Cloning a Sennheiser BA2015 battery pack

A hobbyist explores the technical feasibility of cloning a proprietary Sennheiser BA2015 battery pack. The author argues that the high cost of the pack is unjustified given its simple internal components.
Why it matters
It highlights consumer frustration with proprietary hardware ecosystems and the trend of 'right to repair' and DIY alternatives to expensive OEM accessories.
I generally avoid messing with Li-ion battery packs, but these are both Ni-mh and expensive.
The article is a technical opinion piece focused on consumer electronics hardware rather than political or social issues.
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