I’ve done that on older battery packs. It’s a PITA because many packs are sealed, not screwed together, and you have to physically cut them apart to get to the batteries within for replacement. And assemble the batteries, which are often soldered in order. Then you gotta figure out how to reassemble the whole thing in a way that it won’t crack apart again. Doable, but definitely not for everyone.
I’ve done that on older battery packs. It’s a PITA because many packs are sealed, not screwed together, and you have to physically cut them apart to get to the batteries within for replacement. And assemble the batteries, which are often soldered in order. Then you gotta figure out how to reassemble the whole thing in a way that it won’t crack apart again. Doable, but definitely not for everyone.