No, not another thread about replacement OEM batteries
Actually I am wondering which one of my BP-511's is older.
I bought on 18 months ago as an extra for my G3, and I have the one that came new with my 300D this January.
Is there any way to tell which one is older? They both look about the same. I use the battery grip, so I'm not sure which one dies first.
The only unique markings are what appear to be serial #'s
One has QJP and the other has RJP7.
Would it be logical to say the QJP would have been first out on the production line?
Anyway, just wondered if anyone had any words of wisedom on this.

