I have accumulated more than 10 BP-511 batteries over the course of my commitment to Canon.
The problem is some of them are hardly able to hold a charge anymore, but I can't work out which ones do and which ones don't.
What is the best way (apart from using each battery and firing away on the 20D) of finding out which are the best few batteries to bring on holiday, and which are the ones to throw away? I don't want to destroy my shutter just to save a few bucks on brand new batteries.
Any ideas would be appreciated.