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SF Bay Furs

unless they're somehow all individual and they don't operate serially but then you'd have 4 ports and they'd all have individual charging input and that would get really messy

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SF Bay Furs

(72Wh * 1000) / 20000 mAh = 3.6V

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SF Bay Furs

So when calculating, you have to take every cell

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SF Bay Furs

(again, could be wrong, but from what I know about how electrical stuff all works and just physics in general, this is how the mathematics shake out)

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SF Bay Furs

^ although I *do* believe the number of cells doesn't affect the Wh, that the Wh ends up being a static number? (I'm not an electrician I just happen to know a bit about this stuff because it's necessary understanding for my field) so it's not 72Wh*4 but rather that it can max output FROM FULL CAPACITY at 72Wh 👀

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SF Bay Furs

I understand now. you calculate for a single cell of the power bank if there are more than 1 cells.

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SF Bay Furs

so then your 20k has 4 cells interesting

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SF Bay Furs

The bottom of both of my 20,000 mAh power banks says :
"Cell Capacity: 5000 mAh 14.4Vdc/ 72Wh"

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SF Bay Furs

sometimes it just takes a second pair of eyes

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SF Bay Furs

I'm not sure if mine is the "prime" or not tho lmao so not sure if it's the same 20k that you have

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SF Bay Furs

How do you know the Wh of the power bank?

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SF Bay Furs

I have two Anker Power Banks:
- Anker Prime 12,000mAh Power Bank (130W)
- Anker Prime 20,000mAh Power Bank (200W)

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SF Bay Furs

(it literally just has this listed on the back and it figures out the voltage/amperage from whatever the draw is)

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SF Bay Furs

How to tell the voltage of a power bank? Even in the instruction manual and small details on the power bank itself, there's multiple options and hard to tell which to use to calculate Wh

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SF Bay Furs

Can I borrow a Shadow for power bank knowledge?

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SF Bay Furs

(43.2Wh * 1000) / 12000mAh = 3.6V

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SF Bay Furs

So in the 20k 200W power bank with 72Wh

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SF Bay Furs

and just, mathematically? 72Wh/4 cells = 18Wh per cell, nice roundish number!

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SF Bay Furs

that is to say: the Wh number is accounting for every cell, but the 5000maH and 14.4V are per EACH cell

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SF Bay Furs

Because that threw me off

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SF Bay Furs

I wonder how it figures out which cell to use or if it's serial and so recharging it just fills the individual cells 🤔 hmmm

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SF Bay Furs

So it's like a segmented power bank

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SF Bay Furs

(and I'm sure I could google a formula to figure out a more exact number but I'm sure it's all negligible)

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SF Bay Furs

yeah glad I could help :D

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SF Bay Furs

it's listed next to the mAh on mine as 74Wh

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SF Bay Furs

I think you'll get a bit more Wh out of a 5V@3A draw since that's the lowest power draw rate

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SF Bay Furs

and those are maximums (although likely, whatever you're using it for won't be operating significantly above those margins so even if it's a bit slow of a charge for your device it should probably work fine)

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SF Bay Furs

so they probably operate within a similar band of outputs, but for instance, my power bank, the anker 20k mAh (74 Wh), it outputs at either: 5V@3A, 9V@2A, or 12V@1.5A

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SF Bay Furs

in light of his presence, what would be the question?

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SF Bay Furs

https://www.youtube.com/watch?v=NflfnsU11CQ

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