Wandering through the jungle of fast charging protocols: Why „powerful“ is not always „fast“.

Once upon a time there were two wires and the most difficult part of charging was not to confuse plus with minus. Charging batteries today has nothing to do with that – along with plus and minus, there is a continuous conversation between the device being charged and the charging device. And this conversation, on top of everything, takes place in different languages, the so-called protocols.

And even before we get to this conversation, the hardware must be fully compatible: we use different chargers, cables, adapters from one standard to another… And even if we match everything, it may turn out that the charger provides the necessary protocol, but does not provide the full range of voltage and current for the most efficient charging. There are electronics in the cables themselves, some even have their own firmware that can be updated.

The wandering through the jungle of protocols for fast charging begins.

Cables are not what they used to be.

Of course, most users don’t care about this. For them, there are „branded“ chargers and cables, and „counterfeits“. They are willing to pay many times more for original chargers, thereby compensating for their ignorance. If you are one of these people, this article is not for you.

In fact, there are almost no counterfeits on the market

Hardware usually has a description, and it is true. The fact that someone does not understand what is written in the description does not make the hardware a „counterfeit“. A large part of users do not read what is written about the devices at all – be it cables, chargers or adapters. Yes, some manufacturers use marketing tricks to sell their products, but this does not make them guilty, nor their products – counterfeit.

Never forget that when you point your finger at someone, three other fingers are pointing at you! If you think the same way, I recommend that you continue reading and I hope that this reading will be useful to you, as I plan to try to explain everything simply, so that even I can understand it!

Let’s start with the cable

Plus and minus are no longer enough. You need at least two more, and for Type-C four more wires – D+, D- and CC1, CC2 (and let’s not forget one more – a common ground for everyone).

• D+ (Data Plus) and D- (Data Minus): These are the data signal lines in the old, classic USB standard (USB 2.0).
• CC1 (Configuration Channel 1) and CC2 (Configuration Channel 2): These are the configuration channels that are specific and critical only for the USB Type-C connector.

A detailed explanation of each of them:

A) The D+ and D- (Data Lines) pair

These lines were created to transfer data (for example, from a flash drive to a computer). However, in the pre-USB-C era, engineers found a way to use them for fast charging.

• How they work to charge: When you connect your old phone to a charger, they „negotiate“ for power using the voltage on these two lines. For example, if the charger outputs 3.3V on D+ and 0.6V on D-, the phone “knows” that it is a QC3.0 charger and can request 9V or 12V.
• Protocols that use D+ / D-:
  • BC1.2 (CDP): The oldest charging standard.
  • APPLE: Apple uses specific resistors on D+ and D- to indicate whether the charger is 5W, 10W or 12W.
  • Qualcomm Quick Charge (QC) 2.0 and 3.0: Rely entirely on the voltage levels on D+ and D-.
  • Samsung AFC: Same as QC2.0.
  • Huawei FCP: Uses a digital signal on the date lines.
  • OPPO/OnePlus/Realme (old versions VOOC / DASH / WARP): Uses a proprietary protocol on D+ and D-, which requires an original cable.

B) The CC1 and CC2 pair (Configuration Channels) 

This is the innovation in USB Type-C. These pins are the reason why USB-C is so smart and can be plugged in from both sides (reversible).

• How they work:
  • Orientation detection: When you plug in a USB-C cable, the charger measures which of the two CC pins is connected. This way it understands which side is “up” and which is “down” so it knows where to supply power.
  • Role detection: They allow the device to know whether it is plugged into a charger (Host) or another device (Peripheral).
  • USB Power Delivery (PD): This is where all the magic happens. The PD protocol doesn’t use the old data lines (D+/D-). Instead, it sends a digital code on the active CC pin (the other one is left for powering „active“ cables). Through this code, the charger and the phone talk to negotiate high voltage and high current (e.g. 20V @ 5A for laptops).
• Protocols that use CC lines:
  • USB Power Delivery (PD) 2.0 / 3.0 / 3.1: Fully digital signals on the CC line.
  • PPS (Programmable Power Supply): As part of PD.
  • Qualcomm Quick Charge 4.0 / 5.0: Since these standards are compatible with PD, they also use the CC line.
  • Chinese fast protocols (Huawei SuperCharge, OPPO VOOC) in modern USB-C versions: Some of them also use CC to recognize the original cable or for compatibility with PD.

