"My name is Doug...and I'm a Thunderbolt-aholic..." (all reply - "Hi Doug")
With that said, I was thrilled to read this post that the Vigor battery with a higher mah will fit and work with the Thunderbolt....now....for the million dollar question...
Have you been able to see an actual increase in usage time between charges with the Vigor battery? If I can get a few established reports that it will be a very noticeable increase in usage time between charges, I'm definitely putting that battery on my list of stocking-stuffers for Christmas!