Service bulletins are recommended too, but they are not mandatory either.
The FAA does not have a leg to stand on when they tell you that they are required. End of story.
Unless that battery was installed under an STC, is continued airworthiness required, and only if that was inserted in the major alteration form 337 on the back page.
If it is not specifically in FAR 43, Appendix D, the FAA can kiss my hiney, when it comes to the scope and detail of an annual inspection.
And George, your spelling has not improved with your absence. Please learn how to spell continued there is a difference between there and their.
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