My Nokia 6560 has been losing charge, so I need a new battery. The
battery installed now is marked BLD-3. Should I get an identical
replacement, or is a better replacement available now since the phone
is a few years old?

(Just out of habit I tried tha amazon.com line for BLD-3 and to my
utter amazement they are selling the same batter at two price levels,
around $10, and $20. I thought one might be used or expired stock, but
as far as I could tell both seem to be new and the same.)

Thanks.