SF Bay Furs

28 Jun 2025 21:42

Also, I like the three Anker Power Banks mentioned as they are compatible with a dock.

SF Bay Furs

28 Jun 2025 21:37

ah, that's it then. that's where the basis comes from!

SF Bay Furs

28 Jun 2025 21:33

either way, it looks like you can always use 3.6V as the number for your Wh calculation, seems like the standard

SF Bay Furs

28 Jun 2025 21:24

(it shows the price in *I'm guessing* AUD which is why it seems so much more expensive here but it's the exact same as the US link with the addition of a lot more transparency of information because NZ)

SF Bay Furs

28 Jun 2025 21:23

so interestingly the NZ version of the page actually does

SF Bay Furs

28 Jun 2025 21:12

admittedly the output chart here is a bit confusing

SF Bay Furs

28 Jun 2025 21:05

Apparently this power bank is just barely allowed on flights
Anker Prime 27,650mAh Power Bank (250W)

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 21:38

I knew it was something like that but I'm not that deep into battery stuff lmao

SF Bay Furs

28 Jun 2025 21:37

no, typical AA battery is 1.5V. 3.6V is nominal for a lithium ion cell

SF Bay Furs

28 Jun 2025 21:28

🤔 isn't 3.6V what you get out of a AA battery? I think that's why 3.6V is the number that gets used across the board

SF Bay Furs

28 Jun 2025 21:23

https://www.anker.com/nz/products/a1340-250w-power-bank?variant=45193914908843

SF Bay Furs

28 Jun 2025 21:21

Can we summon the Shadow for his assistance?

SF Bay Furs

28 Jun 2025 21:08

if you want detailed information, go to the page for the power bank itself on the anker website and click the specs button under the picture rotation at the top

SF Bay Furs

28 Jun 2025 21:05

90% this is the minimum output, my guess is it operates at higher voltages if possible (which means you'll end up with *technically* lower amperage but it drains *faster*

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)