The new USB Power Delivery specifications allow for the delivery of up to 240W via a USB Type-C cable (an increase from the previous 100W max). The previous Power Delivery range has been relabeled as Standard Power Range (SPR), and the new specifications (between 100W and 240W), have been labeled as Extended Power Range (EPR).

For a more in-depth look feel free to check out our blog post on this topic here: https://plugable.com/blogs/news/what-is-240w-usb-extended-power-range-epr

We are often asked if it is okay to leave a notebook computer connected to one of our USB-C docking stations with Power Delivery for extended periods of time.  The short answer is yes, it is no different from leaving the laptop connected to the manufacturer's original USB-C power supply for the same time.  The long answer is yes for modern laptops, and maybe for older (1990s-early 2000s laptops) and involves going into the different battery technologies used in consumer electronics devices.

Another common question is if it is possible to use the docking station but to disable powering and charging the computer.  When a modern notebook computer runs on battery power it will often set the system to a reduced power state which may impact performance, or connected devices and we recommend always powering the computer when using a desktop docking station.  For all of our docking stations that provide power to the host computer this will not affect the lifespan of the computer's battery.

Modern Laptop Batteries: Lithium-Ion

Lithium-ion (li-ion) batteries are found in a wide range of consumer electronics from notebook computers and cell phones, to electric cars, power tools, and wearable electronics like wireless earbuds.  Li-ion offers fast charging, high-current discharging, fairly long service live compared to other rechargeable battery technologies and are relatively inexpensive.

The life-span of a rechargeable battery depends on many factors including age, temperature history, charging patterns, the chemical composition of the specific battery, and usage.  For example batteries stored at 100% charge will degrade faster than batteries stored at 50% charge, this is why most consumer electronics devices arrive from the manufacturer with between 25% to 75% charge.

Lithium-ion batteries are consumable components, however in most modern computers, cell phones, and tablets these are not user serviceable components.  To help maintain the battery all modern computers and most consumer electronics will include battery charge and protection circuits.  These can be fairly simple, charging up the battery at preset rates depending on the charge level to help maintain the battery life, or complex software controlled charging that monitors battery temperature, voltage and current draw to maintain the fastest charging while maintaining the battery longevity.

Modern notebook computers can be left connected to the original power cable or a docking station with charging capability for extended periods, and do not benefit from regular discharge/recharge cycles.  Our docking stations with charging capability rely on USB Type-C Power Delivery to power and charge compatible computers.  USB Type-C Power Delivery is a negotiated charging protocol between the host computer and the docking station or USB Type-C power supply, this allows the computer to draw only the power it requires, and even select the best voltage level for powering the computer.  In combination with a computer's built-in battery charging controller the computer is capable of maintaining the battery's optimal state even when left connected to a power source for an extended period of time.

Legacy Laptop Batteries: NiCad and NiMH

Older laptops, from the 1990s and some early 2000s, as well as some consumer electronics, and most rechargeable AA or AAA battery replacements use Nickel-Cadmium (NiCad) or Nickel-Metal Hydride (NiMH) batteries.  These batteries are slower to charge and discharge than li-ion batteries, and require very simple charge controllers, and in some cases can even be trickle-charged ( very low-current continuous charging ) if desired.

These batteries generally don't have smart charging controllers and to prolong the life of the battery required "training" or fully discharging and recharging the battery every so often.  Many laptop manufacturers recommended fully charging and discharging a new laptop 2-3 times to train the battery, this is not necessary with modern laptops.

Conclusion

Modern notebook batteries are managed by the computer's built-in battery charging circuit, and require little to no user intervention to maintain optimal battery health.  It does not harm the battery to leave the computer connected to an external power supply, so long as the computer is being used regularly.  If the computer is to be stored for a prolonged period then discharging the battery to between 50-75% can help to maintain the battery life.

Batteries are consumable components and degrade over time, however modern notebook computers can extend the battery life generally to meet or exceed the life of the computer's other electronic components.

The humble Universal Serial Bus, more commonly known as USB, has evolved to be much more than just a way to connect a mouse or keyboard to your computer. With the proliferation of power-hungry portable devices that charge over USB, we’ve all come to expect USB to operate as a Universal Source of Battery charging but, unfortunately, it’s just not that easy.

