I love tearing apart cars, devices, and gadgets. I love it more when they go back together properly. I’ve lost count of how many computers I’ve built and repaired.
The IR board appears to be upside down in this photo.
Instead of a heat gun or hair dryer, I used a rice sock (http://www.wikihow.com/Make-a-Rice-Sock) to apply heat evenly across the entire back of the case while the case still sat upright for me to work on getting the battery loose. It was a lot easier than trying to heat the back of the case, then flip the case over and work feverishly before it cooled.