June 7, 2026
Battery pack or daylight robbery?
Cloning a Sennheiser BA2015 battery pack
Fans drag absurd mic battery prices as one tinkerer builds a clone by hand
TLDR: A tinkerer showed that Sennheiser’s expensive mic battery pack is basically simple rechargeable batteries in a custom shell, then built a copy. Commenters were split between cheering the hack, mocking music gear price tags, and joking that the real scandal is how normal this kind of markup has become.
A maker took one look at Sennheiser’s ridiculously pricey BA2015 mic battery pack and basically said: absolutely not. The pack is supposed to be a special rechargeable insert for wireless microphones, but the big reveal is that the “smart” magic inside appears to be mostly just two ordinary rechargeable AA batteries plus a tiny temperature part. That discovery had commenters rolling their eyes at what many saw as yet another classic electronics cash grab: expensive custom batteries wrapped in fancy marketing.
And the comments? Pure outrage with a side of comedy. One musician groaned that this kind of thing is “very common” in music gear, comparing another pricey accessory to a glorified adapter worth pocket change. Another piled on with an even more painful flex: Shure’s rival battery is allegedly $115, which instantly turned the thread into a group therapy session for anyone who’s ever paid extra just to keep audio gear alive. The strongest opinion by far was simple: the battery pricing feels less like convenience and more like a hostage situation.
But there was also delicious nerd drama. One commenter declared the author didn’t go far enough, arguing the real chaos move would be ripping the whole thing apart and rebuilding it with modern charging. Another brought the sarcasm, joking about future batteries being some “gold-pressed latinum custom audiophile” nonsense. Even the practical crowd got in a jab: yes, cloning the pack works, but after all the fiddly assembly, one reader flatly concluded it’s probably not worth printing your own batteries. So the crowd verdict is clear: impressive hack, hilarious roast, and yet another reminder that accessory pricing can send the internet into a spiral.
Key Points
- •The article says the Sennheiser BA2015 battery pack used in many wireless microphones contains two rechargeable NiMH AA cells and a temperature-sensing component.
- •The microphones can also run on two standard AA batteries, but they will not charge those cells in the dock.
- •According to the article, the pack’s special sensing function is implemented with a low-cost NTC temperature sensor, while much of the charging management is handled by circuitry in the microphone.
- •The author estimates that matching replacement cells cost about $2.50 each, with lower-cost options around $0.95 per cell, and a suitable sensor costing between $0.02 and $0.20.
- •To reproduce the pack, the author modeled the enclosure in OpenSCAD, opened an original pack destructively, and observed details such as glued cells, friction-welded plastic, and a flat-top/button-top cell arrangement.