Martijn Braam generally avoids messing with Li-ion battery packs, but Sennheiser BA2015 battery packs are both Ni-mh and expensive. A significant portions of all wireless microphones by Sennheiser use the same BA2015 battery pack. These devices can also take two regular AA batteries but when using those it won’t charge them in the dock. So how much would you pay for a bit of plastic around two standard Ni-mh AA batteries? They run 68 euros and u…
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