The difference between BC1.2 DCP and CDP 

The BC1.2 (Battery Charging 1.2) protocol can be either DCP or CDP. Here’s what it means. There is a significant difference between DCP and CDP, but the commonality is that both allow charging with a higher current than the standard USB 2.0 (which is only 500mA).

DCP (Dedicated Charging Port) 

A port that is designed solely for power. It does not have digital logic to transfer photos or files.

• How it works: To tell the phone that it is a powerful charger, it simply „shorts“ the two data lines (D+ and D-) inside the port itself. When the phone „senses“ that D+ and D- are connected together, it knows that this is a DCP and can safely draw up to 1.5A of current at 5V.
• When it works: When you use devices that plug directly into a wall outlet or car cigarette lighter (old adapters, old and not so old power banks).

CDP (Charging Downstream Port) 

A much „smarter“ port. It allows your device (e.g. phone) to simultaneously charge quickly and be recognized by your computer as a data device (for file transfers, ADB debugging, etc.).

• How it works: The CDP contains specialized electronics. When you connect your phone, this port uses a complex series of signals on the data lines (D+/D-) to tell your phone, “I’m a USB data port, but I also have a powerful power supply. You can draw up to 1.5A while we talk.”
• When it works: When you’re testing the USB ports on a modern computer or an expensive docking station.

When the cable is smart: the E-Marker chip

I mentioned that some cables have a chip embedded in them. This is most often a microscopic chip embedded in one or both connectors of a USB Type-C to Type-C cable, and is called an E-Marker (Electronic Marker).

The E-marker can be likened to an “electronic ID” for the cable.

• What it is for: In the standard USB PD (Power Delivery) protocol without E-Marker, the charger is not allowed to deliver more than 3A of current (i.e. a maximum of 60W at 20V), so as not to overheat and ignite a thin or cheap cable.
• How it works: However, when the charger and the phone „talk“, they „ask“ the cable: „What are you?“.
  1. If the cable has an E-Marker, it responds digitally on the CC line: „I am a certified cable, I can withstand 5A of current and support USB 3.2 data.“
  2. Then the charger safely activates profiles from 60W to 100W (and even 240W in PD 3.1).

What about VOOC/SuperVOOC cables?

Some cables do not need E-Marker (for example, those from OPPO/OnePlus/Realme, which work on SuperVOOC protocols). They have their own proprietary chips. Their approach is different – in them the voltage is low (5V or 10.5V), but the current is significant (up to 6A-12A) to achieve the desired charging power.

• Different standard: E-Marker is an open standard of USB-IF. SuperVOOC is privately owned by OPPO. If the charger uses the PD protocol to „knock on the door“, the OPPO chip will not respond. That’s why the FNIRSI tester will write to you: „No E-Marker Found“.
• Hidden Hardware/Software: In older USB-A to USB-C cables for VOOC, recognition is often done in a purely hardware way – an additional, proprietary pin inside the USB-A connector that the phone detects. In modern OPPO USB-C to USB-C cables there is a chip, but it uses proprietary cryptographic keys to identify itself to the phone as „original“.

The original OPPO cable has a chip, but the PD protocol cannot read the information inside it because it is locked.

The difference in approaches (20V/5A vs. 10V/10A) 

• PD (Power Delivery): It uses high voltage (e.g. 20V) to transfer power. The chip (E-Marker) is needed to confirm that the cable can withstand high current (5A) so that it does not catch fire.
• SuperVOOC: It uses low voltage (5V or 10V) to transfer power, but with extremely high current (up to 6A-12A depending on the version). Here, the chip is not for voltage safety, but for authentication. OPPO wants to make sure that you are using their specific cable, which has thicker copper wires to transfer this high current without loss.

Most mass PD cables (without E-Marker), even if they are of good quality, cannot transfer 10-12A current at 5V-10V. The OPPO phone „knows“ this, „talks“ to the chip in the original cable and only then activates SuperVOOC. If the chip does not respond, the phone limits charging to the basic 5V/2A.

