Hey, sorry if this is a dumb question but I got these 2 batteries mixed up and I'm selling another n900 and I'd like to send the newest unused one with it. Which one is the most recent one? the serial number on the left starts with 49 and on the right with 46 so i was thinking the left one but they both look identical and have no date or anything. Thanks!

http://s2.kimag.es/share/7444266.jpg
http://s2.kimag.es/share/39837647.jpg