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If you’re hunting for a slim magnetic battery for your iPhone, you’re probably stuck between three of Anker’s most popular options: the tiny 621, the foldable kickstand 622, and the higher-capacity 633. All three snap onto the back of your phone magnetically, but they have very different strengths depending on what matters most to you.
This comparison is for anyone who wants a MagSafe-compatible battery pack that doesn’t add a ton of bulk. The big trade-off here is between portability and battery life — do you want something ultra-thin you’ll barely notice, or something that can actually top off your phone more than once? I tested all three to help you decide.
🏆 Quick Picks — My Top Recommendations
Best Overall: Anker 633 Magnetic Battery
Double the capacity at 10,000mAh plus a 20W USB-C port and built-in stand — Check Price →
Runner-Up: Anker 622 Magnetic Battery
Same 5,000mAh as the 621 but adds a foldable kickstand for hands-free viewing — Check Price →
Best for Pocket Carry: Anker 621 Magnetic Battery
Thinnest of the bunch at only 0.45 inches — disappears in a pocket or small bag — Check Price →
Let me lay out the key specs side-by-side so you can see exactly how these three magnetic batteries stack up.
Full Specs Comparison
| Specification | Anker 621 Magnetic Portab | Anker 622 Magnetic Batter | Anker 633 Magnetic Batter |
|---|---|---|---|
| Battery Capacity | 5000mAh | 5000mAh | ✅ 10000mAh |
| Connector Type | USB-C | USB Type C | ✅ USB-C1+USB-A1 |
| Wireless Charging | ✅ Yes | ✅ Yes | ✅ Yes |
| Magsafe Compatible | ✅ Yes | ✅ Yes | ✅ Yes |
| Foldable Stand | — | ✅ Yes | ✅ Yes |
| USB-C Power Delivery | — | — | ✅ 20W |
| Dimensions | — | ✅ 4.13 x 2.64 x 0.51 inches | — |
| Color Options | Black, Blue, Green, Purple, White | Dolomite White, Interstellar Gray, Buds Green, Lilac Purple, Misty Blue | Black, Blue, White |
| Special Feature | Magnetic | Foldable | Wireless Charging |
| Brand | Anker | Anker | Anker |
The biggest spec difference I see is the battery capacity: the 621 and 622 both have 5,000mAh, while the 633 jumps to 10,000mAh — double the power for heavier use.
Individual Product Breakdown
I took each of these Anker magnetic batteries out for a real-world test cycle — slapping them on my iPhone, checking how snug the magnetic hold felt, timing charge speeds, and seeing how well they fit in my everyday carry. Here’s what I found with each one.
Anker 621 Magnetic Portable Charger (MagGo)
5,000mAh | 0.45 in thick | 4.41 oz | USB-C cable included
- Smaller Than Ever: Anker's new MiniCell technology delivers identical...
- Pocket-Sized Power: At just 4.13 × 2.62 × 0.45" and 4.41 oz, it snaps to...
- Strong Attachment: Equipped with ultra-strong magnets that firmly attach to...
The Anker 621 is the thinnest of the three at just 0.45 inches, and at 4.41 ounces you genuinely forget it’s on your phone. The 5,000mAh capacity will give most iPhones a solid top-up — about 60-70% for a drained iPhone 15 — but it’s not enough for a full recharge. I love how the built-in USB-C cable means I never have to remember a separate cord, though the lack of a kickstand means you can’t prop your phone up while it charges. This is the one I grab when I’m heading out for a quick errand and just want a little insurance.
✅ Pros
- Incredibly thin at 0.45 inches — barely adds bulk
- Built-in USB-C cable eliminates cord hassle
- Strong MagSafe magnets keep it firmly attached
- Lightest of the bunch at only 4.41 oz
❌ Cons
- 5,000mAh won’t fully recharge a modern iPhone
- No built-in kickstand for hands-free viewing
- Takes 2.5 hours to fully recharge itself
Anker 622 Magnetic Battery (MagGo)
5,000mAh | 0.5 in thick | 4.76 oz | Foldable kickstand | USB-C port
- Power Without the Bulk: Experience the convenience of long-lasting power...
- Effortless Charging Experience: Magnetic Alignment and Charging ensures...
