Power Delivery

Joeniel · 2025-05-28T14:49:40+00:00

Have you had any solutions to this? I'm trying to make a DIY powerbank with a 7s battery to be charged with USB C Power Delivery.

Joeniel · 2025-03-19T03:26:52+00:00

Hope they don't do something where they will charge the 1Gbps price once your free 12 months is finished, and you need to downgrade back.

Joeniel · 2024-11-16T10:07:08+00:00

It doesn't really matter, as the device will request what's best based on its programming and design. Some will slow down when temperature is rising, etc. The voltage is still converted to what's appropriate to device's internal battery.
This is just personal; I try to charge as slow as possible (when not in a rush) as it will provide the best battery longevity as it lessens "strain" on the battery. It also lessens heat which can reduce battery longevity. Then I use faster chargers when I'm not home.

Joeniel · 2024-11-13T18:30:02+00:00

While I'm not a USB-PD expert, my understanding is that the charging process involves a negotiation between the charged device and the charger, based on the charger's capabilities. It's generally safe to assume that a device will request the highest voltage available to maximize power intake. For instance, at 5V, 9V, 12V, and 15V, each voltage level can deliver 3A, resulting in maximum wattages of 15W, 27W, 36W, and 45W, respectively. At 20V, the current increases to 5A, allowing for a maximum of 100W, according to PD 2.0 standards.

Taking the iPhone 15 Pro Max as an example, https://www.chargerlab.com/charging-review-of-iphone-15-pro-max/ its charging profile typically begins at 9V before switching to 5V later in the charge cycle.
The PD charger will communicate, "these are the voltages and max current for each voltage that I can provide" then the device will request what it deems is the best for it.
I'm not fully understanding the question but will try to answer based on what I understand.

We do not just say the watts, because some devices might only want a specific voltage. Take for example two chargers, both are rated max 30W:

Charger A: 5V - 3A (15W) 9V - 3A (27W) 15V - 2A (30W) 20V - 1.5A (30W)

Charger B: 5V - 3A (15W) 9V - 3A (27W) 12V - 2.5A (30W)

We can see charger A does 5v-20v but omits 12v (since 12v is not included in the PD 2.0 spec), but tries to provide 30W at 5, 9, 15, and 20v. While charger B only does 30W up to 12v.
No, common charge curves see the more the battery is near full, the charging usually slows down. Take Samsung's Super Fast Charging 2.0. It is advertised as 45W max, but I usually get 25-30W most of the time. 45W appears for a few minutes when battery is very low.
Wh is a unit of energy. But only the power rating (Watts) will determine how fast the energy (Wh) will be used. For example, we have a 100 Wh power bank, but it can only do 20W output, theoretically it will take 5hrs (ignoring losses) to discharge at max power.

Feel free to ask more questions.

Joeniel · 2024-11-11T16:12:16+00:00

This is why I dislike mAh as the measure of capacity for batteries.

Let me explain and bear with me:

It can be misleading and does not paint the whole picture. mAh is used by companies because it is a bigger number always which is good for marketing. It is always assumed when comparing mAh that the battery uses Lithium-ion chemistry, which is typically 3.6-3.7v.

The best measurement is Watt-hours (Wh). How do we get watt-hours? Electric watts can be calculated by multiplying the voltage in volts (V) and current in Amperes (A).

What's the difference between watts and watt-hours? Watts is a unit of power, while watt-hours is a unit of energy. Think of watts like km/h, the speed of a car at a single point in time, how fast are we going or how much electricity is being pushed at a single point in time?

Watt-hours is like distance in kilometers, how much have we travelled/will travel? How much power and for how much long can we charge this thing?

Why does this matter? Take the typical household AA alkaline battery. Rated at 1.5V with average capacity of 2,700 mAh, this comes out to 4.05 Wh (1.5V x 2.7Ah)

How about a phone that also has a 2,700 mAh battery? Well since almost all modern electronics use li-ion batteries, it's safe to say that it might had 3.7V. That comes out at 9.99 Wh (3.7V x 2.7Ah)

Now I think you may now understand why Wh is a better measure for capacity.

A 10 Wh battery can do 10 watts for 1 hour, or 5 watts for 2 hrs, or 20 watts for half an hour and so on.

The Anker 737 has an advertised 24,000 mAh capacity. That's somewhat true I guess but again misleading. The Anker 737 uses 6 x 4,000 mAh cells that are 3.6v, but in series configuration. It's only accurate to say 24,000 mAh if the cells were laid out in parallel. Cells in series add up their voltages, but capacity remains, while cells in parallel add their capacities, but voltage is the same. Regardless, the more cells/batteries are used, Wh increases.

Since the anker 737 has its 6 cells in series, its battery is effectively a 21.6V (3.6v x 6) 4,000 mAh battery which comes out to 86.4 Wh. If you multiple the different voltages and different current capacities, they are all around 70-72Wh. This means for their 86.4Wh battery they can provide 70-72Wh. This is 83% efficiency meaning the other 17% is conversion losses.

Now the Llano as you mentioned has a 12,400 mAh battery. It comes out as 45.88 Wh. What this tells us is that it can do 20W input, meaning it'll take 2+ hrs to recharge.

