Best Power Banks in 2026: Pick by Recharges, Not mAh — Everyday 10K, Qi2 Magnetic, and Travel Picks
A power bank's mAh number is quoted at cell voltage, so it overstates what your phone receives. Multiply by roughly 0.8 and divide by your phone's battery to get real recharges. UGREEN Uno and MagFlow, Baseus EnerCore CR11 and PicoGo AM52, and Anker's MagGo line sorted by that math.
この記事の日本語版: 日本語で読む
The mAh number is the wrong number
Every power bank leads with a big mAh figure, and it is the least useful number on the box. Capacity is quoted at the lithium cell’s ~3.7V, but your phone charges over USB at 5V or more, and both the bank’s boost circuit and the phone’s charging circuit take a cut. The industry rule of thumb is that roughly 80% of rated capacity actually reaches the device — sometimes less, especially over wireless.
So the question worth asking is not “how many mAh” but “how many times does this refill my phone?” The arithmetic:
recharges ≈ bank capacity (mAh) × 0.8 ÷ phone battery (mAh)
Applied to the two most common reference phones — the iPhone 16 (~3,561mAh, per regulatory filings) and the Galaxy S25 (4,000mAh, Samsung-published):
| Bank class | Typical rated energy | iPhone 16 | Galaxy S25 | Typical weight class |
|---|---|---|---|---|
| 5,000mAh (pocket/magnetic) | ~18.5 Wh | ~1.1× | ~1.0× | ~100-150g |
| 10,000mAh (everyday) | ~37 Wh | ~2.2× | ~2.0× | ~150-250g |
| 20,000mAh (travel) | ~72-74 Wh | ~4.5× | ~4.0× | ~350-450g |
| 25,000mAh (travel/laptop) | ~90 Wh | ~5.6× | ~5.0× | ~500-620g |
Two consequences follow. First, for daily carry, 10,000mAh is the sweet spot: about two full refills, at a weight you will actually keep in the bag. Second, anything bigger is a travel decision, not an everyday one — and at 20,000mAh+ the wattage question (can it feed a laptop?) starts to matter more than capacity. We covered that class in depth in our 100W+ laptop power bank comparison.
Everyday 10,000mAh: cable included beats cable forgotten
The most useful recent trend in this class is not more watts — it is the built-in cable. A bank whose cable cannot be left at home removes the single most common failure mode of carrying one.
UGREEN Uno Power Bank 10000mAh 30W (built-in USB-C cable). 30W is enough to fast-charge any current iPhone or mid-tier Android at full speed, and the integrated cable means the bank is always complete. UGREEN’s charging line has been the value pick of this class for a couple of years, and the Uno is its everyday face.
Check the UGREEN Uno 10000mAh 30W on Amazon
Check the UGREEN Uno 10000mAh 30W on UGREEN.com
Baseus EnerCore CR11 10000mAh 45W (retractable cable). Same idea, executed with a retractable reel instead of a fixed pigtail, and a 45W ceiling that covers larger Android phones and even a light laptop top-up. The 20,000mAh 100W version of the same design was one of the strongest picks in our laptop-bank comparison; this is its everyday-sized sibling. If you want the retractable-cable concept explained (and its trade-offs), see our retractable chargers and power banks guide.
Check the Baseus EnerCore CR11 10000mAh 45W on Amazon
Check the Baseus EnerCore CR11 10000mAh 45W on Baseus.com
Anker’s 10K line remains the safe default if you prefer the biggest brand in the category: the current Nano and PowerCore 10K models cover the same ground, and Anker’s warranty handling has a long track record. We compared the three brands’ charging hardware head-to-head in Anker vs UGREEN vs Baseus.
Check Anker 10000mAh power banks on Amazon
Magnetic Qi2: the convenience tax is real, and often worth it
A magnetic bank snaps to the back of an iPhone (or a Qi2-capable Android) and charges while you keep using the phone — no cable, no orientation fumbling. The physics tax: wireless transfer wastes more energy as heat, so expect meaningfully fewer refills from the same mAh than the wired table above, and slower charging too.
The current generation splits into two tiers:
- Qi2 (15W) — the baseline magnetic standard; fine for overnight and desk use.
- Qi2.2, marketed as “Qi2 25W” — raises the magnetic ceiling to 25W on supported phones; noticeably better for short top-up sessions.
UGREEN MagFlow Magnetic Power Bank 10000mAh (Qi2 25W) is the straightforward pick of the newer tier: full 10K capacity, the 25W magnetic profile, and a USB-C port for the efficient wired path when you want it.
Check the UGREEN MagFlow 10000mAh Qi2 25W on Amazon
Check the UGREEN MagFlow 10000mAh Qi2 25W on UGREEN.com
Baseus PicoGo AM52 (10,000mAh, Qi2.2, 45W wired) doubles as a small wired fast-charger: 25W on the magnet, 45W over the cable. If one device has to cover both jobs, this is the more flexible shape.
