Best Power Banks for Laptops (2026), Measured
For most laptop users the Anker Prime 20,000mAh (250W) is the best power bank, because it delivered the most usable energy in our tests (a measured 62.1 Wh) while sustaining 100W on two USB-C ports at once. If you want the lightest pack that still charges a laptop, the UGreen 145W 20K weighs 41 g less for only 4.2 Wh less usable energy.
Updated · how we test
| # | Product | Best for | Measured usable energy |
|---|---|---|---|
| 1 | Anker Prime 20,000mAh (250W) | Best overall | 62.1 Wh |
| 2 | UGreen 145W Power Bank 20,000mAh | Best power-to-weight | 57.9 Wh |
The short answer
If you charge a USB-C laptop away from an outlet, buy the Anker Prime 20,000mAh (250W). It gave the most measured usable energy of any pack we tested and holds 100W on two ports simultaneously. Pick the UGreen 145W 20K instead if you want the best usable energy per gram.
How we ranked them
Every pack was discharged at a constant 15W into a Power-Z KM003C, three runs each, and ranked on measured usable energy (Wh), sustained per-port wattage, and measured weight — not on the rated numbers printed on the box. Full procedure: power bank methodology.