but it just did
Consider I pulled numbers from Richtek paper.
Right. Bring Nokia 5110 back. In last century when it was popular, it was nice a slim portable phone.
And still their results were lower than your 80% estimation.
I think swappable batteries are really practical.
My estimation of total efficiency was 70%.
No, they are not. The more you forget that there are battery inside your device - the more practical it is.
BTW phones with removable batteries are still in production.
Once the battery is in, it becomes like any other phone and you can forget about it. Conversely, when it dies, and you bring a spare, you can INSTANTLY have full charge again. Then you can use your phone normally while you charge the other battery. You can even keep one in the car or backpack. Just like cameras.
So because of one phone, the problem is "likely"?
It's not a problem for cameras.
Well I've not run into the problem, or anybody I know. So it must not be that bad. Certainly, it's not bad enough for manufacturers to stop using removable batteries in cameras... or power tools... or radios, GPS units... etc. etc. My camera draws around 7.5W at peak. I think you are overstating the problem.
Why bother with spare batteries for a phone when these are widely available
you can INSTANTLY have full charge again. Then you can use your phone normally
....Then you can use your phone normally while you charge the other battery. You can even keep one in the car or backpack. Just like cameras.
But then you have to carry around a clunky thing with cables anyway, a charger for your now flat battery...
Chargers are slow, and usually when you're plugging in, it's because you needed the juice 5 minutes ago.
Bulky, heavy power banks when I'm trying to travel light? No thanks.
The removable/replaceable battery ship has long sailed. It's not coming back.
but it just didIf you have a new Galaxy, yes.
I can see the utility in charging your headphones or whatever, but I don't think phone-to-phone charging is going to catch on.
Chargers are slow, and usually when you're plugging in, it's because you needed the juice 5 minutes ago.I doubt that someone with such level of discipline would have fully charged spare battery in the pocket
[edit] There are QC 2.0 / USB-C PD power banks around that are quick - obviously if phone supports QC or USB-C PD.
2) Are random people you don't know really going to want to sit with you for at least 10's of minutes with your phones back to back so they can charge? For what?
a) If you so desperately needed that charge to call someone or something, you could just use their phone for that
Well I've not run into the problem, or anybody I know. So it must not be that bad. Certainly, it's not bad enough for manufacturers to stop using removable batteries in cameras... or power tools... or radios, GPS units... etc. etc. My camera draws around 7.5W at peak. I think you are overstating the problem.
I carry a QC 3 battery bank and it's stupidly quick to put useful charge back into my phone, it's 5-10 minutes is enough to be very useful.
Only problem is there doesn't seem to be a QC3 battery bank under 10000mAh anywhere, so it's not as small as I'd like.