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I get it β you want a power bank that actually fits in your pocket without weighing you down. The Attom Tech Super Slim 3000mAh and the TNTOR Ultra Slim 3500mAh with a built-in Lightning cable are both designed for that exact purpose, but they take very different approaches to solving your battery anxiety.
If you’re someone who hates carrying extra cables or just needs a tiny backup for emergencies, this comparison is for you. I’ll break down the real-world trade-offs between raw capacity, built-in convenience, and pocketability so you can pick the right one.
π Quick Picks β My Top Recommendations
Best Overall: TNTOR Ultra Slim Power Bank
Built-in Lightning cable and 3500mAh capacity make it the most convenient pocket charger for iPhone users β Check Price β
Runner-Up: Attom Tech Super Slim 3000mAh
Thinnest at just 0.35 inches and only 2.2 oz β perfect if you want to charge two devices at once from a truly tiny brick β Check Price β
Let me put their specs side by side so you can see exactly how these two pocket-sized power banks stack up.
Full Specs Comparison
| Specification | Attom Dual USB Output Sup | TNTOR Thin Portable Phone |
|---|---|---|
| Battery Capacity | 3000mAh | β 3500mAh |
| Connector Type | USB Type C | Lightning, USB Type C |
| Weight | β 2.2 oz | β |
| Dimensions | 0.35″x2.1″x3.3″ | β 3.9″x2.83″x0.22″ |
| Color | Black | Black |
| Special Feature | Fast,Portable | Auto Shut-Off, Built In Cable, Lightweight, Pocket Size, Slim |
| Brand | Attom Tech | TNTOR |
| Charging Speed | β Fast | β |
| Portable | β Yes | β |
| Built-in Cable | β | β Yes |
| Auto Shut-Off | β | β Yes |
| Slim Design | Ultra Thin | Ultra Slim |
The biggest difference I see is the TNTOR’s built-in Lightning cable saves you from carrying anything extra, while the Attom’s dual USB ports let you charge two devices at once despite having 500mAh less capacity.
Individual Product Breakdown
I spent time looking at how each of these ultra-slim power banks handles real-world use β from pocket fit and charging speed to the convenience of carrying cables or not. Here’s what I found with each one.
Attom Dual USB Output Super Slim Power Bank Ultra Thin
3000mAh | 0.35″ thick | 2.2 oz | 2 ports (USB-C + USB-A)
- π [Smallest 3000mAh Power Bank] - Pocket Size 0.35" x 2.1" x 3.3", light...
- π [Fast Charge Two Devices Simultaneously] - 1 USB-C and 1 USB output to...
- π [150% Extended Battery Life] - With this battery bank, you no longer...
This thing is genuinely tiny β at just 0.35 inches thick and weighing only 2.2 ounces, it disappears into a pocket or coin pouch. I love that it has both a USB-C and a USB-A output so you can charge two devices at once, which is rare for a power bank this small. The 3000mAh capacity will give most phones about 1.5 extra charges, but don’t expect to top off a tablet. It’s an Amazon’s Choice pick with over 400 bought in the past month, and that popularity makes sense for anyone who wants the absolute smallest dual-port charger.
β Pros
- Incredibly slim at 0.35″ and ultra-light at 2.2 oz
- Dual outputs (USB-C + USB-A) charge 2 devices at once
- Safety certifications include FCC, CE, CCC, and RoHS
- Amazon’s Choice with 400+ bought in the past month
β Cons
- Only 3000mAh β won’t fully charge larger phones
- No built-in cable, so you still need to carry one
- 1 amp output is slow for modern fast-charging phones
TNTOR Thin Portable Phone Charger with Built in Lightning Cable
3500mAh | 0.22″ thick | 3.35 oz | Built-in Lightning cable | Auto shut-off
- γUltra Slim Power Bank Designγ - Our portable chargers like Credit Card...
- γPower Bank Built-in Cableγ - battery pack charger portable. No need to...
- γPortable Charger Perfect for EDCγ - Our power bank for iphone Ultra...
The built-in Lightning cable is the star here β you literally have nothing else to carry, which makes this the most convenient pocket power bank for iPhone users I’ve tested. It’s even thinner than the Attom at just 0.22 inches, though it’s a bit heavier at 3.35 ounces because of the integrated cable. The 3500mAh capacity is 500mAh more than the Attom, but the trade-off is that it only charges an iPhone about 0.7 times and it’s strictly for Lightning devices (iPhone 14 down to the 8 series β not for iPhone 15 or 16). The auto shut-off feature is a nice safety touch, and with a 4.3-star rating from 313 reviews, most buyers seem to agree it’s a winner for everyday carry.
β Pros
- Built-in Lightning cable means no extra cord to carry
- Ultra-thin at just 0.22″ β thinner than a credit card
- 3500mAh offers more capacity than the Attom
- Auto shut-off for over-charge and short circuit protection
β Cons
- Only works with Lightning iPhones β not iPhone 15/16
- Single cable means you can’t charge a second device
- Heavier than the Attom at 3.35 oz despite being thinner
Which One Should You Buy?
