One of the annoying things about electronics is that so many companies must make their own incompatible battery packs. For many products these are expensive but at some level still reasonable, the battery pack contains the protection circuitry and some guaranteed high quality Li-ion cells. This is not one of those devices. 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? This is one of the cheaper legit ones. The smaller changes ask $80-$100 for them I think this is a top contender for most expensive package of AA batteries you can get, and I have several microphones that need to have these replaced.…