Systematizing the Jungle: A Table of Fast Charging Protocols

Here is my attempt to systematize the jungle in a table:

Conclusion

Please be lenient if there is a mistake somewhere – the jungle is a jungle for me too, although I am already quite successfully navigating. I will be happy to receive any constructive comments and additions – the comments are at your disposal!

Sources and useful information about the article

1. USB Implementers Forum (USB-IF):

   • Official technical specifications for USB Power Delivery (PD) 3.1, USB Type-C® Cable and Connector and Battery Charging (BC1.2) standards.

   • URL: https://www.usb.org/documents

2. Qualcomm Technologies, Inc.:

   • Technical information and overview of Quick Charge (QC) technology generations: QC 2.0, 3.0, 4, 4+ and QC 5.

   • URL: https://www.qualcomm.com/products/features/quick-charge

3. OPPO Global:

   • Official information about the patented VOOC and SuperVOOC fast charging technologies also used by the OnePlus brands and Realme.

   • URL: https://www.oppo.com/en/newsroom/press/oppo-supervooc-flash-charge/

4. Samsung Electronics:

   • Adaptive Support Information Fast Charging (AFC) in older models and the implementation of universal PD/PPS standards in new devices.

   • URL: https://www.samsung.com/global/galaxy/what-is-fast-charging/

5. Huawei Consumer BG:

   • Details of Huawei FastCharge Protocol (FCP) and SuperCharge Protocol (SCP) technologies.

   • URL: https://consumer.huawei.com/en/support/content/en-us00693997/

6. MediaTek Inc.:

   • Technical overview of the MediaTek Pump Express (PE) standard.

   • URL: https://www.mediatek.com/features/pump-express

7. FNIRSI Technology Co., Ltd.:

   • User manuals and specifications of the FNB58 and FNB-C2 USB testers used for diagnostics of the described protocols.

   • URL: https://www.fnirsi.com/download

Материалът Wandering through the jungle of fast charging protocols: Why „powerful“ isn’t always „fast“ е публикуван за пръв път на Галя и Тони - Галанто.

Fast Charging: How It Works and Why It’s Important for Our Devices

In today’s fast-paced world, time is precious, especially when it comes to our favorite gadgets. Imagine rushing to go out and your phone’s battery is almost empty. At such times, fast charging technology becomes a real lifesaver. But how exactly does it work and why is it so important for our laptops, phones, and other devices?

Why is fast charging so important?

We rely more and more on our electronic devices, from laptops for work to smartphones for communication and entertainment. The more we use them, the faster our batteries drain. Fast charging allows us to reduce the time we spend waiting for an outlet and get back to our tasks faster. ¹

How does the magic work?

Standard charging is often slow because it uses low voltage and current. Fast charging, on the other hand, increases either the voltage or the current, or both, to deliver more power to the battery in a shorter amount of time. ² Different technologies use different approaches, but the end goal is the same – faster charging.

The main players in fast charging

There are different fast charging technologies developed by different companies. Here are some of the most common:

• USB Power Delivery (PD): A universal standard that works with many devices, from laptops to phones, using a USB-C port. It intelligently negotiates the best charging power between the charger and the device. ²
• Qualcomm Quick Charge (QC): A popular technology used primarily in Android phones with Qualcomm Snapdragon processors. It comes in different versions with increasing charging speeds. ¹
• VOOC/Warp Charge/Dart Charge/SuperVOOC: Proprietary technologies from Oppo, OnePlus, and Realme, known for their extremely fast charging speeds at low device temperatures. ¹
• SuperCharge (SCP/FCP): A technology from Huawei that also offers fast charging on their devices. ¹
• Adaptive Fast Charging/Super Fast Charging/Adaptive Fast Charging: Samsung technologies that adapt to the needs of the device and the charger. ¹
• Xiaomi HyperCharge: One of the fastest technologies, offering an impressive power of up to 200W. ¹

Algorithms for the layman

Think of charging your phone like filling a tank with water. Standard charging is like running water from a tap – it fills slowly but surely. Fast charging is like turning on the tap more or even using a wider hose to fill the tank faster.

