Lifespan of rechargeable batteries

I’m not sure about the actual lifespan of rechargeable batteries but it ruffles my feathers a bit that everything is moving towards rechargeable. I had rechargeable batteries in my trial hearing aids. As someone who streams more than average because I work from home I could only get about 12 hours out of a charge. With disposable batteries I get about 36-38 hours of wear per battery. I understand this isn’t quite relevant to the question but I think that disposable batteries are incredibly valuable to people who use Bluetooth a lot. I hope they can improve the charge-life or offer a 312 version of the new hearing aids.