Just like the Smart Keyboard and the Apple Pencil, tearing down the Smart Battery case is an irreversible destructible process. Prying open the soft microfibre finish in the inside revealed the aluminium sheet on which the microfibre cloth sticks to. The sheet has been heavily scratched to improve the adhesive bond. There is also a mesh interfacing to make sure that there are no fatigue damage on the silicone hinge.
Removing the aluminium sheet gives one access to the 1877mAh battery and its logic board. The battery has been strongly glued in its place to improve the rigidity of the case. The logic board connected to the battery is very small and only contains a few ICs related to charging and load switching.
In the end, the iFixit team gave the Smart Battery case for the iPhone 6s a repairability score of 2 out of 10. It notes that while replacing the battery is possible, it will likely destroy the inner microfibre lining.
[Via iFixit]
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