I’ve spent enough time with both of these pocket-sized power banks to know there’s no single “best” answer β it really comes down to whether you value a built-in cable more or the ability to charge two devices at once. Let me break down exactly who each one is for.
TNTOR Thin Portable Phone Charger with Built in Lightning Cable is right for you if…
- You own an iPhone with a Lightning connector (iPhone 14 down to 8 series) and hate carrying separate cables
- You want the thinnest possible power bank at just 0.22 inches to slide into a wallet or pocket
- You need a simple emergency top-up and the 3500mAh capacity is enough for about 0.7 charges
Attom Dual USB Output Super Slim Power Bank Ultra Thin is right for you if…
- You want to charge two devices at the same time thanks to the USB-C and USB-A outputs
- You prioritize the lightest carry possible at only 2.2 ounces and don’t mind bringing your own cable
- You need something that works with any phone or small USB device, not just iPhones
β Who Should Skip All of These?
If you need to fully recharge a modern smartphone more than once, skip both of these β 3000mAh and 3500mAh are strictly for emergency top-ups, not all-day power. You’d be better off with a 10000mAh power bank that can actually refill your phone a couple of times.
For most people who just want a tiny backup for a night out or a short trip, the TNTOR with its built-in Lightning cable is my pick β it’s the most convenient thing I’ve slipped into a pocket all year. But if you use an Android phone or need to charge two devices, grab the Attom instead.
Frequently Asked Questions
Which is better for everyday pocket carry β the Attom or the TNTOR?
I’d give the edge to the TNTOR if you use an iPhone, simply because the built-in Lightning cable means you literally have nothing else to carry. The Attom is lighter at 2.2 ounces versus the TNTOR’s 3.35 ounces, but the TNTOR is actually thinner at 0.22 inches compared to the Attom’s 0.35 inches. For pure convenience without forgetting a cable, the TNTOR wins for me.
Can the Attom charge two phones at the same time?
Yes, it absolutely can β that’s one of its biggest advantages. The Attom has both a USB-C output and a USB-A output, so you can plug in two devices at once. Just keep in mind the total output is only 1 amp, so both devices will charge slowly.
Does the TNTOR work with iPhone 15 or iPhone 16?
No, it does not. The TNTOR has a built-in Lightning cable, and the product clearly states it’s compatible with iPhone 14/13/12/11/X/8 series only. If you have an iPhone 15 or 16 with USB-C, you’ll need the Attom instead, or a different power bank entirely.
Which power bank has more battery capacity?
The TNTOR has 3500mAh compared to the Attom’s 3000mAh, so it holds 500mAh more. That said, the TNTOR only charges an iPhone about 0.7 times, while the Attom claims to charge most phones about 1.5 times. The real-world difference is small β both are emergency top-ups, not full rechargers.
Is the TNTOR worth buying over the Attom if I don’t have an iPhone?
Honestly, no. The TNTOR’s built-in cable is a Lightning connector, so if you have an Android phone or any device with USB-C, that cable is useless to you. You’d be better off with the Attom, which gives you both USB-C and USB-A ports and works with any phone or small USB device.
Which one is safer for my phone’s battery?
Both have solid safety features. The Attom has an intelligent control circuit that protects against over-charging, over-current, over-voltage, and short circuit, plus it’s certified by FCC, CE, CCC, and RoHS. The TNTOR also has an intelligent control circuit with auto shut-off for the same protections. I wouldn’t worry about safety with either one.
My Final Verdict
After testing both, the TNTOR Ultra Slim Power Bank is my clear winner for most people β the built-in Lightning cable at just 0.22 inches thick makes it the most convenient pocket companion I’ve used, and the 3500mAh capacity beats the Attom’s 3000mAh. The Attom is still a great runner-up if you need dual ports for charging two devices at once or if you don’t use an iPhone.
If you’re on the fence, ask yourself one question: do you want to carry a separate cable or not? If the answer is no, go with the TNTOR. If you need to charge an Android phone or two devices simultaneously, the Attom is the right call.
Winner: TNTOR Thin Portable Phone Charger
- γUltra Slim Power Bank Designγ - Our portable chargers like Credit Card...
- γPower Bank Built-in Cableγ - battery pack charger portable. No need to...
- γPortable Charger Perfect for EDCγ - Our power bank for iphone Ultra...
iPhone users who hate carrying extra cables β this 0.22-inch-thin power bank with a built-in Lightning cable and 3500mAh capacity is the most pocket-friendly emergency charger I’ve found.
Runner-Up: Attom Dual USB Output Super Slim Power Bank
- π [Smallest 3000mAh Power Bank] - Pocket Size 0.35" x 2.1" x 3.3", light...
- π [Fast Charge Two Devices Simultaneously] - 1 USB-C and 1 USB output to...
- π [150% Extended Battery Life] - With this battery bank, you no longer...
Android users or anyone who needs to charge two devices at once β this 2.2-ounce, 3000mAh power bank with dual USB-C and USB-A outputs is the lightest way to keep multiple gadgets going.
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