Most devices & gadgets are rechargeable nowadays. The only thing I have that still requires batteries is a headlamp but even those are available in rechargeable varieties. House smoke detectors need a battery too.
Most devices & gadgets are rechargeable nowadays. The only thing I have that still requires batteries is a headlamp but even those are available in rechargeable varieties. House smoke detectors need a battery too.
Always the possibility we invent a way to make them smaller, more compact, or higher voltage
None of those things improve the insertable battery. Their size and voltage are what makes them useful. A smaller, higher voltage AA battery is an entirely useless AA battery.