621 Magnetic Portable Charger (MagGo), 5,000mAh Wireless Power Bank with USB-C Cable, Magsafe-Compatible Battery Pack for iPhone 16/15/14/13/12 Series

This was my first Magsafe battery. I had some older Qi wireless chargers and was familiar with heating issues. But these were older and lower power. Without the Magsafe feature, they were finicky and fussy and didn't properly fit around camera lens protrusions. I barely used these devices. This Anker 621 has a lot of promise. The Magsafe feature locks tight and the dimensions do not interfere with the camera protrusions, even with a case on the phone. It's compact and slim, and most importantly, does not require wires. It can be easily carried in a backpack or pocket without an accessory bag for wires and cables. When I first unpacked the battery, I fully charged with with a USB-C PD charger. It charged at 1A/5V. I used it to inductively charge my iPhone 14 Pro intermittently over the next few days. After about 10% charge, I determined the heat buildup to be intolerable. Therefore, I only used the pack intermittently. That worked fine for me over several days. When the battery was empty, it took 20Wh to fully charge. The battery was advertised for 5000mAh, which is impossible to measure without disassembling the unit. However, we can calculate 20Wh / 5V / 0.9 = 4400mAh (where 0.9 is the efficiency of the voltage converter for USB). This is below advertised capacity, but there’s a lot of assumptions in the conversion. Then I used a USB-C cable to charge my iPad Mini. It transferred 14.8Wh at about 9 Watts before exhausting. The round-trip efficiency was high, because recharging took 14.8Wh to fully recharge. I suspect I didn’t get the full 20Wh capacity with the iPad because the higher charge demand choked the battery before it could get fully empty. Using the inductive charge mode, both devices get hot relatively quickly. The switching power electronics get particularly hot. I can easily feel where the transistor is located beneath the plastic shell. The inductive transmitter loop gets warm on the battery and the receiver loop gets warm on the phone. Lithium-ion batteries degrade proportionally to temperature (the Arrhenius relationship), accelerating +25% degradation rate for every 10C, this is bad for the phone. In summary, • The battery delivers 20Wh of energy. If using inductive (Qi and Magsafe), much of the energy is converted to heat, so perhaps only 10-15Wh is actually delivered to the battery. • If using high-current devices using a charge cable, such as an iPad, the high current chokes the battery a bit early, stopping at 15Wh. • My back-of-the-envelope calculation shows 4400mAh vs. rated 5000mAh. I suspect the battery is not delivering rated capacity. Anker should be rating these batteries in Joules (watt-hours) instead of Coulombs (ampere-hours). • Inductive charging is inefficient, losing a quarter to half of energy to heat. This is not Anker’s fault but a result of real-world physics. With my iPhone 14 Pro, I saw about 10C rise per 10% of battery charge. I never let it progress beyond this point. • Lithium-ion batteries accelerate aging degradation due to the Arrhenius relationship about +25% per 10C temperature rise. Therefore, prolonged use of inductive charging will ultimately age your battery prematurely. • This battery is very worthwhile because I don’t have to carry an accessory kit with wires to use. Just slap it on the back of the phone and go. Plus, if frees the connector to use with wired headsets when using.

I’ve never had an attaching external battery before. It’s so nice. No problems. Attractive design. Nice feel. Did not come fully charged (probably required for air shipping after production)

Easy and compact to use. Lightweight good to carry in a purse. Sticks well seems like a strong magnet. Won’t get a full charge if your battery is almost dead though. Does get a little warm while charging. Pretty color.

I use it with my Pixel 8, and the battery charges normally for its power, and it charges just 1 phone to 100%. I've use it with and without the chord, and for both I would say it does heat a little but nothing to be concerned about or that is annoying. It is small, which I love, it covers the back of my phone completely from below the camera to the end, and from side to side. It's not bulk, and it's really easy to carry around.

