Hey thought I would comment on this information about first batch, next batch and so forth. The first Thunderbolt was decent except power button was sticking after a while, in my home the cell signal was boucing all over the place, second day of having the phone first 2 calls went straight to voicemail instead,not letting me hear the phone ring! Battery was subpar after charging and then doing the bump charge method, got better after power saver adjustments.
Went back to the store and told my friend the asst. mngr. @ local corporate store the issue I was having with the power button sticking, he took it to the back tried clean the button up and said no go. Swapped it out for another new phone, set the phone backup and was good to go. Also told him that I called Verizon tech 2x about signal issues and got suggested on getting another battery @ my cost+ discount to help out. Called verizon Customer Care to explain the situation very nice of course about having to buy an extra battery and watching both of them under constant signal strain draining both batteries, and got the cold push off. Now bear mind I have been with Verizon for 2 years, just re-uped my contract for a new one. Never have called them constantly on a bad matter except for 3x when a serious mistake was made. Always trying to speak with them postively on how good service has been more and they treated me. Now I just got done being treated like this for asking for $20 credit difference in cost on the second battery.
Oh yeah second Thunderbolt alot better so far no issues, no bouncing signal, no draining the crap on the battery severely!