The One does not use a proprietary battery! It uses the very COMMON 2032. I have many of them at home for other devices. Buy them at Amazon. When they are depleted, call Ascensia for FREE replacements. That was a rant that was unnecessary, Jason. Sorry.
Unfortunately, this is what I was told by their customer service department. I’ll own what I said, and apologize. I’m the exact opposite of you Dave. I hate the One, and love the Next Link. I’ll send it to you if you want another one. They are sending me a replacement, and I don’t know if I’ll have to send this one back. We might have to wait until I get the replacement meter. I did ask them if they could send me a Next Link instead, of course they said NO! ️