Hi, I’m looking for a battery too. apparently the number on it corresponds to the size 442258. 4.4mm x 22 mm x 58mm. which apparently is a special manufacture size. the maximum size that will physically fit inside the streamer 4.5mm x 22.75mm x 58.61mm. There is a 402050 battery that is a bit smaller that stock, with the same rating, or a 382250, a little smaller, but actually higher capacity 50ma stated. but both I can only seen to find in bulk from china. Bear in mind before you order something on my advice, I haven’t tried it yet.
Hi Wolf I can’t send private messages yet and I am short on time as I write this.
Go to Amazon dot com and search for the ipod nano battery. It fits. Even though it is shorter - it has twice the amp hours. Same voltage, of course. ignore the 3rd wire and solder the positive and negative wires to the streamer pig tail. The battery comes with tools for opening the case.
Next time I have to change my battery I am searching for even more amp hours. Even if I have to mod the case for a thicker battery. But that’s the way I roll.
ALSO, I am seriously thinking of installing an OFF SWITCH in the positive wire from the battery. Something Oticon jolly well should have installed in the original design. Think of it - controlling the power to an as needed basis would extend battery life greatly.