The only good reason for a disposable battery is if the power draw is somehow that a rechargeable would have expired from calendar aging by the time the disposa

The only good reason for a disposable battery is if the power draw is somehow that a rechargeable would have expired from calendar aging by the time the disposable is dead. Very high efficiency RTCs, emergency backups never expected to be used, highly specialized devices used for only a few minutes a year, etc. I do really think that we need a better rechargeable battery standard though. If something is big enough for it, 18650s are close to perfect, but not much is. There's enough devices like GoPros which have swappable batteries and third-party availability, and so are de facto standards, why don't people just design their stuff to use one of those?