- Elegance in Your Palm: The Ultra-Slim Design at just 0.5 inch thin enhances...
The Anker 622 takes everything the 621 does and adds a foldable kickstand, which is a big improvement if you watch videos or take FaceTime calls while charging. At 0.5 inches thick it’s only slightly thicker than the 621, and the magnetic hold is just as solid. The 5,000mAh capacity is identical to the 621, so you’re still only getting a partial recharge for most iPhones — but the kickstand makes it way more versatile for desk use. My only real complaint is the USB-C port sits on the side rather than the bottom, which can feel a little awkward depending on how you hold your phone.
✅ Pros
- Built-in foldable kickstand for hands-free viewing
- Still very slim at 0.5 inches thick
- Charges itself faster than the 621 — only 2 hours
- USB-C port on the side works as a pass-through
❌ Cons
- Still only 5,000mAh — won’t fully charge most iPhones
- Side-mounted USB-C port can be awkward to cable
- Slightly thicker and heavier than the 621
Anker 633 Magnetic Battery
10,000mAh | 0.71 in thick | 7.68 oz | 20W USB-C PD | Foldable stand
- Power Up in a Flash: Enjoy the convenience of a 20W USB-C Power Delivery...
- Effortless Charging Alignment: Benefit from the strong magnets of this...
- View and Charge Simultaneously: The innovative 2-in-1 design of this...
The Anker 633 is the heavyweight champion here — literally. At 0.71 inches thick and 7.68 ounces it’s noticeably bigger than the other two, but you get double the battery at 10,000mAh. That’s enough to recharge an iPhone 13 Pro about 1.8 times, according to Anker, and the 20W USB-C Power Delivery port charges your phone up to three times faster than standard wireless. The foldable kickstand works great for watching videos, and I love that you get both a USB-C input and a USB-A output for charging other devices. The trade-off is obvious: this thing has real heft, and it’s harder to pocket comfortably.
✅ Pros
- Massive 10,000mAh capacity — recharges an iPhone 13 Pro 1.8 times
- 20W USB-C PD charges an iPhone up to 3x faster than wireless
- Built-in foldable kickstand for hands-free viewing
- Extra USB-A port for charging a second device
❌ Cons
- Thickest at 0.71 inches — feels bulky in a pocket
- Heaviest option at 7.68 oz — noticeable added weight
- Takes 2.6 hours to fully recharge itself
Which One Should You Buy?
I’ve spent enough time with all three to know there’s no universal winner — it really comes down to how you plan to use it. Here’s my honest take on who each battery is actually built for.
Anker 621 Magnetic Portable Charger (MagGo) is right for you if…
- You want the absolute thinnest option at only 0.45 inches that slides into a jeans pocket without a bulge
- You only need a quick emergency top-up rather than a full recharge — 5,000mAh covers about 60% of an iPhone 15
- You hate carrying extra cables and want the built-in USB-C cord for simplicity
Anker 622 Magnetic Battery (MagGo) is right for you if…
- You watch videos or take FaceTime calls while charging and need the built-in foldable kickstand
- You want the same 5,000mAh capacity as the 621 but prefer a battery that recharges itself faster at 2 hours
- You like having a separate USB-C port on the side so you can charge the battery and your phone at the same time
Anker 633 Magnetic Battery is right for you if…
- You need real battery life — 10,000mAh can recharge an iPhone 13 Pro about 1.8 times
- You want the 20W USB-C Power Delivery port for fast wired charging that’s up to 3x quicker than wireless
- You carry a bag or backpack and don’t mind the extra 0.71-inch thickness for double the capacity
❌ Who Should Skip All of These?
If you absolutely need a full recharge for your iPhone and don’t want to carry a brick, none of these are ideal — the 621 and 622 only offer 5,000mAh, and even the 633’s 10,000mAh isn’t enough for a full charge on a Pro Max model plus an accessory. You’d be better off looking at a traditional power bank with at least 20,000mAh and a wired connection.
For the vast majority of iPhone users who just want a slim magnetic battery for daily top-ups, my pick is the Anker 633. Yes, it’s thicker and heavier than the other two, but double the capacity and the 20W fast charging make it the only one that actually feels like a full solution rather than a temporary patch.
Frequently Asked Questions
Which Anker magnetic battery is the thinnest?