How Modern Charging Standards Operate

USB-C and USB Power Delivery (PD) Standard Power Range (up to 100W)

The USB-C connector and USB-PD specification up to revision 3.0 enable charging at up to 100W (typically 96W to 98W real-world maximums per IEC regulations). However, the protocol for negotiation between host and charger can be complex and hard to understand. Early USB-C PD implementations (starting in 2015) could be unreliable, and many manufacturers of devices used proprietary implementations to block universal charging solutions (docking stations, third party chargers, etc). With time and several updates to the PD spec there have been vast improvements in the consumer experience, though we do still encounter scenarios where there may be compatibility issues that are beyond our control (3rd party devices).

Generally speaking, USB-C PD is an intelligent charging standard with the ability to deliver variable voltage and amperage charging rates (equating to the final charge wattage). USB-C PD defaults to 5V and can adjust dynamically depending on the implementation of charger and device up to 9V, 12V, 15V, and 20V up to 5A. Not all USB-C ports on devices (like a hub or dock) offer PD charging, some USB-C ports may only offer standard USB 3.0 power at 900mA. Others may offer more at commonly found values of 1.5A or 3A at 5V (7.5W and 15W). Likewise, not all USB-C devices (like a laptop or tablet) will have the ability to charge over this connection, some still require a dedicated DC barrel jack charger that shipped with the device.

Without going into overly complex detail, USB-C PD can either use a set signal on two communication lines through a USB-C connector and cable (CC1 and CC2) which is determined by either a set resistance value and subsequent voltage reading, or two-way data communication can be established where the charger can tell the attached device how much power it can supply and/or the device can request how much power it needs. Once a contract has been negotiated and established, charging may then commence.

As an example, a laptop may require 65W of power to charge, this would most likely need 20V at 3.25A. When connecting this laptop to a USB-C charger (or dock, etc) a series of events as outlined above will occur. If connecting to a lower wattage charger, say 60W for this example, the laptop and charger will try to establish the fastest possible common charging rate which would be 20V 3A. In most cases this will work perfectly fine and the laptop will charge slightly slower than it would with the original 65W charger it shipped with. 

But what would happen if connecting to a higher wattage charger, like 96W or 98W? Many would expect their laptop would be damaged, however, because USB-C PD is intelligent some two-way communication will occur, and the charger should negotiate the fastest possible rate that is requested to deliver 65W. It is also important to note that chargers do not "push" power to a device, rather, devices "pull" power as needed. As long as the charger does not output a voltage higher than what the device is expecting damage won't be possible. Because USB-C defaults to 5V, a higher voltage will not be output unless that higher voltage has been requested and properly negotiated.

What about a laptop that needs more power, like 135W or higher (which is above the USB-C spec)? If the laptop supports USB-C PD through its USB-C connector despite needing more power than can technically be provided, it will try to charge as fast as the charger can offer. Due to the higher power requirements charging may be slower but still gain battery percentage, or the system will be "treading water", only able maintain a stable battery charge without gaining. In some situations like this, the system when under extreme CPU or GPU load may supplement more power by draining the battery while also drawing power from the charger. This may lead to a slow drain and would eventually run out of power until the load is reduced. In some rare situations like this, the laptop may only be able to gain battery while in sleep mode or off. 

USB Power Delivery (PD) Extended Power Range (up to 240W)

The new USB Power Delivery revision 3.1 specifications allow for the delivery of up to 240W via a USB Type-C cable (an increase from the previous 100W max). The previous Power Delivery range has been relabeled as Standard Power Range (SPR), and the new specifications (between 100W and 240W), have been labeled as Extended Power Range (EPR).

For a more in-depth look feel free to check out our blog post on this topic here: https://plugable.com/blogs/news/what-is-240w-usb-extended-power-range-epr

Thunderbolt 5 / Thunderbolt 4 / USB4 / Thunderbolt 3

Thunderbolt 5, Thunderbolt 4, USB4, and Thunderbolt 3 all share the USB-C connector specification and utilize the aforementioned power and charging abilities introduced by USB-C.

Qualcomm Quick Charge (QC) 4/4+/5

Qualcomm QC 4, 4+, and 5 are cross-compatible with both USB PD and USB-C specifications, falling back to PD in the event of a compatibility issue. Currently, Plugable does not offer any QC devices.

Additional Legacy Device Charging Information

With most modern smartphones you may have likely noticed a notification message while charging your phone indicating that your phone has entered "Optimized Battery Charging", this is how Apple refers to its smart charging messaging. With Android devices they will also show this notification message while charging although they refer to it "Adaptive Charging". Through these intelligent charging methods your phone will artificially reduce its charging speeds so that in the long run it will lengthen its overall battery life.

When setting up a new smart phone it may take a few weeks of machine learning to recognize your usage behavior and charging habits. Batteries go through wear and tear to which the more charge cycles it goes through the less healthier the overall battery becomes leading to it holding a lesser charge and other issues.

