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.
And 18350s and 13400 (very common in “disposable” vapes), and a bunch of other sizes.
The issue with 18650 is honestly that it’s too big for most applications, especially when you look at what currently uses disposable batteries - remotes etc. - and their sizes.
Also, for li-ion, a cylinder isn’t an optimal shape, for a number of reasons, first being physics - the rolled up layers result in gaps that reduces the per volume capacity. The form factor also requires a very strong can, is prone to shorts, and doesn’t allow for easy addition of protective electronics.
For household purposes I think the best approach would’ve been utilising Nokia’s standardised battery formats (BL-5 family is still ubiquitous even though Nokia hasn’t made a phone that uses it in nearly 15 years), scaling them as necessary, while keeping a standardised pinout - with Li-Ion you kinda need more data than just the two poles can provide on a cylinder battery (temperature, internal resistance, etc.).