How to charge a Chromebook without a charger: socket first, then watts

First, look at the socket

Everything else on this page depends on one detail: where the charger goes into the Chromebook. Plugable’s knowledge base on USB charging puts it plainly: not all USB-C devices can charge over that connection, and some still need the dedicated DC barrel jack charger they shipped with. HP draws the same line from the charger’s side: its advice that a higher-watt charger is safe applies to USB-C chargers with Power Delivery, and it says this is not always the case with older barrel-pin chargers, which operate differently. A round barrel socket means a replacement of the same kind, not any of the routes below.

If the charger plugs into a USB-C port, the port still has to take power. ASUS asks you to make sure the USB Type-C port supports battery charging and supplying power to the Chromebook, and to check the model’s user manual if you are unsure. Samsung says that if its Chromebook has a USB-C charger, any USB-C port works. Which side to use on older models, and what the charging light means, is on a Chromebook that won’t charge.

How many watts the substitute needs

The number that decides whether a borrowed charger works is its wattage. HP’s guide to its chargers, dated 6 April 2026, lists 45W for its Chromebooks and thin laptops, naming the HP Chromebook 14, Chromebook x360 14 and Chromebook 11, and 65W for standard models. In a Google community thread from April 2023, a Platinum Product Expert wrote that most Chromebooks need at least a 30W charging plug. In HP’s community, a forum member answered a question about the HP Chromebook 14-db0023dx by reading its specifications: it requires a 45W adapter, so 45W or higher should work. The surest figure is the one printed on your own charger; HP says the wattage is usually on the label.

Higher is not a risk with USB Power Delivery, the charging standard HP says all its USB-C chargers use. HP says you can safely use a higher-watt USB-C charger in most cases, because the device consumes only the power it needs, and gives its 65W charger as the example: it delivers 15W, 27W, 60W or 65W depending on what is connected. Plugable explains the mechanism: USB-C Power Delivery starts at 5V and only moves up to 9V, 12V, 15V or 20V once the charger and the device have negotiated it, so chargers do not push power, devices pull it.

Lower is where the trouble starts, and Plugable describes the steps down. A laptop that wants 65W on a 60W charger charges slightly slower. For a laptop that needs more than the charger can give, Plugable says it may charge slowly, or only hold its battery level without gaining, and under heavy load it can still drain while plugged in; in some cases it gains charge only while asleep or off. That matches the person who opened the Google thread above: they had a USB-C charger, but it “doesn’t give enough battery”. USB-IF, which sets the standard, says USB Power Delivery reached 240W with Revision 3.1 in 2021, and was limited to 100W before it.

A phone charger

A phone charger is the substitute closest to hand, and whether it works is the wattage question again. A Google Diamond Product Expert, in the thread above, put it simply: if the Chromebook’s charger is USB-C, any compatible USB-C charger will work, and a phone charger that supports Power Delivery and reaches the watts above is one. A small one may not: Plugable notes that some USB-C ports supply only 1.5A or 3A at 5V, which is 7.5W or 15W. EcoFlow, which sells portable power stations, advises against phone chargers under 30W, saying they often do not provide enough power for Chromebooks.

An older USB-A charger is a slower case. For the Chromebook Pixel (2015), Google says you can charge it from most USB-A ports or USB chargers with a Type-C to Type-A adapter cable, but that these chargers provide less power and take longer than the original. That page is for one model, and on it Google recommends the charger that came with the Chromebook, as Lenovo and ASUS do for theirs.

A power bank or a portable power station

A power bank is a charger with a battery inside, and the same two checks apply: a USB-C output that supports Power Delivery, and enough watts. EcoFlow says the power bank should support at least 30W of Power Delivery output, and recommends a PD charger or power station rated at a minimum of 45W. Both figures come from a company selling those products, so the manufacturer’s number for your Chromebook, or the label on its own charger, is the one to match.

Portable power stations add an AC outlet: EcoFlow says to use the USB-C PD port, or the AC outlet if needed. The AC outlet means plugging in a charger anyway, so the station replaces the wall socket, not the charger.

From a phone, a tablet or another laptop

Google documents this route for one model. The Chromebook Pixel (2015) can charge from a phone, tablet or laptop with a USB Type-C port if that device supports two-way charging: unplug the power adapter, connect the other device, and choose the port it is on, for example USB-C device (left port). Google does not give a rate for it. EcoFlow says a phone’s output for this is often low.

In a car

A car charger is a USB-C charger like the others, and the same checks apply. EcoFlow says a car USB-C PD charger must be rated at 30W or more, and that it only works while the car is on or in accessory mode. HP’s 45W figure for its own Chromebooks is, in our reading, the more cautious target. No Chromebook maker we read gives instructions for charging in a car.

What not to plug in

The makers agree on one thing: they want the charger and cable that came with the Chromebook. Lenovo, on its page for the N21 Chromebook, asks for the cable and adapter that came with it, because “substitute cables by other manufacturers may deliver either more or less power than the Chromebook is engineered for.” ASUS asks for the original adapter and cable, and says to examine the cable for cuts, breaks or fraying and to have a damaged one replaced at a repair center. Samsung says to use the proper charging cable to prevent damage. Google, on the Chromebook Pixel page, says not to plug in a charger whose connector is damaged, because it could permanently damage the device.

Not every charger sold as USB-C behaves like the standard says, either. USB-IF runs compliance testing and keeps a certified product list, and only companies that pass and sign its license may use the certified USB logos. In the HP thread, the forum member called it “50/50” whether any USB-C Power Delivery charger would work, because ports that follow the same standard on paper do not always behave the same in practice. Plugable says early USB-C Power Delivery implementations, starting in 2015, could be unreliable. On the Chromebook Pixel page, Google lists a charger that is getting too hot among the reasons to contact customer support. One user’s account of a faulty charger and a battery fire is on a Chromebook that won’t charge.

Replacing the charger

If the original is lost, the replacement follows the same three checks: the connector, Power Delivery for USB-C, and the wattage. HP says to check the label on the existing charger, look up the laptop model on its site, or use its Power Advisor tool. Google points owners of the Chromebook Pixel (2015) to the Google Store for a new charger. Lenovo and ASUS, on the pages above, ask for the adapter that came with the Chromebook.