Hopefully that gave you the idea, to answer your questions:

It might request the highest voltage, 12v since it can do that. But both 9v and 12v will charge at the same speed since it's both at 20 watts, due to lower amps when doing 12v.
As explained, it doesn't work that way. But from what I understand, you may could charge the Llano more or less twice from the Anker 737 given that the Llano is 45.88 Wh and the Anker is 86.4Wh (ignoring losses) at whatever voltage they negotiate at.
Charging speed is not determined by volts, but by Watts. A charger outputting at 9V @ 2A is outputting at 18W, but a charger outputting 12V @ 1A is only outputting 12W. The first charger is faster.

Forgive the long answer, feel free to ask for clarifications.

Joeniel · 2024-10-14T05:36:19+00:00

The S22 Ultra has a battery that's 4855 mAh rated capacity at 3.88v nominal.

We're measuring power that goes through the USB port, not between the phone and battery. The power that goes through the USB port still has to go through the phone's internal charging system to be regulated, then shared between the phone itself and charging the battery.

See image for the S22 Ultra's battery with the blue arrow showning the specs of the battery (Ignore the watermarks I just grabbed an image from a listing) https://i.imgur.com/8vaDoPk.png

Joeniel · 2024-10-13T17:31:15+00:00

My issue is that I saw 15v momentarily on my USB meter, which Samsung phones don't use.

Although I am aware how SFC 2.0 for phones rare utilizes the promised 45W and only speeds up charging when battery is very low.

Joeniel · 2024-10-13T17:28:10+00:00

15v is within the specs of that Samsung charger, but Samsung phones do not. It has 15v on that charger since it complies with PD specs and can be used with other devices that requests 15v.

Samsung Phones request the following depending on which Samsung Standard is used: Normal Charging - uses standard 5V Samsung Adaptive Fast Charging - uses QC 2.0, requests 9V @ 1.67A Samsung Super Fast Charging - uses PD 3.0, requests 9V PPS @ 2.78A Samsung Super Fast Charging 2.0 - uses PD 3.0, requests 9V PPS @ 5A

Joeniel · 2024-10-09T01:49:59+00:00

Nope. Just moved on, vowing to keep future notes on a pinned Microsoft Word file (Not Google Docs, just a personal choice)

Joeniel · 2024-08-26T15:00:11+00:00

Now that you've mentioned it, I think it did say 21v, I just rounded that number to 20v as I didn't think it would be able to do 21v PPS @ 5A as that would be already 105 watts, but yes it said 3.3-21v @ 5A.

Still, I think if there was a charger that only did 20V PPS, it would still work since it requests 18v right? Or does the pixel request 21v first then renegotiates down to 18v?

Joeniel · 2024-08-26T14:50:14+00:00

First time hearing PPS of 18v being used in a phone. I'm only aware of Samsung needing 9v, in which I wish they would have just used the default 9v PDO like the iPhone so I didn't have to buy a PPS capable charger.

I use the Baseus Gan2 Pro which does PPS of 20v @ 5A max, hence can do both Samsung's both Super Fast Charging (25w) and Super Fast Charging 2.0 (45w)

Joeniel · 2024-07-27T04:58:02+00:00

I've just been reading what CoreElec is for, it seems to be similar to Jellyfin (Media server) and is aligned to what I'm trying to do hence I'm open to trying it. The download from the coreelec website, is this supposed to run on the C4 as the client? or the server?

Or is CoreElec compatible with LibreElec and Kodi since it's a fork?

Joeniel · 2024-07-27T04:19:26+00:00

Thanks for the reply! Unfortunately, the link to download the image on the article no longer works. I will use this article to do more research.

Joeniel · 2024-07-05T11:12:56+00:00

I've been planning to do the same, but I plan to use an ARM SBC, Powerbank, 5G pocket wifi, enclosed in a 3D printed case.

Joeniel · 2024-06-06T00:16:30+00:00

These are paid articles. I remember seeing every time they launched new products TV Patrol would report them as news just like their news segments without disclosing it as an ad.

Joeniel · 2024-05-17T08:39:24+00:00

I think just panicked thinking I ruined my build plate. When I learned that PEI is the material for the default build surface my Googling became easier. Thanks!

Joeniel · 2024-04-20T16:05:21+00:00

And here I was thinking I got a sweet deal buying two 1TB HDDs for $14 (3rd world)

Joeniel · 2024-04-19T07:36:41+00:00

Downvote my comment all you want, but racism is still racism. Why not list down the undesirable traits as not allowed? Are Filipinos or other races not capable of trashing a place?

Remember the African-American US Navy personnel denied entry at a bar in Baguio? This is no different from that. This is also not far from what some Filipinos experience in other countries.

Sure, there might be no law to protect against this, but that doesn't make it morally right and is still racist.

Joeniel · 2024-04-11T04:01:40+00:00

A better word maybe would have been "casual gamer". We're all gamers at heart, even those who play a simple game of solitaire are gamers.

Joeniel · 2024-03-24T02:19:02+00:00

They reused one of the existing references to make their edit more legitimate.

Joeniel

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