August 13, 2026 · 16 chargers tested
Gold Tested
We measured actual milliamp-hours delivered to a device, not what's printed on the label. The gap is larger than you think — a battery labeled 20,000 mAh typically delivers 12,000-14,000 usable mAh due to voltage conversion losses.
Anker 737 Power Bank by Anker
The Anker 737 delivered 88% of its rated capacity — the highest efficiency we measured. Its 140W USB-C output charges a MacBook Air in under two hours, and it can charge three devices simultaneously w
We discharged each power bank completely into a USB load tester, measuring actual energy delivered in watt-hours. We tested charging speed to an iPhone 15 and MacBook Air, measured recharge time, and weighed each unit.
The Anker 737 delivered 88% of its rated capacity — the highest efficiency we measured. Its 140W USB-C output charges a MacBook Air in under two hours, and it can charge three devices simultaneously without throttling.
Specifications
| Capacity | 24,000 mAh / 86.4 Wh |
| Output | 140W USB-C + 2 × USB-A |
| Input | 140W USB-C |
| Display | LED percentage |
| Weight | 1.3 lbs |
| Airline approved | Yes |
The Anker 737 Power Bank earns our top pick because it outperformed the competition in the metrics that matter most. At an overall score of 9.2 against a category average of 7.0, the gap speaks for itself. If you are looking for the best in this category, start here.
Anker