I just received my replacement thunderbolt in the mail from amazonwireless and found to my suprise the battery with this replacement looked a bit different than the one I had with my first thunderbolt. Both batteries come in a package with the exact same part number. I was wondering which style does everyone have and which of these seems to be performing the best? They are different model numbers one ends in 08 (batt #1) and one in 09 (batt #2)