> What model do you have?

I have an Advanced Bionics Naida. Battery life has consistently been around 8h for a few years. Then recently, my batteries decided they wanted to work part-time.

> Is there any way you can know about this, e.g. from the app?

As far as I know, there isn't a way to verify sound connection issues within the app. They happen too quickly, but usually the giveaway is that the part of the cable that connects to the coil feels like it's about to fall off. It's at the ends, usually, that most of the failures occur.

I had a Naida, now have a Marvel. The difference is night and day. The Marvel is hands-down the best hearing setup I have ever had (I am mid 50's, have worn aids of one type or another since I was 3 yo). Bluetooth is a game changer. The Roger On is fabulous in meetings and with computers (it appears as a USB sound device, it's far more reliable than BT for that). Battery life is fantastic, it lasts more than a day, and there's a fall back to disposable cells if required. Mobile app is a bit 'meh', but the rest is so good I can't complain!