I moved your post to its own topic since it could spark quite a conversation that deserves its own focus.
For the benefit of others, for context, it originated in this thread:
The only phones that support the refund plan are now older phones. The G3 you are carrying is probably the best in terms of battery life, because it is the newest of the choices.
You may be able to have a local cell phone repair shop replace the battery, if maintaining the Refund plan is your primary concern.