[vineyardmike]

> I'd much rather be able to swap a charged battery for the drained one in my phone especially in circumstances when I'm in a foreign country and dependent on my phone

I don’t deny that this is a valid use case for you, but I’ve absolutely never been in this position.

I carry around a battery phone charger in situations where I’d depend on my phone. If you squint, yes that’s pretty similar, but the big difference is that a USB charger can power my iPhone and my partners android phone without requiring the phones to use standardized batteries internally.

I think batteries should be replacing in a repair sense, but I’m not sure the “pop open the back and swap it on the streets of Tokyo” is a common use case we should legislate against.

Like others said, I would much rather have it be more durable (eg waterproof). Also I’ll add that thinness is a desirable trait (to a point).

[smn1234]

Carrying around bulky power banks or worse, chargers to then tie you to sit close to an outlet and wait for the battery to charge, is not entirely ideal when you're on the go, foreign or domestic. It's also less anxiety-inducing to not have to worry about where will I get my next charge and how long will it interrupt my plans for.

[vineyardmike]

The portable battery pack is no more bulky than carrying around portable phone batteries?

And it has the benefit of being sharable.

And it has the benefit of being able to work hot - you don’t have to turn off your phone to charge it.

[JohnFen]

> The portable battery pack is no more bulky than carrying around portable phone batteries

They're a lot bulkier. Phone batteries are physically very small and light. Good power banks aren't.

[jenadine]

Power banks come in different sizes. The bigger ones also allow to recharge your phone several times. There are also small and light ones that contains energy for one full charge or less.

[lagadu]

I agree with your point completely but that use case is an edge case, would it be worth it regulating all phone design in order to address such a specific scenario?

Such use cases are normally handled by creating specialty products.

[vel0city]

I've got a little 2_000mAh 3.7V (7.4Wh) USB battery pack here that was vendor swag from a conference, a probably 3.7v? 10_000mAh () that I'll then assume is ~37Wh. and a Canon NB-13L 3.6V 1250mAh (4.5Wh battery pack) for my camera.

For mm^3/Wh, the results are:

Small vendor swag power bank: 96 x 21 x 26

52_416 / 7.4

7,083 <-- worst one

Canon battery: 42 x 30 x 9

11_340 / 4.5

2,520 <-- wow that's way less

10,000mAh dual USB power bank: 139 x 22 x 60

183_480 / 37_000

~5 <-- wow

By volume / energy, the big power bank wins by a mile. And tbh its not that huge, similar footprint to my phone and about twice as thick. Plus, it can power two devices at once, which can be pretty handy. It has a bit over twice as much power as my phone's battery. This logically makes some sense, as phones these days are pretty much a battery and a screen with a small logic board tagging along for the ride.

If I'm on the go, I'd much rather have a large battery bank that provides a good bit of flexibility rather than a battery that only works with a single device. This one battery pack can charge my phone, my camera, my wireless mouse, my keyboard, my headphones, my e-reader, and then all the same list of stuff for my spouse. If I got a fancier one, it could even provide extra juice to my laptop. If I only had a battery specifically made for my phone, I'd only be able to swap out my phone battery and all of the rest of my devices would need their own batteries or just be left dead.

On top of that, if I wanted to then charge that battery outside of the phone I'd have to lug some specific charger for that model of battery. Meanwhile if I bothered getting a newer USB-C power pack the same power cable that charges my laptop and my phone and my headphones can also recharge my spare battery along with all the rest of the devices I mentioned. I'm much happier having a 10,000mAh battery pack in my backpack to recharge when needed than needing to think about having a few different batteries around and their related chargers to keep track of. Once this one dies I'll probably

[vel0city]

I'm dumb. Should have been 37, not 37,000. So actually 4,953 mm3/Wh, meaning the battery pack is definitely the winner.

[stickfigure]

When battery life is a concern, I carry around a small flashlight and a (very) short USB cable. The flashlight can both receive charge (from the wall) and send charge (to the phone) through its USB port.

Lots of high-end flashlights do this. Mine isn't much larger than the 21700 cell it contains. If you want to go smaller you can get a 1850-based flashlight and still almost double the capacity of your phone.

Plus, it's a flashlight.

[JohnFen]

But it doesn't really address the use case well. It won't fully charge the phone and it takes time to do the charging.

[stickfigure]

I don't understand. Why won't it fully charge the phone? And you can use the phone while it's plugged in. In all respects it gives you ~2X the number of useful hours at the cost of having to carry around a very small item.