taking initiative, showing a vested interest, being part of the forward looking process all indicate you are in it for keeps. It is thrilling the company reacted positively in following through with the affirmation you receive a replacement battery.
I hope and pray as well they will do the "right thing" and own up to the costs in full of causing the replacement to be implanted/the old one removed. Therein will lie the demonstration whether the company is fully behind its product and word.
Blessings on you as this process approaches realization,
Prayers surround you from all of us,