Powerbank General

I would basically use it as a 'safety backup' if I was on a long day hike or wandering about in a city on holiday.

Anker is the best brand then?

>Also the old battery is a great handle.

There I strongly agree.
It's why I also would have preferred the old design.

Xiaomi is. Most models are both better and cheaper than Anker.

Anker is the brand choice for Amazon-only buyers who can't into /csg/. That said, they aren't bad power banks.

When it comes to batteries, chargers etc, I play it safe. So I paid a little more for Anker. Peace of mind. I'm not gonna risk fire for a couple of bucks.
I'd say a 10,000 would be suitable. Anker makes a nice comfy small one. It'll afford you about 2 full recharges with the screen off. Less than that if you're continuously using it.
5,000 is probably too small because if you're using it it'll give you less than one full charge.

I found a slim 10,000 one, just one USB port though.

10Ah banks with QC Type-C out will generally only have one such port, as far as I know.

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But you can get dual USB-A with two outputs that are technically quick-charging [above the USB spec].

They just won't pull the maximum you could theoretically get for a bunch of the charging specs on both ports. I think this one is 18W total.

Still neat.

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I keep a 20,000 mAh battery in my car since my dash cam and GPS take up my car lighter port which works well in a pinch with either my phone or Bluetooth speaker

To make it explicit though: The 20Ah banks frequently DO support multiple ports with ~20W each, a few even can do more.

So if you really need to quick charge two devices at full speed (or maybe charge the bank with quick charge spec while you also charge a connected device ON the power bank with QC), you generally want two of the 10Ah or one 20Ah banks.

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