I am trying out Starkey Genesis A24 rechargeable. I have never worn any HAs before so it is difficult to compare with disposable batteries. However, let me share my experience with other wearables as it influenced me to choose rechargeable. I have been using a rechargeable watch for several years and there has never been a problem with either the charger or the watch itself. Of course, the battery life is degrading as the time goes by. Ear buds is another example.
My Starkey HA batteries are good for two days so I have plenty of room to handle any future degradation. My hearing loss is mild so I can get away with a short interruption. My HAs also warn me in my ears when the battery life reaches 10 per cent. This is a great feature.
So far the weak link with my HAs is not the HAs but the charger which has been failing to charge one of the HAs occasionally because of the slotting issue. They have given me a new charger but there is no doubt that where either the rechargeable or charger fail, you need to have a plan B in case you have serious hearing loss. I believe that in the future they might introduce a super tiny magnetic emergency battery pack hugging the HAs (example, iPhone).
Another reason I bought the rechargeable is that they are known to be waterproof as they do not contain a slot for disposable batteries. The other day, I received heavy rain on my HAs and there was no worry. I have been told that my hearing aids are covered for battery replacements but it is not crystal clear.