You have the advantage of years of HA use and I only have one year with my first HA, so I certainly do appreciate your experience and your viewpoint on HA batteries. All I have to offer in the conversation is my one year’s experience with the Phonak Audeo Marvel M90-R.
When I got my HA’s a year ago I was given the option of rechargeable or disposable. I thought about it. My laptop uses a rechargeable battery. My cell phone uses a rechargeable battery. My tablet uses a rechargeable battery. My Kindle eReader uses a rechargeable battery. So it seemed to me to be a no-brainer to pay a bit extra for a rechargeable battery for my HA too.
When I go to bed it is automatic for me to make sure all my devices are recharged overnight. So it was easy to add my HA’s to a well worn routine.
After a year’s use I’ve never run out of HA battery during any day no matter how long the day. At the end of the day my batteries are still between 40 to 60% charged. They could probably go for two days, but I would never do that.
Both Kate and I have Marvel M90-R’s and are pleased we choose rechargeable. Neither one of us believe we would want to fuss with disposable batteries. The Marvel rechargeables are advertised to have a 6 year battery life but I’m sure we will opt for the latest technology long before then.
That’s my personal experience, for what it’s worth.
As with anything, there’s always individual preference, and of course YMMV (Your Mileage May Vary).