Your phone will alert you with a notification when it enters into a battery preserving charging state. At night you may notice your phone charging significantly slower along with a message saying “Battery full by 7:00 AM”. Even though it has the ability to fully charge in a much shorter time. If you set an alarm for an even earlier time your phone can adjust to finish charging at your alarm time. This is your phone prolonging the time it takes to charge to 100% in order to preserve battery health.

The reason why your phone will artificially slow its charging rate is to spend less time at 100% battery, and the less time your phone spends at 100% the more it helps with your overall battery health.

It is possible to disable Optimized/Adaptive Charging in your device's battery and charging settings although it is ideal for the majority of users to leave this setting enabled.

Plugable offers a range of high-quality chargers designed to meet diverse charging needs. This article provides an overview of common use cases for our chargers and highlights key features such as Programmable Power Supply (PPS) support and third-party safety testing to UL standards.

Key Features of Plugable Chargers

• Programmable Power Supply (PPS): Some Plugable chargers are equipped with PPS technology, which allows them to dynamically adjust their output for optimal charging speeds and efficiency, ensuring your devices charge quickly and safely.
• Safety: Safety is paramount at Plugable. In addition to rigorous internal testing, our chargers undergo third-party safety testing to meet UL standards. This certification (where applicable) ensures that our products are safe, reliable, and perform as expected.
• Compact and Portable Designs: Plugable chargers are designed with portability in mind, making them perfect for travel or as secondary chargers. Their sleek and compact form factors ensure they fit easily into bags and tight spaces without compromising on power.
• Versatility: Whether you need to charge a laptop, phone, tablet, or multiple devices simultaneously, Plugable offers a charger to meet your needs. Our chargers are compatible with a wide range of devices from various manufacturers, including Apple, Samsung, and Google.

Common Use Cases for Plugable Chargers

USBC-PS-60W: USB-C 60W Power Supply

Use Case #1: Ideal replacement power adapter for most consumer and business laptops including popular systems such as Apple MacBooks, Windows laptops (Dell XPS, HP Spectre, Lenovo ThinkPad), and Chromebooks.

Use Case #2: A worthwhile secondary charger to keep in your laptop bag/backpack.

Use Case #3: Optimal replacement USB-C power source for pairing with portable gaming consoles such as the Nintendo Switch or Steam Deck – either docked or handheld.

Features:

• 60W Power Delivery (PD) for efficient charging.
• Variable 5, 9, 12, 15, and 20V output at up to 3A (60W)
• Compact and portable design.
• Third-party lab tested and certified to meet or exceed UL/IEC 62368-1 standards.

PS-EPR-140C1: USB-C 140W GaN Power Adapter with PD 3.1 EPR

Use Case #1: Perfect for those seeking a smaller, lighter replacement or secondary charger for Apple devices requiring up to 140W. Also works as a great daily driver for consumer, business, and workstation laptops with USB-C or Thunderbolt charging.

Use Case #2: Good for quickly charging laptops, power banks, or other portable devices such as camping gear or educational tools at their maximum charging rate.

Use Case #3: Future-proof charger for upcoming laptops that can charge at rates above 100W through USB-C PD 3.1 Extended Power Range (EPR)

Features:

• 140W Power Delivery (PD) for fast charging.
• EPR and supported voltage ranges: 5V up to 3A (15W), 9V up to 3A (27W), 15V up to 3A (45W), 20V up to 5A (100W), 28V up to 5A (140W)
• Gallium Nitride (GaN) based technology for a power efficient and compact design
• Smaller and lighter (also doesn’t get as hot) design compared to the original Apple charger.
• Charge a 16” MacBook Pro from 0% to 100% in 1 hour 27 minutes.
• Third-party lab tested and certified to meet or exceed UL/IEC 62368-1 standards

PS-30C1W/PS-30C1B: USB-C 30W GaN Power Adapter

Use Case: Excellent travel or replacement charger for phones and tablets including Apple iPhones and iPads, Samsung Galaxy, Google Pixel, Lenovo Tab, and OnePlus devices

Features:

• 30W Power Delivery (PD) for fast charging.
• Available in white (PS-30C1W) and black (PS-30C1B) colors.
• Supported voltages: 5V up to 3A (15W), 9V up to 3A (27W), 12V up to 2.5A (30W), 15V up to 2A (30W), 20V up to 1.5A (30W), PPS 3.3V-11V up to 2.7A
• Gallium Nitride (GaN) based technology for a power efficient and compact design
• PPS support for a wide range of device compatibility.
• Compact design for easy portability.
• Third-party lab tested and certified to meet or exceed UL/IEC 62368-1 standards.

