hi, im thinking of making my own battery. the idea is to use at about 2 or more VEEKTOMX Mini Power Bank: https://www.amazon.com/VEEKTOMX-10000mAh-Charging-Ultra-Compact-Etc-White/dp/B0BD6TXHSQ?ref_=ast_sto_dp&th=1
and make a 3d print case for it. the real problen is that i want to use only one usb port on my Framework Laptop 13, 11 gen. i cant find a labtop dock that has 2, 60 w pass through. and any ideas for better battery bank can also help. thats all and thanks!
Thank, I didn’t realize that it didn’t have enough watts. And I makeing my own case that will hold the docks and more. But the downside is that is too small to use the framework battery. I need at max battery 20.5 cm long, 8 cm wide and 3 cm thick. If I find one big battery that also fixes the dock.
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12v support was never removed from PD. Mandatory support for 12v was removed after PD 1.0, but optional support is still present.
Afaik 12v PD is fully supported on Framework laptops. 15v PD was removed through a software update on 11th gen due to a chip that Framework was using entering a bugged state if the charger voltage was too close to the battery voltage (15.4v nominal).
Nitpick: The Framework Laptop 13 only supports PD 2.0, so PD 3 is irrelevant. PD 3.0 is for PPS (which allows for chargers to support a range of voltages rather than a fixed list) and PD 3.1 is for above 100w.
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They look too small to be 10000mAh in any even half honest way to me.
The fact that they’re quoting mAh for a device that hopefully outputs different voltages is highly suspect for a start. The only thing to quote that has any definite meaning in this case is some proper unit of energy, like Wh. Anyway, the Chinese pretty consistently quote ridiculously large mAh figures even for things like bare Li-ion cells where the figure has a definite, well-defined meaning. A torch I bought fairly recently came with a 18650 cell in it marked 8800mAh. It’s as light as a feather, so light that it must basically be some tiny cell inside an empty 18650 size shell and I doubt it’s really even as much as 800mAh. I replaced it with a more honest, well known Japanese brand 3400mAh cell.
I find a better battery form ugreen: https://www.amazon.com/UGREEN-25000mAh-Portable-Charging-Compatible/dp/B0BJQ7F16T?ref_=ast_sto_dp
It looks like it fix all my problems. Thank you all
It still doesn’t actually say at what voltage it provides 25000mAh so you have no idea if it’s totally uselsss or really good.
3.6 V.
Initially all USB battery banks used a 3.6 V battery internally so battery banks just listed the mAh.
Over time USB battery banks started using other voltages internally (7.2v and 10.8v are common), however manufacturers wanted to continue using mAh.
So when a company advertises a battery bank as “25000 mAh” what they actually mean is “equal capacity to a 25000 mAh 3.6v battery”.
It is a horrible misuse of units (they should just be using mWh or Wh), but it is unfortunately a common practice in the industry.
All battery I was looking use mah to show size. I think kyle is right and it’s used for marketing. I doubt that I’m getting scammed since ugreen is a good brand.
No. Current in mA or A could be called the rate of discharge. The current from the mAh rating is the rate of discharge that can be provided FOR one hour after which the cell will be fully discharged.
You could say “the battery will be discharged IN one hour” but the way you said it is just not correct English.
mW is a rate of energy transfer (aka power or rate of discharge).
mA is is mW divided by the battery’s voltage.
mWh is a quantity of energy. 1 mWh means that it can deliver 1 mW of power for 1 hour, or 0.5 mW of power for 2 hours, or 2 mW for 0.5 hours, etc (assuming no internal inefficiencies, in reality when operating at higher output power internal inefficiencies increase slightly).
mAh is mWh divided by the battery’s voltage, although USB battery bank manufacturers misuse it as mWh divided by 3.6.
mAh is not the discharge rate.
While I have seen it occasionally misused like that (and the first Google search result does say that), the C-rate is actually the inverse of that.
C-rate is the ratio of the load on the battery (in mW or mA) divided by the capacity of the battery (in mWh or mAh).
For example if I had a 10000 mAh 3.6v (36 Wh capacity) battery and I run a 25000 mA 3.6v load (90 W load) then it is operating at a C-rate of 2.5 (25000Ă·10000, 90Ă·36) and will be discharged in 24 minutes (60Ă·2.5).
Lead acid battery are often used for very short but high discharge loads such as starting an engine, so those are rated for C-rates of 20 or even higher. C20 is how much power a battery can sustain in 1/20 hours (ie. 3 minutes) before being discharged.
Battery capacity is usually rated based on the internal inefficiencies that occurs at C1 (higher C-rates = more internal inefficiencies), which is why C1 is often mentioned on the capacity ratings.
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“in 1 hour” is not the same as “for 1 hour”.
I am English too.
Compare “I’ll be there in 1 hour” with “I’ll be there for 1 hour”. Very different.
You seem to know all this but just explained it before in what seemed to me to be a slightly weird/sloppy way earlier.
But TBH, it is difficult to explain perfectly.
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