I got new Oticon OPN miniRITEs two years ago. I also got a ConnectClilp and carry it every day. It turns out I rarely use it as a remote mic or remote control. I have not streamed a lot of music-maybe 50 hours in two years. I do appreciate it for phone calls (though I don’t spend a much time on the phone).
Anyway, the battery deteriorated to the point where it would show the red light in the evening, and if I tried streaming or a phone call in the afternoon, it would shut down.
My wife took on the challenge and ordered a battery from an eBay vendor (eElectronicParts.com, two batteries for about $14 including shipping).
eBay has a lot of batteries with the same voltage and mah rating and similar dimensions, but often the dimensions are not given.
The batteries we got turned out to be 4mm wider than the original, but my wife did make it work. There were two difficult points: First, the extra width meant cutting away some of the plastic inside the battery tray. Second, Since the battery connector is glued in, she unsoldered the wires from the old battery and soldered them on to the new. That meant soldering on a “hot” circuit, which requires extra care.
Other notes: a T5 torx screwdriver is needed. The body is best popped open at either corner on the end with the USB connector. The original battery is held in by double stick tape and must be pried out. There are some good pictures in the thread here: The Oticon Connect Clip Scam
Of course, the big questions are, will these cheap batteries last all day? And how long until they need to be replaced again? Time will tell.