Anker Prime Power Bank, 26,250mAh 300W Fast Charging

Why it's worth it

At 26,250mAh, or 99.75Wh, this is about as big as a power bank gets while still flying without airline approval. It pushes 300W across three ports and 140W from one of them, so two laptops can charge at once, and it refills itself to half in roughly 13 minutes.

If you work on a laptop while you travel, this is the one. A single USB-C port delivers up to 140W, which is full speed for a 16-inch MacBook Pro, and Anker says 27 minutes gets an M4 Pro to half. Total output is 300W across two USB-C ports and a USB-A, so your laptop, phone and tablet all charge properly instead of politely taking turns.

The input is the part people underrate. Dual USB-C charging at up to 250W takes the bank to 50 percent in about 13 minutes — roughly the length of a boarding line. Most banks this size need hours. That changes how you use it. You top it up at the gate instead of babysitting it in a hotel the night before.

From our review of 8 travel power banks, by Ben Carter, Tech Editor

What we like

• +If you work on a laptop while you travel, this is the one
• +The input is the part people underrate
• +The screen and app are genuinely useful on a trip
• +That 99.75Wh figure is the whole point

What to know

• –It's heavy — about a pound and a third, roughly a small hardcover
• –It's also the most expensive option here by a wide margin, and the magnetic charging base that owners love is sold separately