HTC Thunderbolt users have discovered a cheap, effective way to upgrade their batteries; steal one from an HTC Rezound.
Though HTC hasn’t officially stated it, it turns out the Rezound battery is a newer, higher-capacity battery that fits perfectly in the HTC Thunderbolt… without any modification. HTC does offer extended batteries for both Rezound and Thunderbolt, also which are compatible, but require a different battery door (compensating for the bulge-effect from the larger battery).
While the difference isn’t major, about a 15% change in capacity, you can simply purchase a Rezound battery, and use it in your Thunderbolt as a second, higher-capacity battery.
Adding to the saga, Verizon is currently selling the Rezound battery on-sale for $19.99 shipped from VerizonWireless.com.
The HTC Rezound, formerly the HTC Vigor, is HTC’s second LTE phone on Verizon Wireless. It aims to regain the top-tier phone status that Thunderbolt lost after sitting for too long on store shelves. The Thunderbolt also was painful to early-adopters, encountering numerous issues and delayed, even retracted updates.
The Rezound appears to be on-track to be updated to Android 4, but HTC has not officially commented on the device’s upgrade path yet.