Fast charging algorithms are like a „conversation“ between the charger and your phone. They agree on how much „water“ (electricity) to flow and how „strongly“ (at what voltage) it should flow in order to charge the battery as quickly as possible, but also safely.

Here’s a very simplified look at how some of the main standards (protocols) work:

1. USB Power Delivery (USB PD)

Think of USB PD as a universal language that many devices (phones, tablets, laptops) and chargers speak.

• The „conversation“: When you connect your phone to a USB PD charger, they first „talk“ to each other. The charger asks: „How fast can you charge and what voltage and current do you need right now?“ The phone answers based on the state of its battery (how full it is, what is the temperature).
• „Adjusting the tap“: Based on this conversation, the charger „adjusts the tap“ – adjusting the voltage (the strength with which electricity flows) and current (the amount of electricity that flows). USB PD can offer different combinations of voltage and current to best suit the needs of the device at that particular moment. At the beginning, when the battery is more empty, a higher „power“ and more „water“ can be used to fill it quickly. As the charge approaches full, the „tap“ is gradually reduced.
• Safety: Throughout the process, the phone continues to „monitor“ the battery temperature and charge level. If the battery starts to heat up too much or reaches a certain percentage of charge (for example, 80%), the phone „tells“ the charger to reduce the „power“ and „water“ to avoid overheating and preserve the battery’s long-term health.

2. Qualcomm Quick Charge (QC)

Qualcomm Quick Charge is one of the most popular standards, especially on phones with Qualcomm processors (many Android phones).

• „The Conversation“: Similar to USB PD, the QC charger and the phone „talk“ to each other. The charger offers different voltage and current levels that it supports. The phone chooses the most appropriate level for the current state of its battery.
• „Tuning the tap“: Early versions of QC used fixed voltage levels (e.g. 5V, 9V, 12V). Newer versions, such as Quick Charge 3.0 and later, introduced what is called INOV (Intelligent Negotiation for Optimum Voltage). This means that the phone can ask the charger for much more precise voltage steps (such as increasing or decreasing by very small amounts) to optimize the charging speed and reduce energy loss in the form of heat. Think of it as very fine-tuning the tap, not just opening it two or three stops.
• Safety: Again, the phone and charger constantly monitor the temperature and condition of the battery to regulate the flow of electricity and prevent problems.

3. Samsung Adaptive Fast Charging (AFC)

This standard is primarily used by Samsung. It is based on older versions of Qualcomm Quick Charge.

• „The Conversation“: The phone and charger communicate to agree on the appropriate voltage and current. Typically, the charger offers a standard voltage (5V) and a higher voltage (such as 9V), and the phone chooses which is best for its needs.
• „Tap Tuning“: AFC switches between certain, preset voltage and current levels. It is not as flexible as newer standards that allow for finer tuning.
• Safety: There are built-in protection mechanisms to monitor temperature and prevent overcharging.

4. Proprietary standards (such as Huawei SuperCharge, OPPO VOOC/SuperVOOC, Xiaomi Mi Charge Turbo/HyperCharge)

Some phone manufacturers have their own fast charging standards, which often achieve extremely high speeds.

• „The Conversation“ and „Tank Tuning“: These standards often take a different approach. Instead of significantly increasing the voltage, they can maintain a lower voltage but dramatically increase the current. Think of it as using a very wide hose (high current) with normal pressure (normal voltage). To achieve this, they often require special cables with more conductors and thicker wires to handle the high current safely. The „smart“ part itself that controls charging may be located in both the charger and the phone, or even split between the two. With some of the fastest standards, the phone’s battery may be split into two parts that are charged simultaneously, allowing for a higher total power.
• Safety: These standards have very strict and often complex safety systems that monitor the temperature in many places (in the charger, cable, phone, and battery) and regulate the process in real time. Because they operate at higher powers, safety is critical and therefore often require the use of original chargers and cables.

In summary about the algorithms:

Each fast charging standard has its own „algorithm“ or set of rules for the „conversation“ between the charger and the phone. The purpose of this conversation is to determine the most efficient and safest way to deliver electricity to the battery at a given time. The differences between the standards are mainly in:

• What voltage and current levels they can use.
• How finely they can regulate these levels.
• Where the main „smart“ part that controls the process is located (in the charger, in the phone, or in both).
• What additional technologies they use (e.g., special cables, separate batteries).

