Minimum charging voltage for Macbook Pro?

I am considering getting an M3 or M4 Macbook Pro. I’m curious if i t would be possible to use a small portable battery bank, like the ones that are typically designed for smartphones/tablets, to charge it in a pinch.

My current laptop requires a 65W charger, which means I have to carry around a rather large/heavy portable battery to charge it on the go.

I understand that those small portable chargers don’t have much juice in them, given their smaller size, but I’m just looking for a way to buy myself an extra hour or two of usage in a pinch.

I am talking about portable charges with Lithium batteries NOT the AC wall chargers

I don’t have a macbook, but all the devices I do have (steam deck, dell laptop, another dell laptop, tablets) are smart enough to charge from a power bank, even if the voltage is too low to do much but take the edge off… I’d strongly assume a macbook knows to try and charge itself offa that thing. You sure your current laptop won’t do the same?

If I enable it in BIOS it can charge down to 45W, but it won’t charge off my small battery which is 30W.

These work for sure:

couldn’t find the same exact model on the US site … in theory anything with these specs should work. This exact model is what I use for my Macbook Pro M2 …

the magsafe 3 and thunderbolt/usb type c ports are the same electrically meaning lowest should be 5v

but this all depends on power delivery handshaking usb 4/thunderbolt wants to 5v-48v

like a 5v .5a wall wart will charge a 2021 mpb 14" extremely slowly

caldigit goes 20v for high wattage cables 100w+

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