SF Bay Furs

28 Jun 2025 21:02

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

SF Bay Furs

28 Jun 2025 21:00

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

SF Bay Furs

28 Jun 2025 20:58

So when calculating, you have to take every cell

SF Bay Furs

28 Jun 2025 20:52

(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)

SF Bay Furs

28 Jun 2025 20:50

^ 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 👀

SF Bay Furs

28 Jun 2025 20:45

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

SF Bay Furs

28 Jun 2025 20:44

so then your 20k has 4 cells interesting

SF Bay Furs

28 Jun 2025 20:43

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

SF Bay Furs

28 Jun 2025 20:39

sometimes it just takes a second pair of eyes

SF Bay Furs

28 Jun 2025 20:39

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

SF Bay Furs

28 Jun 2025 20:38

How do you know the Wh of the power bank?

SF Bay Furs

28 Jun 2025 20:37

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

SF Bay Furs

28 Jun 2025 20:36

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

SF Bay Furs

28 Jun 2025 20:30

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

SF Bay Furs

28 Jun 2025 20:24

Can I borrow a Shadow for power bank knowledge?

SF Bay Furs

28 Jun 2025 21:00

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

SF Bay Furs

28 Jun 2025 20:58

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

SF Bay Furs

28 Jun 2025 20:56

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

SF Bay Furs

28 Jun 2025 20:51

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

SF Bay Furs

28 Jun 2025 20:46

Because that threw me off

SF Bay Furs

28 Jun 2025 20:44

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

SF Bay Furs

28 Jun 2025 20:44

So it's like a segmented power bank

SF Bay Furs

28 Jun 2025 20:41

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

SF Bay Furs

28 Jun 2025 20:39

yeah glad I could help :D

SF Bay Furs

28 Jun 2025 20:38

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

SF Bay Furs

28 Jun 2025 20:38

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

SF Bay Furs

28 Jun 2025 20:36

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)

SF Bay Furs

28 Jun 2025 20:35

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

SF Bay Furs

28 Jun 2025 20:29

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

SF Bay Furs

28 Jun 2025 20:08

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