Since you asked, I’m going by all information available online, which is included in the Phonak data sheet.
That data sheet says: 3 hours without hearing while it charges. I simply cannot risk that or even fathom risking that. Especially when I have zero hearing without aids. That’s why disposable battery with instant hearing is the only option for me.
Which is neither here nor there, since isn’t available in my model: the Lumity NAIDA UP line anyway. Aside from recharging for 3 hours, which is not an option, I simply cannot go without CROS. Which means Phonak is now out and is why I dropped them like a bad habit for Oticon yesterday.

You’re ignoring this member’s posts.

It may be older tech, but I’m hearing so much better with Oticon. Phonak lives up to most reviews - it sounds too mechanical. Oticon is so much more natural compared to Phonak. I haven’t heard like this in my Oticon Xceed for at least my last two Phonaks, so for at least 10 years. Music sounds like it used to. People sound like they used to. I can follow all conversation without missing a beat like I used to. I’m thrilled.
if they work, that’s all that matters! As I have said many times before, what I like, and you like, might possibly be polar opposites, hearing loss is almost like a a fingerprint, and 2 losses could be almost similar, but when you throw personal preferences in the mix, you can never get a perfect match! I wish you the very best of luck with your choice of hearing aids