EEngr
Certification of an A/C is not the way to verify items like a battery of this type.
Just a curiosity:
I disassembled several laptop and cell phone lithium battery packs. They have a quite complex protection scheme with some temperature and ea. cell voltage monitoring. It seems mandatory a much more complex system when using lithium batteries in aviation. The recharger/load limiter should be designed "integrated" (in design) with the pack. This is critical to the battery reliability.
I remember my surprise when first found "complex circuitry with microprocessors, etc." inside a video camera we was using in skydiving. This was in 1998.
And i remember when in University read a russian book on batteries. They seemed far more complex than what i was studying like Theory of Circuits in Millman Taub books like. Batteries of today are fantastic but
she are dangerous and complex. And can present surprises. (Like the women.
)
Some points i covered in an earlier post.