UPDATE 3/11/2026 - Anker absolutely honored their commitment to their product and issued me a replacement. They were quick to respond and to mitigate the issue I had with their product. Thank you ANKER!! I’m a huge Anker fan and a loyal consumer of their products, so this is the first time I’ve encountered an issue with one of their products. The charging itself works fine, the problem is that the magnetic charger gets very hot, which disrupts charging until the temperature drops. I have another brand with the same specs that doesn’t have this issue.​​​​​​​​​​​​​​​​

The anker 621 wireless magnetic battery MagGo was perfect for My black iPhone. I got this because I have had Anker products in the past and been very happy with them. I also chose this particular one because it was black, and I wanted it to match my case. It has a very strong secure magnet and the charger instantly links to my phone. The charge speed was quick similar to My rapid charger. It comes with a C type to sea type cable to charge the battery bank having used it while at work it does the job it’s supposed to do. It’s slim enough that it doesn’t feel too different to just having my iPhone in my pocket for the price. I think it is an awesome product which anyone wanting a portable wireless magnetic charging battery should get. Comparing it to my friends Apple MagSafe I would say just as good better in black and less than half the price.

This battery feels great to the touch, it's on the slimmer side, and the MagSafe isn't that bad, I got to give it that, but other than that, it's not worth your $40 dollars. The battery has a small capacity of 5,000mAh, which makes it die quickly, and it charges very slowly, delivering only 7.5 watts to your phone via MagSafe, taking up to 3 hours to fully charge. So if you are out and about, like most of us, and use your phone for a good amount of time, there's a good chance it won't fully charge while you are using it. Which is disappointing considering that Anker was supposed to be a good brand with more quality. I just think there are so many better Magnetic Portable chargers out there for much cheaper, offering double battery life and double charging speeds, all for less than this Anker. I feel disappointed, but I feel so much better about a $20 one I found online.

As the title says it gets hot while charging. The portable charger does recharge itself fast though. I like how its usb C so i dont have to bring 100 different cables and blocks with me. Works on my iphone 15 ProMax and on Samsung phones that are able to wireless charge. It does work on the iphone 11 but the magnet on the phone is not strong enough for it to carry the weight of the portable. Good charger for the price.

Nice and small, does only give around one full charge and the phone tends to get fairly hot though. Magnets are plenty strong, certainly wouldn’t drop off but it can rotate on the phone if it’s in your pocket or something. Feels decent quality too, doesn’t feel like it’d break easy

Product is light weight and slimmest powerbank in the market. material feels very premium. Magnet has good power to hold the mobile.

Amazing and I love the colour. I can even use it as a wire charger for my AirPods and not worry about it sliding off the patch it has magnets

"Nuovo" sistema per caricare al volo il telefono, comodissimo, una svolta preso per iphone 12 pro (che arrancava con la batteria da sostituire) ho trovato il sistema molto molto comodo: addio power bank da tenere in tasca con un filo pensolante, i due si accoppiano e rimangono li saldamente ha i suoi led per capire lo stato ricarica, tasto on-off, porta usb-C che permette la ricarica con tutto pro - il sistema Qi2, veramente una svolta funzionale - batteria piccola e leggera, ricarica diciamo da 0 a 80-85% il 12 pro (2815 mAh e stressata, vita 78%) - anche veloce nella ricarica la batteria immagazzina 5000 mAh, manda energia a 7,5W (quindi ricarica lenta, ma non è un pproblema, anzi) Contro: - nel mentre son passato al pixel 10, che ha lo stesso sistema Qi2, ma avendo 4800mAh, la batteria ricarica lentissima e diciamo che copre da 0 al 55% probabilmente la dispersione in calore si mangia tanta energia tale per cui non copre bene la funzione come su iphone, anche se rimane un ottima batteria di scorta per portabilità e semplicità d'uso

Absolutely brilliant. Place on back of iPhone 15 and it worked immediately. Definitely buying again for family members.