No, you don't charge an external battery with the phone, that'd be silly and pointless. The whole point is that you don't have to tether the phone. Many external batteries are sold with the charger, or you get one for like $6 off ebay. The spent battery you take out of the phone, you put in the charger.
I've always laughed at the hoops I've seen people jump through in place of this silly idea that an extra battery is a huge burden- as compared to: tethering a mobile device to something for hours (gee, it's NOT mobile anymore!) carrying around an external charger that's 4x the size of an extra internal battery, HUGE honking battery cases (that also have to be tethered to charge), and the old standby: wishing for a phone with stats that don't exist. (If only it had a 7500mAh....!!!)
Of all these 'alternatives', in my experience a simple removable battery is the most logical, least hassle, and actually befits a MOBILE device.
Good to know you don't have swap batteries back into the phone to charge them.
As for the rest, you're just putting words into my mouth. While not denying that carrying around extra batteries is extra daily carry space.
Your counter arguments were not presented by myself or anyone else in this thread, and they are also moot in light of technologies like QC, USB-PD, and wireless charging (for those with a desk job). You may have your use case, and it may suit you, but your defense is laughable. Just say it suits you and leave it at that. I can't argue that it doesn't suit you. But all this other garbage you posted is ripe.
The solution that fits a mobile device is, in my opinion, larger batteries in the phones at the cost of a mm or two in thickness that can easily go a day with medium to high usage. Sound familiar? You seemed to gloss over it when I said it the first time. At no point did I state any of what you're arguing against. And what cheapo charger are you using that you're tethered for hours? QC takes your phone from near dead to nearly topped in 15 minutes. Even my Nexus 5 does great with just 30 minutes of juice. Longer than a battery swap, but not hours. And who doesn't have that kind of downtime during the day?
With that said, we do have a battery pack for travel. Why should I have to shut down my phone, swap the batteries, stow the dead one, and restart my phone when I can just plug it in and leave it alone for a while? (I find the 30 second number garbage, phones take almost that amount of time just to start up again) Granted, my wife carries the battery pack in her purse. Worst case, I don't have my phone for 30 minutes. The horror. Works for us, and it can charge both of our phones at the same time. We didn't buy a massive pack, probably a mid-sized one. It could fully (0 - 100%) charge one of our phones 4-6 times over, plenty for any kind of travel where we don't have easy access to another power source. I have a hard time imagining it taking up much more space than the equivalent amount of spare batteries and an extra charger.
At the end of the day, I gave my ideal view of a thing. Just because you don't share it doesn't mean I think you're stupid or wrong. I mean, I think less of you now after all the drivel you posted. But I wasn't saying that people who swapped batteries are idiots.
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