How to choose a power bank in 2026
Most power bank listings shout numbers at you without saying what they mean. Here is the short version: capacity decides how many times you can refill your phone, watts decide how fast, and weight decides whether you actually carry it. Everything else is marketing.
The four things that actually matter
Capacity (mAh) — how many refills
A modern phone battery is roughly 4,000–5,000 mAh, and about 20–25% of a power bank's rated capacity is lost to heat and conversion. So a 5,000 mAh bank realistically gives you about one full phone charge, and a 10,000 mAh bank gives you roughly two.
Output speed (watts) — how fast
Watts decide speed, not capacity. 5W is slow overnight charging, 18–20W tops most phones up to about half in 30 minutes, and 30W+ is what you want if you also charge a tablet or a laptop over USB-C.
Weight and pocketability
Capacity costs grams. A 5,000 mAh bank is around 100–130 g and disappears into a pocket; a 10,000 mAh bank is usually 180–230 g and lives in a bag. Buy the smallest one that covers your day.
Magnetic vs cable
Magnetic (MagSafe-style) banks stick to the back of a compatible iPhone and charge wirelessly, which is convenient but slightly slower and warmer. A USB-C cable is always faster and works with every device.
5,000 mAh or 10,000 mAh?
| Capacity | Phone charges | Typical weight | Best for |
|---|---|---|---|
| 5,000 mAh | ~1 full charge | 100–130 g | Pockets, commutes, nights out |
| 10,000 mAh | ~2 full charges | 180–230 g | Travel days, festivals, two devices |
If you only need to survive from afternoon to bedtime, 5,000 mAh is enough and much nicer to carry. If you fly, hike or share your charger with other people, pay the small step up to 10,000 mAh.
Which Vexytech power bank fits you
Power Bank 5,000 / 10,000 mAh
$27Best for Everyday phone top-ups
The 10,000 mAh option is +$5 and roughly doubles the refills.
View productMagnetic Power Bank
$39Best for iPhone users who hate cables
Snaps on and charges while you keep using the phone.
View product6-in-1 Type-C Hub
$25Best for Charging a laptop setup, not a phone
Pairs with a power bank for travel desk setups.
View product
Common questions
- Why does a 10,000 mAh bank not charge my phone twice exactly?
- Voltage conversion and heat use up roughly 20–25% of the rated capacity, so treat the number on the box as a maximum, not a promise.
- Can I take a power bank on a plane?
- Yes — banks under 100 Wh (roughly 27,000 mAh) are allowed in hand luggage by most airlines. Both of our capacities are far below that limit. Never pack one in checked baggage.
- Is wireless magnetic charging bad for the battery?
- It runs warmer than a cable, which is the thing batteries dislike most. Use magnetic charging for convenience during the day and a cable for long top-ups.
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