)
FYI the "numbers" information on a battery gives its' dimensions in mm with the first two numbers (sometimes three if it is a large battery) always being the depth and it has a decimal point before the second number e.g. your battery numbers are 453048 = 4.5mm depth x 30mm width x 48 mm length. Your measurements were very close!
Hopefully this is of some help
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
3