Hear is a quick update (pun intended) after using he Rechargeable OPN’s.
I had mine upgraded last week at a cost of $300.
The upgrade took less than 15 minutes.
They replaced the HA battery door.
The new door is very slightly longer than the original - maybe 1/16" (as measured).
The new door has two gold contacts on the bottom which connect to the external recharging base (included) - never have to open/close HA doors again for about a year.
My experience - although limited and with new batteries has been great.
They have never ran down when used all day - for me usually about 14-15 hours and NO streaming (Android).
The longest usage was 15-16 hours and did include 1.5-2.0 hours of streaming from TV adapter.
They seem to recharge fast - I would guess in about 3 hours.
The manual shows various battery usage times from 15-19 hrs based upon streaming, no steaming etc.
I used regular 312 batteries on the way home from the Audi until I could get a full charge on the z-power batteries - so you can use both type of batteries.
Link To Manual: https://www.oticon.com/-/media/oticon%20us/main/download%20center/opn/ifu/15555-10098%20z%20power%20consumer%20ifu.pdf
Value? Your mileage may vary. $300 is kind of steep for a little plastic door or when adding up the cost of disposables.
For me having my HA’s work every day, all day, without having to scramble for batteries while driving or in a meeting is worth it.
The little recharge stand is nice to hold the HA’s in place and out of the way when not in use and I find the charger LED’s make a nice nightlight.
I will miss having the sticky battery cover tape stuck to my finger tip and watching a 312 roll around the sink and disappear down the drain!!!