PS-40C2W/PS-40C2B: Dual USB-C 40W Power Adapter 

Use Case #1: Ideal for tight spaces such as behind nightstands or tables, and capable of charging various devices including a wide range of USB-C based mobile devices and even laptops such as MacBooks and Ultrabooks (may take some time depending on make and model).

Use Case #2: Compatible with mobile gaming devices like the Nintendo Switch and Steam Deck, offering a versatile charging solution for gamers. Similar gaming devices (ROG Ally, etc.) should also be compatible with the PS-40C2W/B.

Use Case #3: Use as a compact dual power source for lower-power USB-C devices such as Apple Homepod Mini speakers, Raspberry Pis, portable monitors, USB fans, and wireless charging stations.

Features:

• Dual port design with 40W total output (first device that is plugged in will take priority charging to ensure fast charging).
• Low profile for tight space applications.
• Supported voltages: 5V up to 3A (15W), 9V up to 3A (27W), 12V up to 3A (36W), 15V up to 2.67A (40W), 20V up to 2A (40W), PPS 3.3V-11V up to 3A
• Available in white (PS-40C2W) and black (PS-40C2B).
• PPS support for efficient charging of multiple devices.
• Third-party lab tested and certified to meet or exceed UL/IEC 62368-1 standards.

PS1-CA1: Wall Power Outlet Extender with USB-A and USB-C Charging Ports

Use Case #1: Perfect for those who need to charge both USB-A and USB-C devices without sacrificing a wall plug.

Use Case #2: A worthwhile addition to a garage or workspace. Powering tools like a drill or saw while charging a Bluetooth speaker or running an air compressor or work light while charging a portable battery pack.

Use Case #3: Functionality for a guest room! Power a bedside lamp or alarm clock while providing guests with a convenient USB charging option for their everyday devices, including wearables such as smartwatches or fitness tracker or audio products such as AirPods or Bluetooth headphones.

Use Case #4: Makes for a great traveling charger with 3 different charging options built-in and the grounding pin helps to secure the charger to wall outlets in hotels

Features:

• Dual port design with USB-A and USB-C compatibility.
• Maintains access to a wall plug while charging devices.
• Compact and convenient for everyday use.
• Supported configurations and voltages:
  • USB-C only 30W max:
    • 5V/3A
    • 9V/2.22A~3A
    • 12V/1.67A~2.5A
    • 15V/2A
  • USB-A Only:
    • 5V/2.4A
  • Note: When USB-C and USB-A are used at the same time, USB-C supports 20W max & USB-A supports 12W max.
• Supports PD and rapidly charges your devices at up to 30W when charging a single USB-C device
• Third-party lab tested and certified to meet or exceed UL/IEC 62368-1 standards.

Plugable Technologies is committed to providing high-quality, reliable chargers that cater to a variety of use cases. With features like PPS support, UL certification, and compact designs, our chargers are designed to meet your everyday charging needs efficiently and safely. For more information or to purchase a Plugable charger, visit our website or contact our support team.

If you have any questions or need further assistance, please feel free to reach out to our support team at support@plugable.com.

The charger supports the following USB-C Power Delivery outputs:

• 5V up to 3A (15W)
• 9V up to 3A (27W)
• 15V up to 3A (45W)
• 20V up to 5A (100W)
• 28V up to 5A (140W)*

*28V operation is only for devices capable of USB-C Power Delivery Revision 3.1 with Extended Power Range (EPR).

Note: For Apple Silicon based Macs with 140W charging it will be required to use the Apple USB-C to MagSafe cable to achieve the full 140W. (These systems cannot support past 100W when using USB-C to USB-C as their USB-C ports do not support EPR.)

For a more in-depth look into EPR feel free to check out our blog post on this topic here: https://plugable.com/blogs/news/what-is-240w-usb-extended-power-range-epr

USB-C Power Delivery (PD) is negotiated between the power-sourcing equipment (e.g., a dock or multiport hub) and the connected host device. During this negotiation, the device offering power communicates its capabilities, and the host determines whether it can accept the power. If the host does not support Power Delivery, no power will be sent to the computer over the USB-C connection. This will allow you to take advantage of other capabilities such as data transfer or video output without risking damage to the computer.

Plugable recommends and supports using only the external power adapter originally included in the box with a Plugable product to power the device.

Plugable does NOT recommend or support using any type of alternate or 3rd-party power adapters in conjunction with our products that originally included a power adapter in the box.