Despite the differences, all fast charging standards have built-in safety mechanisms that protect the battery from overheating and damage by gradually reducing the charging speed when the battery is almost full or the temperature rises.

Here is a table that presents the maximum voltage and current, respectively power, for different USB ports and generations of charging and fast charging standards:

Cables matter too!

It is important to know that not every cable is suitable for every fast charging technology. Cables also have specifications that determine how much power they can carry. Higher charging speeds often require higher quality and specialized cables that can support higher current. For example, technologies such as Warp Charge and SuperVOOC often require the use of original cables from the respective manufacturers to achieve maximum charging speed. ²⁶

Fast Charging and Battery Health

You may be worried that fast charging could damage your device’s battery. Modern fast charging technologies are designed with battery safety and longevity in mind. They use advanced algorithms to manage the charging process and monitor temperature to prevent overheating and damage. ¹

The future is fast charging, and it’s coming sooner than we expect

Fast charging technologies continue to evolve, aiming for even faster speeds and greater efficiency. Universal standards like USB PD are becoming more popular, making it easier to charge multiple devices with the same charger. ¹

In conclusion, fast charging is an essential part of modern electronic life. Understanding the different technologies and requirements will help you charge your devices faster and more efficiently, while preserving the health of their batteries.

For the more curious

Here’s a full study as a PDF file (in Bulgarian) and plenty of links where they can read up on what interests them specifically.

Fast Charging – Technologies and Cables (in Bulgarian)

