I think the likelihood of such dire situations must be considered. Implicit to such a scenario is that one has no friends or relatives who could bring your essentials to the hospital, etc. And hospital personnel will be so clueless they won’t be able to communicate with you. Maybe they have a device that does Live Transcribe, even Live Translate. You’ll be half-dead and incapacitated for days, and the main worry is, “Will I have my hearing aids?” Folks are hypothesizing situations as crucial determiners that will rarely, if ever, happen to most people, especially if they plan ahead. Likewise, the ability to cope in such situations is being seriously downplayed, such as carrying a rechargeable case, which can be worn on a belt and recharged with a USB cable (and wall adapter), which is available ~everywhere, and recharging one HA at a time while you still use the other, etc.
There’s a lot of potent emotional charge going on that’s clouding consideration of what’s likely and feasible. If you absolutely can’t get by an hour, a day, or a week without hearing aids, you shouldn’t go anywhere without carrying a backup HA pair, be it rechargeable or disposable. What if one of your regular hearing aids just breaks? You won’t be able to hear in one ear, and the world will come to an end…
Edit_Update: To go to a parallel world with vision, what if you really need glasses and can’t see anything very well without them? Shouldn’t you always buy extremely rugged “sports” frames and carry a spare pair with you in case you fall and smash your glasses and your head against a concrete sidewalk and have to be taken to the hospital and lie in bed for days? What will you do not being able to see without that spare pair of glasses you should have always been carrying? That’s kinda parallel to the extreme situations I see people hypothesizing here in which one absolutely needs disposable battery-powered HA’s to be able to cope…