Power banks

Are power banks with 18650 cells inside safer or more 'stable' than ones with flat smartphone-type batteries? Less likely to catch fire?

Like these Anker chunky ones that obviously house 18650s. Seems like Xiaomi has ones like these too. But pretty much every other brand only has thin, flat banks with obviously thin, flat smartphone style batteries. Are 18650s safer and more stable because they're like a standardized thing, like AAs? I know nothing about almost technology desu, I just want to buy the safest power bank possible for my niece.

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blog.ravpower.com/2017/06/lithium-ion-vs-lithium-polymer-batteries/
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The other ones being ones like these. I guess Xiaomi and Anker also have ones in this flat 'slim' style.

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first, they are a standard thing, so you get great companies who ready make the batteries, it costs more to specially make cell phone style ones unless you want cellphone capacities

durability, these ones hands down are better, you still have the issues of the things melting down like you do with cellphone ones, but you damage one to the point it melts down generally requires you to throw a fully charged battery at a brick wall at full force several times while a cellphone one could be damaged by putting to much weight on it due to the flexibility.

Personally I would trust the battery ones more then I would trust the flat ones, mix in the fact that if they put 1 battery in the thing, then its already thick, so what does it matter to put more in.

that thick one you have in the pic, at bare minimum that thing is 15000 mah, up to 30000 mah depending on the battery. I don't think any battery over 5000 is legitimate, and even 5000 is pushing it, at least last time I looked into them

'flat type' batteries as you describe are li-po and 18650 are lithium-ion
check out the differences, but other than size and weight there is really no benefit to li-po, which is why most of these battery packs use 18650s because they're cheap, store better, and yes less likely to blow up if you hit it with a hammer.

this
blog.ravpower.com/2017/06/lithium-ion-vs-lithium-polymer-batteries/
this

Lithium polymer has a shorter life and stores less power.
18650 are lithium ion and thus store more power, are heavier, bigger in size, but also store power better and have a much better lifespan

lithium ion is lower power density, lower amp delivery. but more stable, can stay charged or in a drained state for far longer without cell degradation.
li-po is much higher power density (so higher capacity) and can safely discharge without bursting or fire at a much higher current (if you get appropriate cells).
li-ion has about 20-30a max discharge, where with li-po you can have cells rated into hundreds of amps for a low capacity cell. a bigger array/bank of multiple in series and parallel is how they overcome that amp limit for electric vehicles with li-ion or li-fe cells as a power source.
tl;dr li-ion is more for safety and some longevity benefit as it degrades less from staying fully charged (same with li-fe)
li-po is great for power output vs weight, but is strict about storage and charging/discharging.
li-ion and li-fe are still lithium based and can still burst into flames, they're just more stable and forgiving than li-po. most phone batteries are li-ion just flat cells
also li-ion is technically lithium polymer-ion
vs li-po being lithium polymer.

look at remote control vehicles, lower power ground stuff might be ok with li-ion. but usually will get a performance and runtime benefit using li-po, aircraft use li-po too because the higher power density

rav power is wrong in saying lithium batteries have a memory effect. as the cells are cycled or stored improperly they pretty much undergo chemical changes like corrosion. causing the cell to no longer perform as if it was new. nickel batteries had a memory effect, and multiple charge/discharge cycles could restore full capacity. lithium batteries will have the internal resistance go up over the course of it's life as it's able to hold and discharge less of it's design capacity. either lithium battery with physical damage or improper charging/discharging can fail or internally short causing catastrophic failure. li-ion just won't fail catastrophically as often in correct usage

vape kiddies are usually pushing the batteries to the edge of designed power output for a quality cell, and beyond it with cheap cell causing the accidents of blown up ones. i've seen guys that use lipo instead of li-ion cells because it can handle the power output they're asking for.
lipo would be better in most cases for high speed charging of like laptops through usb-c for stuff over 100w
under that li-ion should be fine

I use chinkpad batteries to vape
fight me

>lipo instead of li-ion cells because it can handle the power output they're asking for.

lipo and li-ion are pretty much the same thing in reality. the chemistry is functionally the same. the main difference there's been in lithium cells in the past decade or more has been lifepo.