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64. 45W Samsung Fast Charging Type C Charger Samsung Fast Charger with USB C Cable Compatible for Galaxy Tab S9 S10 A9 S25 S24 S23 S22 S21 S20 Plus,Ultra,FE,Z Fold,Z Flip,Note20/10,A16 A15 A25 A55 A56 C55 – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/Samsung-Galaxy-Note20-Charging-Charger/dp/B0CW9PYXGZ
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66. Top 5 Best Galaxy Tab S10 Ultra Fast Chargers! – YouTube, осъществен достъп на май 3, 2025, https://www.youtube.com/watch?v=r02RRrpim88
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84. Xiaomi Hyper Charge Explained 200W IS INSANE! – YouTube, осъществен достъп на май 3, 2025, https://www.youtube.com/watch?v=Lr7xKSyPGSw
85. Xiaomi 6A 120W HyperCharge Cable Usb To Type-C – Metazon, осъществен достъп на май 3, 2025, https://metazon.in/product/xiaomi-6a-120w-hypercharge-cable-usb-to-type-c/
86. Original Hypercharge Charger Cable for Xiaomi 12 Pro+ 12 Pro 120 Watt Compatible | eBay, осъществен достъп на май 3, 2025, https://www.ebay.com/itm/146448323662
87. 6A for Xiaomi Cable 120W Hypercharge Turbo Type C Fast Charging Cable Charger for Xiaomi 15 14 13 12 12t 12s Pro Lite Redmi Note K80 K70 K60 K50 11 11s Plus Poco X5 F5 F4 Gt Black Shark 3ft/6ft Cord – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/6A-Xiaomi-Charger-Hypercharge-Charging/dp/B0C6PXZXGY
88. 120w For Xiaomi L Shaped Turbo Charge Cable Usb Type C 6a Hyper Charge Cabo Usb Tipo C L Bend Mi 11 Redmi K40 K50 Poco X4 F3 F4 – AliExpress, осъществен достъп на май 3, 2025, https://www.aliexpress.com/item/1005004519501390.html
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94. 3A for Oneplus Charging Cable USB Type C Fast Charger Cord for One Plus 13 13R 12 12R 11 10 Pro 9 10T Open Pad 9R 10R 8T 8 7T 7 6 6T Nord N20 SE N10 N300 CE 4 N100 N200 3ft/6ft – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/Oneplus-Charging-Charge-SuperVooc-Charger/dp/B0BLW9ZR43
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98. OPPO USB Type-C SuperVOOC Charger Adapter Cable 8A 5V / 10V 80W USB-C Fast Charging Cord – ZEMEL Warehouse, осъществен достъп на май 3, 2025, https://zemel.com.au/oppo-usb-type-c-supervooc-charger-adapter-cable-8a-cord/
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100. Original Super vooc 80W [11V/7.3A] for OnePlus11 11pro 10pro, Warp Charger 65w for 9Pro 9R 9 8T with 6.6ft USB A-to-C Warp Charging Cable – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/KUNNV-Charger-OnePlus-Replacement-Charging/dp/B09D9VC3NL
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114. What is the max charging wattage for the Macbook Pro with M4 Pro, using the Thunderbolt 5 port USB-C port? – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/macbook/comments/1goo5s4/what_is_the_max_charging_wattage_for_the_macbook/
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133. OPPO Showcases Find X5 Series and 240W SUPERVOOC Flash Charge at MWC 2022 While Presenting Strong Global Performance, осъществен достъп на май 3, 2025, https://www.oppo.com/en/newsroom/press/oppo-mwc-2022-240w-supervooc-cpe/
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135. Oppo Cable 65w Original Supervooc Charger Cabel Type C Reno 7 5g 5 Pro 6 Lite 4 3 Find X5 Pro X X2 X3 Neo Vooc Kabel Data Oppo – AliExpress, осъществен достъп на май 3, 2025, https://www.aliexpress.com/i/1005004421104856.html
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144. Galaxy Tab S7+ Charger Comparison: 45W vs 25W vs 15W – YouTube, осъществен достъп на май 3, 2025, https://www.youtube.com/watch?v=HPBu3VlEeW8
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176. Does USB-IF certification matter for a basic charging cable? : r/UsbCHardware – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/UsbCHardware/comments/1b3oxyg/does_usbif_certification_matter_for_a_basic/
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196. 65W USB-C Fast Charger Fit for HP Elitebook 830 835 840 845 850 855 860 865 645 650 655 640 630 X360 1040 G8 G9 G10 G11 Probook 430 435 440 445 450 455 635 G7 G8 G9 G10 G11 Laptop Power Adapter Cord – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/Charger-Elitebook-Probook-Laptop-Adapter/dp/B0743B6MLL
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212. 120w Asus laptop with 100w charger – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/ASUS/comments/1fo6tuu/120w_asus_laptop_with_100w_charger/
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218. Tablets with Fast Charging – AO.com, осъществен достъп на май 3, 2025, https://ao.com/l/tablets-14364/1-20/250-252/
219. Chargers For Tablets – Anker UK, осъществен достъп на май 3, 2025, https://www.anker.com/uk/collections/for-tablets
220. I switched from an iPad to a OnePlus Pad because of fast charging – Android Authority, осъществен достъп на май 3, 2025, https://www.androidauthority.com/oneplus-pad-fast-charging-3322601/
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222. Samsung Tab S7 fast charging? : r/GalaxyTab – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/GalaxyTab/comments/jbghjw/samsung_tab_s7_fast_charging/
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225. Does the Nintendo Switch implement the USB C spec correctly? : r/UsbCHardware – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/UsbCHardware/comments/1fd1pzd/does_the_nintendo_switch_implement_the_usb_c_spec/
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230. USB C Charger for Steam Deck/OLED & PS Portal & ROG Ally, 65W 45W 3 Port Fast PD Foldable Power Adapter for Stream Deck with 6.6FT Type-C Cable, Travel Charger for Switch/Xbox/PS5/Tablet/Laptop/Phone – Amazon.com, осъществен достъп на май 3, 2025, https://www.amazon.com/Charger-Foldable-Adapter-Compatible-Nintendo/dp/B0BFPRJF5L
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233. About Steam Deck chargers : r/SteamDeck – Reddit, осъществен достъп на май 3, 2025, https://www.reddit.com/r/SteamDeck/comments/z74fo7/about_steam_deck_chargers/
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235. Facts 101: Are All USB-C Cables the Same for Charging? – Anker, осъществен достъп на май 3, 2025, https://www.anker.com/blogs/cables/are-all-usb-c-cables-the-same-for-charging
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Материалът Fast charging: how it works and why it’s important е публикуван за пръв път на Галя и Тони - Галанто.