While official specs will not be released for another hour or so, I do fear that battery life will be poor.
Some manufacturers have already been given the green light to start listing accessories (which phone companies allow them to do 2-3 weeks before a phone drops). Take a look at this picture from Droid-Life:
http://www.droid-life.com/wp-content/uploads/2011/01/thunderbolt-accessories2.png
Offwire is listing that the standard battery for this phone will be 1400 mAh. To compare, the EVO (which can sometimes also have poor battery life issues for some users, especially when the 4G radio is turned on) has the larger 1500 mAh battery, and the Desire HD (the Thunderbolt's European twin) has a 1230 mAh battery and has SEVERE battery life issues. This quote comes from Engadget's review of the Desire HD:
"We took the new Android handset out to Portugal with us recently for our Nissan Leaf test drive and intentionally left the charger at home. Sadly, we can't say we were impressed by the result. Leaving the house with a fully juiced Desire HD at 11AM, we got to enjoy some very light browsing at the airport, a 30-minute round of Angry Birds while in the air, a few pictures taken en route to the hotel, and then some WiFi-based web exploration at our resting place before the battery gave up on us in the evening. Sure, it lasted "a whole day," but our use was minimal and the wireless radios were throttled by the phone being in airplane mode for half the time."
Seeing how the T-bolt's battery is more or less the same, unless there have been significant hardware improvements to improve battery life, I fear that this phone may have battery life issues as well.
I wish Verizon's LTE press event at 4pm EST would just come already and end this madness!