How long will a portable power station run a laptop?

Short answer: probably longer than these tables say, and for a light laptop even a small station gets close to a working day. Every number on this page assumes the laptop pulls its charger’s full rating the whole time, and in normal use it usually pulls less. Even on that worst case, a Apple MacBook Air 13-inch (M4, 2025) on an EcoFlow RIVER 3 gets 7.0 hours, most of a working day. A gaming laptop is a different story. A ASUS ROG Zephyrus G14 (2022, GA402) running flat out would empty an EcoFlow RIVER 3 Plus in about 1.0 hours.

Why these are worst-case numbers

Laptop makers don’t publish what their machines draw on a normal day. What they do publish is the rating of the charger in the box, so that’s what we have. A charger rating is the most it can deliver, and a laptop usually draws less than that. We don’t have a figure for what any of these pull while you browse or write.

So read every row here as a floor. If the table says a station covers your day, it will. If it says you’ll come up short, you may still be fine, but we can’t tell you by how much, because we don’t have a typical draw figure for any of these machines.

The rest is the same as on our other runtime pages. Everything is calculated, not measured: the station’s rated capacity, times an efficiency factor for the AC inverter (our assumption, printed under each table), divided by the charger rating. We haven’t run these laptops on these stations ourselves.

AC outlet or USB-C?

The tables are AC only, because that’s the path we model for laptops: the station’s inverter feeding the laptop’s own charger. If your laptop charges over USB-C and your station has a USB-C port that can supply what the laptop asks for, plugging straight into that skips the inverter. We don’t model that path. We don’t have USB-C port ratings in our data yet, so check your station’s manual before you count on it.

Runtime by laptop

We picked five stations, leaning toward the small end, because that’s where laptop buyers usually look. The runtime calculator covers the rest of the stations in our data.

Apple MacBook Air 13-inch (M4, 2025)

Apple ships this Air with different chargers depending on the configuration, and offers a faster one as an option. We used the smallest bundled one, shown in the Mode column. Even on its full rating, the small stations get close to a workday and the bigger ones go past it.

Lenovo ThinkPad T14 Gen 6 (Intel)

Lenovo lists a USB-C adapter for the T14, and which one you get depends on the country. On that rating, the small stations cover a few hours and the mid-size ones a long working day. Normal use should stretch both.

Apple MacBook Pro 16-inch (2024, M4 Pro/Max)

The 16-inch Pro comes with a big charger, and the worst-case hours drop to match. A Pro doing everyday work will usually sit below its charger’s rating. If you edit video or compile all day on battery, the table gets closer to the truth.

ASUS ROG Zephyrus G14 (2022, GA402)

These rows are for the 2022 G14 (GA402) and its adapter. Later G14 models come with different adapters, so this table doesn’t cover them. A gaming laptop only gets near its adapter rating with the CPU and graphics both under load. A demanding game can do that, so here the worst case is closer to real life. A small station gives you an hour or so of that.

Which size to get

For a light laptop like the Air, the small stations like the EcoFlow RIVER 3 and EcoFlow RIVER 3 Plus get close to a day of work, even on our worst-case numbers. For the ThinkPad they’re a few hours at full rating, and probably a good deal more in everyday use. Go bigger only if the same station also has to run lights, a fridge or a Starlink dish, or if you want several days without a recharge.

For a gaming laptop or a 16-inch workstation that you actually push, a mid-size station like the EcoFlow DELTA 2 or Jackery Explorer 1000 v2 is the sensible start.