Some car starters offer 200-400A.
https://enerprof.de/en/portable-energy/powerbanks/28/tensai-tb-13600-car-jump-starter/power-bank
Do you have any links to those videos please?
Lots of possibilities out there, important question.
e.g. https://www.instructables.com/id/DIY-Mini-UPS-for-Router-Modem/
I’d like to see a reliable answer.
Nitecore F1
Search for yourselves fellows, it is wise to do so.
In any case, as guiding beacon here's a simplified search link for AILI UPS laptop power bank on Google, videos category: https://www.google.com/search?q=AILI+UPS+laptop+power+bank&source=lnms&tbm=vid
For reference I'd choose this fellow which at least isn't using recycled laptop batteries:
It of course is better to spot weld or solder the batteries, battery contacts can cause some meaningful voltage drop at high loads and this device can drain up to 8 A from the batteries (4 A per cell).
I've been tempted to buy it sometime, but really have no need for it right now and anyway I'd prefer for it to be professionally reviewed (HKJ).
I sometimes send stuff to be reviewed to HKJ, but I'm tight on money. If someone is interested he/she can either send the device to Henrik, or make me a donation of at least ⅔ the cost for it to be shipped to Denmark. In this case (shipped to Denmark) this other seller has it slightly cheaper at ≈€12.22-12.33 total with tracked shipping: https://www.aliexpress.com/item/32990184912.html
If someone wants this to be done, I'll make Henrik confirm the item is on the way to his lab here: Review request for HKJ [USB Power Devices]
In order to increase the lifespan of the battery most UPSes are line interactive, so they just pass power through them without having the battery connected.
When it detects power loss it connects the battery in a few milliseconds.
You can’t use a power bank to do something like this, they have no method of disconnecting their battery.
Good point, certainly. If I were to need the stuff for such role I would find a way to limit charge voltage. Even if no way to adjust it in the circuitry, installing some in series diode(s) to limit the charge voltage is an option, but it would also require employing some high amps ideal diode to allow current from the battery to flow unimpeded the other way around. See:
