Hm, my battery aids chime, then I know I’ll have like 3 or so more chimes until they’re dead, each I think is with 15 min apart. Don’t know exactly, I didn’t measure, but I do know that I really ignore them, it’s bunch of them, and then it finally dies. It definitely could be 2h with half an hour reminder, time flies. Yes, I’m mostly waiting until the battery is dead, if I’m at home doing nothing important.
So if it’s important, when I hear chime, I just pull out the new battery and leave it to breathe until second chime comes, and I then quickly swap. Even when on BT calls, swap and reconnection goes fast. But ok, I don’t have any dexterity issues and I definitely don’t fumble. I swap batteries while walking, sitting in the train or wherever, I mean, I don’t need the table in front of me.
And I don’t have a problem of changing the battery in front of anyone.
Phonak marvels and paradises, 312 and 13, T and not T, all had similar behavior. All with power one batteries. I’d expect similar behavior of all new aids. OPN 1 are as of now 2 generations old, no?
But my widex dream also beeped and I had some time until it dies (like 15-30 min?). But ok, only one beep and I wasn’t streaming with them.
I must say, after this experience with phonak M and P, I’d be really frustrated going back to some aid that would beep and die in a few minutes.
Also, I really wonder how much rechargables can last daily.
With S and M receivers, R works great for many people and they have like 30-50% of battery left after a whole day with some streaming as well. Maybe with P also? But SP/UP… not sure
My findings were that with P, and BT streaming, each hour eats 10% of the battery. For phonak aids so BT classic.
I think R resound was better and could survive 16h day with 8-10h of streaming, someone reported that? Not sure about oticon. Since it’s also BT LE, I’d expect it eats less battery.
But, with stronger receivers, especially in phonak’s case, I’d be very cautious. I just wouldn’t expect R will do the whole day, especially if person needs a bunch of BT streaming.
My 13 for P receivers and bunch of BT streaming is around a week (S receiver is around 10 days). Wearing 6-10h a day, 2-4h bt streaming.
Without streaming, 312 were 1 week for P and 2 weeks for S, but also, 4-6h wearing a day.
R was around 40-50% left with P (actually S was similar) but those days I didn’t BT stream as much as I do now with 13, TV connector yes.
UP/SP definitely uses more power.
R devices are just that - R for any receiver, they have the same mAh available, so it really is a question how many hours you can get out of it if you need stronger than P receivers.
Not to mention, depending on your environment and streaming needs.
If oticon more really can deliver 16h day with 8-10h streaming for SP/UP receivers, then I’d expect those devices to maybe even cover two days for S-P receivers, which would definitely be a move in a good direction 
When rechargeables will be able to hold 5 days, with 6h BT streaming, on P receivers, that would be a game changer.
Until then, except if you have dexterity issues (go R) or need for A LOT of BT streaming (probably go battery), choice is very subjective, based on personal preference / annoyance.
In any case, battery endurance for P+ receivers on oticon more would be very much interesting to hear about.
Especially since they’re using neural network, to see how much that thing drains battery 