How to Choose a Power Bank: The Complete Buying Guide (2026)
Everything you need to consider before buying a portable charger. Capacity, output, form factor, and the features that actually matter.
The four things that matter most.
Buying a power bank in 2026 is overwhelming. Hundreds of options, conflicting specs, confusing marketing. We've simplified it: focus on four things — capacity, output wattage, form factor, and what's built in. Get those right, and the rest is detail.
What matters.
Capacity (mAh)
5,000–10,000 mAh covers daily use. 20,000+ for multi-day or laptops.
Output (W)
18W minimum for fast phone charging. 30W+ for fast iPad. 65W+ for laptops.
Form factor
Thin (~6mm) for daily carry. Brick (15mm+) for backpack travel.
How much mAh do you need?
5,000 mAh = approximately one full charge for most modern phones. 10,000 mAh = 2–3 phone charges. 20,000 mAh = a phone, tablet, and earbuds. The Clutch Pro at 5,000 mAh covers daily use for most people.
Wattage and PD.
USB-C Power Delivery (PD) is the modern fast-charging standard. The iPhone 15 supports 27W; the Galaxy S25 supports 45W; the iPad Pro supports 30W+; MacBook Air needs 30W minimum. The Clutch Pro outputs 18W PD — plenty for phones, light for tablets.
What's the difference?
Built-in cable chargers (like the Clutch Pro) integrate a cable into the body. No separate cord to lose. Separate-cable chargers require you to pack your own cable. For travel and daily carry, built-in is dramatically more convenient.
15 colors. Pick yours.
The buying-guide verdict.
For most buyers, the right answer is a slim, MagSafe-capable charger with a built-in cable — like the Clutch Pro at $49.99. It covers daily use, travel, and doesn't require carrying extra cables.
Shop the Clutch ProFrequently asked
How many mAh do I need?
For daily phone use, 5,000 mAh covers one full top-up. For multi-day trips or charging multiple devices, look at 10,000–20,000 mAh.
Is 18W enough for fast charging?
Yes for phones. The iPhone 15 max-charges at 27W; the Clutch Pro outputs 18W (same as Apple's standard charger). For laptops, you'll want 30W+.
What's the difference between mAh and Wh?
mAh measures battery capacity. Wh measures total energy. For TSA, the 100 Wh limit matters; Wh = (mAh / 1000) × 3.7V.
Do I need MagSafe?
If you have an iPhone 12 or later and frequently charge while moving, yes. For desk-only charging, MagSafe is optional.
Reviewed by The Clutch Team · May 2026
Shop the Clutch Pro — $49.99