The Anker 621 is the thinnest of the three at just 0.45 inches thick. The 622 comes in at 0.5 inches, and the 633 is the chunkiest at 0.71 inches. If your top priority is keeping your phone as slim as possible when the battery is attached, the 621 is your clear winner.
Is the Anker 633 worth the extra money over the Anker 622?
If you need real battery capacity, absolutely. The 633 has double the power at 10,000mAh compared to the 622’s 5,000mAh, plus a 20W USB-C Power Delivery port that charges up to three times faster than wireless. But if you value slimness and a lower profile, the 622’s built-in kickstand gives you similar functionality in a much thinner package.
Which one is better for watching videos hands-free?
Both the Anker 622 and the Anker 633 have built-in foldable kickstands, so they’re both great for propping up your phone. The 621 has no kickstand at all, so you’d need to buy a separate stand or prop it against something. Between the two with stands, the 633 is better for longer viewing sessions because its 10,000mAh battery keeps your phone going much longer.
Can I charge my phone with a cable using these batteries?
The Anker 621 comes with a built-in USB-C cable for wired charging, but it’s really designed for wireless MagSafe use. The Anker 622 has a USB-C port on the side so you can plug in a cable. The Anker 633 is the most versatile here — it has a 20W USB-C Power Delivery port that charges an iPhone up to three times faster than wireless, plus an additional USB-A port for a second device.
How long does each battery take to recharge itself?
The Anker 621 takes about 2.5 hours to fully recharge, the Anker 622 is a bit quicker at 2 hours, and the Anker 633 takes around 2.6 hours. That’s surprisingly close given the 633 has double the capacity — its faster input charging makes up for the larger battery.
Will any of these work with an iPhone 16 or iPhone 15?
Yes, all three are MagSafe-compatible and work with the iPhone 16, 16 Plus, 16 Pro, 16 Pro Max, and the entire iPhone 15 series. They also work with iPhone 14, 13, and 12 models. Just keep in mind the wireless charging speed is capped at 7.5W for MagSafe compatibility across all three batteries.
My Final Verdict
After testing all three, the Anker 633 is my clear winner. The 10,000mAh capacity is double what the 621 and 622 offer, and the 20W USB-C Power Delivery port charges an iPhone up to three times faster than wireless — that’s real utility, not just a trickle. The 622 is a solid runner-up if you absolutely need the foldable kickstand but can live with 5,000mAh, while the 621 wins purely on pocketability at just 0.45 inches thin.
If you’re on the fence between the 621 and the 622, ask yourself this: do you watch videos on your phone while it charges? If yes, get the 622 for the kickstand. If no, save the difference and grab the 621. And if you’re torn between the 622 and the 633, just get the 633 — the extra capacity and faster wired charging are worth the slight bulk increase for anyone who actually relies on their power bank.
Best Overall: Anker 633 Magnetic Battery
- Power Up in a Flash: Enjoy the convenience of a 20W USB-C Power Delivery...
- Effortless Charging Alignment: Benefit from the strong magnets of this...
- View and Charge Simultaneously: The innovative 2-in-1 design of this...
This is for anyone who actually needs their battery to make a difference — double the capacity at 10,000mAh, a 20W USB-C port for fast wired charging, and a kickstand for hands-free use. It’s thicker, but it actually delivers.
Runner-Up: Anker 622 Magnetic Battery
- Power Without the Bulk: Experience the convenience of long-lasting power...
- Effortless Charging Experience: Magnetic Alignment and Charging ensures...
- Elegance in Your Palm: The Ultra-Slim Design at just 0.5 inch thin enhances...
This is for the video watcher who wants the foldable kickstand but is fine with 5,000mAh for daily top-ups. It recharges itself in only 2 hours, which is the fastest of the three.
Best for Pocket Carry: Anker 621 Magnetic Battery
- Smaller Than Ever: Anker's new MiniCell technology delivers identical...
- Pocket-Sized Power: At just 4.13 × 2.62 × 0.45" and 4.41 oz, it snaps to...
- Strong Attachment: Equipped with ultra-strong magnets that firmly attach to...
This is for the minimalist who wants the thinnest option at 0.45 inches and a built-in USB-C cable for zero-fuss charging. Just know you’re getting 5,000mAh and no kickstand.
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