Check the Baseus PicoGo AM52 on Amazon
Check the Baseus PicoGo AM52 on Baseus.com
Anker’s MagGo line is the equivalent family from Anker, in 5K and 10K sizes. For how the Qi2 standard itself works — magnets, profiles, which phones support what — see our Qi2 wireless chargers guide.
Check Anker MagGo power banks on Amazon
A note on 5,000mAh magnetic slims (UGREEN’s MagFlow Air, Baseus PicoGo Ultra-Slim, Anker’s thin MagGo): they are the nicest to carry and the least capable — roughly one refill, minus the wireless losses. Buy one as a phone accessory, not as your only bank.
Travel 20,000mAh+: this is where wattage takes over
Past 20,000mAh the interesting question stops being capacity and becomes sustained USB-C wattage, because this is the class that can feed a laptop. Our detailed comparison of the 100W+ class — UGREEN’s Nexode 200W and 165W, Baseus’ EnerCore CR11 100W, Anker’s Prime 26K — lives in its own article: Power banks that actually charge a laptop.
The short version for phone-first travelers: the UGREEN Nexode 20000mAh 165W with retractable cable is the do-everything pick (about 4-4.5 phone refills, laptop-capable, cable built in), and the Baseus EnerCore CR11 20000mAh 100W undercuts it for the same capacity if 100W is enough.
Check the UGREEN Nexode 20000mAh 165W on Amazon
Check the UGREEN Nexode 20000mAh 165W on UGREEN.com
One regulatory note for this class: US carry-on rules are generous (100Wh without approval — even 25,000mAh banks clear it), but power banks never go in checked bags, and in-flight charging rules have been tightening. The full rules, in Wh with worked examples, are in our power bank airplane rules guide.
Who should buy what
Daily carry, simplest possible: UGREEN Uno 10000mAh 30W — two refills, cable attached, nothing to forget.
Daily carry, more headroom: Baseus EnerCore CR11 10000mAh 45W — the retractable cable plus enough wattage to rescue a laptop in a pinch.
iPhone-first, hate cables: UGREEN MagFlow 10000mAh Qi2 25W or Baseus PicoGo AM52 — accept fewer effective refills for snap-on convenience; the AM52 if you also want a 45W wired charger in the same puck.
Travel and laptops: start from the 100W+ laptop bank comparison — at 20,000mAh+ the wattage, not the capacity, is the purchase decision.
The same logic — buy on how many times it gets you through a day, not on the headline number — is why we cover smartwatches ranked by how often they need a charge the same way.
More charging and travel gear guides are on gadget-hub.jp English.
Frequently Asked Questions
- Q: How many times will a 10,000mAh power bank charge my phone?
- A: Roughly twice. The rated mAh is measured at the cell's ~3.7V, and boosting it to USB voltage plus the phone's own charging circuit costs 15-25% of the energy. The common planning rule is capacity × 0.8 ÷ phone battery: a 10,000mAh bank on an iPhone 16 (~3,561mAh) works out to about 2.2 refills, and about 2.0 on a Galaxy S25 (4,000mAh). Treat it as an estimate, not a measurement.
- Q: Is a magnetic (MagSafe/Qi2) power bank worse than a cable one?
- A: It delivers fewer refills from the same capacity, because wireless transfer wastes more energy as heat than a cable does, and it charges more slowly than a wired connection at the same rated wattage. What you get in exchange is no cable at all: the bank snaps to the back of the phone and you keep using it. Most magnetic banks also include a USB-C port, so you can fall back to the efficient wired path when you need it.
- Q: What is Qi2.2, and does it matter for power banks?
- A: Qi2.2 (marketed as Qi2 25W) raises magnetic wireless charging from Qi2's 15W to 25W on supported phones. On power banks it shows up in models like the Baseus PicoGo AM52 and UGREEN's MagFlow 25W line. It matters most for topping up quickly in short sessions; if you mostly charge overnight or by cable, plain Qi2 15W is fine.
- Q: Can I take these power banks on a plane in the US?
- A: Yes. FAA guidance allows lithium-ion power banks up to 100Wh in carry-on baggage without airline approval, and every phone-class bank here is far under that line — a 10,000mAh bank is roughly 37Wh and a 20,000mAh bank roughly 72-74Wh. Power banks must never go in checked bags, and several airlines have recently tightened rules about charging devices in-flight, so check your carrier's current policy.
- Q: Should I buy a bigger bank just to be safe?
- A: Only if you will actually carry it. A 20,000mAh bank is typically 350-450g — two to three times the weight of a 10,000mAh model — and the extra capacity does nothing in a drawer at home. The practical split: 10,000mAh for daily carry (about two phone refills), 20,000mAh+ only for travel days and laptops. Weight you will not carry is capacity you do not have.