If you can't get the HTC branded battery and case this is a good alternative. You may have antenna issues depending upon the quality of the back case you get, from my experience, if you're normal battery is dead use this until you can find the HTC branded version.Read More
The battery quickly drains in my Thunderbolt (it could be the device as well) and lasts for less than a couple hours. Not worth your time or purchase.Read More
I was hoping that with the weight this added to the phone and time to charge it, it would last longer than it does. It only lasts about 2 hours longer than my regular battery. So I guess it is an extended life battery... just not as much as I had hoped for.Read More
INSTEN Compatible Extended Li-Ion Battery for HTC ThunderBolt 4G.