The Complete Portable Charger Buying Guide: Capacity, Speed and What Matters

Portable chargers have evolved into sophisticated devices with multiple ports, fast charging, and massive capacities. Here's everything you need to know to buy the right one.

Capacity Guide (mAh)

• 5,000 mAh: About 1 phone charge. Pocket-friendly. Good for daily carry.
• 10,000 mAh: 2-3 phone charges. Sweet spot for most users.
• 20,000 mAh: 4-5 phone charges. Good for travel or multiple devices.
• 26,800 mAh+: Maximum airline carry-on limit. For long trips.

Charging Speed

Output wattage determines how fast it charges your device. 18W fast-charges most phones. 30W charges some laptops. 65W charges most laptops at full speed. Match to your devices' maximum input.

Input Speed (How Fast It Recharges)

Often overlooked. A 20,000 mAh bank with 5W input takes 12+ hours to recharge. Look for 18W+ input via USB-C.

GaN Technology

Gallium Nitride chargers are smaller, run cooler, and are more efficient than traditional silicon. Worth paying a slight premium for.

The Airline Rule

Power banks over 100Wh (roughly 26,800 mAh at 3.7V) require airline permission. Under 100Wh can go in carry-on without permission. Check before traveling internationally.

Brands Worth Trusting

Anker, Baseus, Ugreen, and Belkin have consistent quality control. Avoid no-name brands — battery safety is not an area to cheap out.

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