Oticon OPN aids bought in May of 2016. I later bought the rechargeable setup, with the most expensive battery charger I’ve ever owned, when it became available, and Oticon did the repair/replacement thing so the batteries would actually charge (initially they lasted about 4 hours).
Unfortunately, they’ve never made it through a full day. The aids go in my ears at 6 a.m. and come out when I go to bed, usually somewhere between 10:30 p.m. and midnight. Reliably, the hearing aid batteries crap out between 8 and 8:30 pm., consistently between 14 and 14 1/2 hours, though sometimes a little earlier. The only way they’ll get through bedtime is to pull them out and put them on the charger some time during the day for an hour or 2. Otherwise, guaranteed, they’ll quit in the middle of whatever meeting is happening in the evening.
I’ve never had a set of batteries make it through a year, which I’ve been told is because they’re good for about 300-350 charges, and having to charge in mid-day means by 8 - 9 months they’re shot and are good for about 8 - 9 hours. I presume frequently recharging from totally dead isn’t great for 'em either, but that’s a guess.
Most recently the batteries were replaced end of January, after 9 or 10 months. I’ve found that with this set, it makes a huge difference which battery goes in which ear… One of the batteries will fail in the left ear in about 9 hours. The other one is good for the 14 so it’s a crap shoot whether the left or right will go dead first. I finally marked the one that HAD to go in the left ear so when I can’t afford to have the things quit I can put regular batteries in and get the correct rechargeable back in the correct ear when I put them back in…
So, the rechargeables sort-of work, most of the time, but for the price, its not impressive.