Anker 737 PowerCore 24K

Most power banks marketed for travel are fine until they're not — capacity drift, indicator miscalibration, and gradual degradation are the real problems. The 737 solves all three in one bank: proven long-term reliability across 16,000+ owner reviews, a real-percentage digital display that doesn't lie to you about remaining charge, and enough output to fast-charge a laptop on the same trip. The capacity is sized for a full travel day with a device load that includes a MacBook, not just a phone. Expensive, but the bank you can actually count on.