This is because 3rd-party power adapters may not work as expected, and in some cases can potentially cause damage to the Plugable product.

Should you require a replacement for an original Plugable provided power adapter, Plugable offers a multitude of power adapters for purchase separately → LINK

Please also note, this provision does NOT apply to Plugable products that do NOT originally include a power adapter in the box with the product.

For example, the PS-10CC → LINK does not include a power adapter in the box with the product. The intention with the PS-10CC (and other similar products like the USBC-9IN1E → LINK) is to use a USB Type-C power adapter that supports USB Power Delivery that you already have in conjunction with the product. 

This works because USB Power Delivery is an industry standard. Products that support USB Power Delivery are intended to work with a variety of different USB Type-C power adapters that support the USB Power Delivery standard. 
 

Power Delivery (PD) docking stations use their own included power adapter to directly charge your connected laptop while simultaneously powering peripherals. In contrast, Pass-Through Power Delivery hubs do not generate their own power; they require you to plug a separate charger (like your laptop's original power adapter) into the hub, which then passes the power through to your computer.

How Power Delivery (PD) Works

USB Power Delivery (PD) is a fast-charging standard that allows devices to dynamically negotiate power levels to ensure efficient charging. Docking stations with dedicated PD support come with their own AC to DC power adapter, enabling high power transfer directly to laptops, tablets, and smartphones. An example is the Plugable UD-7400PD, which provides its own power to deliver up to 140W of charge to the host while supporting five external displays.

How Pass-Through Power Delivery Works

A hub with pass-through charging relies entirely on an external USB-C power adapter (such as your laptop's original USB-C PD charger) being plugged directly into it. The hub allocates a portion of this incoming power (typically around 7.5W to 15W) to run its own functionality (like data transfer and peripheral connections) and sends the remaining power to the connected laptop. Because of this operating requirement, the total wattage reaching the laptop will be slightly reduced compared to plugging the charger directly into the computer. Examples include the Plugable USBC-9IN1E (up to 140W pass-through) and the USBC-4IN1 (up to 100W pass-through).

How to Choose the Right Option

If you need an all-in-one docking station that can directly charge your laptop without needing extra cables, look for one with dedicated Power Delivery support. If your laptop already has a high-wattage charger and you want to maintain power while expanding connectivity (often ideal for portable setups), a pass-through PD hub may be a better choice. If you have any questions or would like a recommendation for your specific setup, feel free to reach out to our support team at support@plugable.com.

Applicable To

USB-C and Thunderbolt docking stations or hubs with PD

If you routinely discharge your MacBook battery and fully recharge the battery often, macOS may set a battery charge limit to 80% to "reduce battery aging". In most cases this is a good option to have, however if you need the battery to be fully charged this setting can be disabled.

Disable the battery charge limiter

1. Select System Settings the Apple menu
2. Select Battery from the left column in System Settings
3. Select the Info button ("I" inside a circle) on the Charging line near the top of the right panel
4. Toggle off the Optimize Battery Charging option

A bit more detail

Time

Lithium-Ion batteries used in modern notebook computers are significantly more reliable and predictable than previous battery technologies, however like all batteries they both degrade over time regardless of use.

All battery technologies will begin to degrade after production, when in storage, or in active use. When storing a Lithium-Ion battery normally it is recommended to partially discharge the battery to help minimize degradation in storage.

Cycles

Battery life spans are often described in discharge/charge cycles, by limiting the top-end charge (often limiting the charge to 80%) system manufacturers seek to reduce the degradation with each charge cycle. One method is to simply over-spec the battery and set the operating system's 100% threshold to 80% of the battery's maximum capacity, this has the added benefit that over time as the battery degrades the charge controller could allocate more of the top-end charge potential to shift the reported 100% capacity maintaining the same power capacity over a longer period of time. Apple doesn't seem to use this approach, instead using the full capacity of the battery and implementing the battery charge limiter to help maintain that full capacity.

Apple macOS has a battery health report in the System Settings > Battery panel there is an info button for Battery Health which shows the Battery Condition and Maximum Capacity.

Our recommendation

We recommend sticking with the system's default battery charge settings, unless you specifically need to charge the battery to 100%.

The default setting helps to maintain the battery lifespan of the system, however could cause reduced work time while on battery. Batteries are no longer a user serviceable component of MacBook or most modern notebook computers, increasing the cost of battery replacement in both time and labor fees compared to older systems where batteries could easily be removed with one or two locking latches/levers.

If you have any questions please feel free to contact us at support@plugable.com and we'll be happy to help!