Best Portable Chargers Under $40 in 2026: 5 Power Banks Worth Buying
Written By
Cool Finds Daily
Cool Finds Daily Editorial Team
Expert Reviewed
Cool Finds Daily Review Process
Independently tested & fact-checked
Updated
May 18, 2026
There are hundreds of portable chargers on Amazon right now and most of them are fine. Thats the problem — “fine” doesnt help you pick one. So I narrowed it down to five that actually stand out for specific reasons: one has a built-in cable, one is tiny enough for a pocket, one charges absurdly fast, and so on. All under $40, all from brands that wont disappear next month.
Quick Jump
1
Anker 621 MagGo 5,000mAh
Best for iPhone Users (MagSafe)
5,000
mAh
7.5W
Wireless
MagSafe
Attach
3.2 oz
Weight
Snaps magnetically to the back of your iPhone and charges wirelessly. No cable to dig out of your bag, no port to fumble with. 5,000mAh gives you roughly one full phone charge, which is enough to survive a day when you forgot to plug in overnight. Its slim enough that you can keep it attached while using your phone — barely adds any bulk. The magnetic hold is strong, doesnt slide off in a pocket. If you use an iPhone 12 or newer, this is the most convenient power bank you can buy at any price.
$27.99
Check Price on Amazon
2
Anker Nano Power Bank 5,000mAh
Best Pocket Size With Built-In Connector
5,000
mAh
Built-in
USB-C/Lightning
Lipstick
Size
3.8 oz
Weight
About the size of a thick lipstick tube with a built-in foldable USB-C connector that plugs directly into your phone. No cables to carry, no ports to remember. Slides into a coin pocket or the small pouch of a backpack. 5,000mAh isnt massive but its one full charge for most phones, which handles the “I’m out all day and forgot to charge” scenario perfectly. The pass-through charging means you can charge the bank and your phone simultaneously from a single wall plug.
$25.99
Check Price on Amazon
3
Baseus 20,000mAh 65W Power Bank
Best Capacity Under $40
20,000
mAh
65W
Output
3 Ports
USB-C + A
LED
Display
20,000mAh at 65W output for under $40 is frankly ridiculous value. This thing can charge a MacBook Air, not just phones. Three ports (2x USB-C, 1x USB-A) so you can top up multiple devices at once. The digital display shows exact percentage remaining instead of vague LED dots. Its heavier than the others on this list (about 14 oz) but thats the trade-off for 4x phone charges worth of juice. Best pick for weekend trips or anyone who carries a laptop.
$35.99
Check Price on Amazon
4
INIU 10,000mAh Slim Power Bank
Best All-Rounder for the Money
10,000
mAh
22.5W
Fast Charge
Slim
Profile
$16
Price
The boring-but-correct answer for most people. 10,000mAh (two full phone charges), 22.5W fast charging, slim enough for a back pocket, and it costs about $16. INIU isnt a flashy brand but theyve sold millions of these things and have a genuinely good track record. If you just want a reliable power bank without overthinking it and dont need laptop charging or MagSafe tricks, this is the one.
$15.99
Check Price on Amazon
5
Nitecore NB10000 Gen 2
Best for Ultralight Travelers and Hikers
10,000
mAh
5.3 oz
Weight
Carbon
Fiber Shell
20W
PD Output
At 5.3 ounces this is one of the lightest 10,000mAh power banks you can buy. The carbon fiber shell makes it feel borderline indestructible despite being so light. Its a cult favorite in the ultralight backpacking community for good reason — shaves meaningful grams compared to standard power banks while still giving you two full phone charges on the trail. 20W PD output means it charges reasonably fast too. Not cheap for a 10K bank, but the weight savings are real.
$39.95
Check Price on Amazon
How to Pick the Right One
Honestly it comes down to answering two questions:
- How much capacity do you need? For daily use where you’re just topping off once, 5,000mAh is fine. For travel days or heavy phone users, go 10,000+. If you’re charging a laptop too, 20,000mAh is the move.
- How much do you care about size? The smallest options (MagGo, Nano) give you one charge in a pocket-friendly package. The biggest (Baseus 20K) gives you four charges but weighs almost a pound.
Dont overthink wattage ratings unless you specifically need laptop charging. For phones, anything 20W+ charges fast enough that you wont notice the difference between 20W and 65W in practice.
Which Should You Buy?
iPhone users who want zero-cable convenience: Anker 621 MagGo. Everyone else who wants the best value per dollar without caring about gimmicks: INIU 10,000mAh at $16 is hard to beat. Weekend travelers or laptop carriers: Baseus 20K at $36 is absurd value for 65W output. Weight-obsessed hikers: Nitecore NB10000 if you can find it under $40.
