The Tiny Brick That Saves Your Bacon
Anker’s 621 Magnetic Battery (MagGo) is a slim 5,000 mAh MagSafe-compatible pack that actually feels pocketable, even on big iPhones. It will not replace your massive weekend power station, but as an everyday or travel backup that snaps on and stays put, it is a seriously handy little sidekick.
What We Liked 👍
- Super slim and pocket friendly
- Strong magnetic attachment on iPhones
- Works with MagSafe iPhones, incl. 17
- Can charge via USB C cable
- Charges from empty in about 2.5 hours
- Backed by 24 month warranty
What Could Be Better 👎
- 5,000mAh is one full-ish charge
- Can get warm during wireless use
- Best mainly for MagSafe iPhones
- No multi device charging
- Not ideal as all day power source
The Power Bank That Actually Fits in Dad Jeans
Most power banks say they are portable, then you clip one to your phone and suddenly you are holding a sandwich. The Anker 621 Magnetic Battery goes the other way. Thanks to Anker’s MiniCell tech, it squeezes 5,000 mAh into a body that is roughly 10.5 by 6.6 by 1.1 cm and around 140 g. Translation: it actually passes the pocket test, even when it is snapped on your phone. Buyers keep mentioning how easy it is to toss in a lunch bag, purse, or jeans pocket without feeling like you packed a brick.
It snaps magnetically to MagSafe compatible iPhones, including the iPhone 15 series and newer models like the iPhone 16 and iPhone 17. The magnets are reported as very strong, with people happily taking selfies, calls, and wandering around without worrying it will fall off. You get about one solid charge or roughly a good boost on big Pro Max style phones. This is the kind of backup you use to get through a long day of travel, not to power a weekend camping trip.
Magnetic Snap, No Cable Trap
Feature wise, it is pretty straightforward, in a good way. It uses MagSafe compatible wireless charging, so you just line it up and it “clicks” into the right spot. That helps avoid the classic wireless charging problem where you wake up to a phone that was perfectly placed 2 cm to the left. If you want faster or cooler charging, there is a USB C port on the bottom, so you can plug a cable into your phone and use it like a normal power bank.
The battery is 5,000 mAh, with up to 2.4 A output and a rated 2.5 hour charge time for the pack itself. Buyers do report that it can get warm, especially during wireless charging, and some note that their phones may pause charging if both are hot and under heavy use. In other words, it is happiest when you clip it on, set the phone down, and let it work. You also get a USB C to USB C cable in the box and Anker’s 24 month limited warranty, which is nice reassurance for a gadget that will live in bags, pockets, and airport seats.
So, Should You Stick This To Your Phone?
If you have a MagSafe iPhone like the 15 series, 16, 17 or similar, travel a lot, and want a power bank that truly fits in your pocket instead of your carry on, this is a great pick. It is perfect for commuters, students, parents navigating theme parks, and anyone who wants a slim emergency top up that snaps on and stays out of the way. Skip it if you need to charge multiple devices, want two or three full phone charges in a day, or primarily use Android without caring about the magnetic attachment. Think of this as your everyday spare tire, not a full-size backup battery, and you will be a happy camper… with a charged phone for all the campsite photos.
