Anker 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.

Update: customer service provided me a replacement since the one I got was not working properly. I was expecting more from anker. I bought another one that was smaller and cheaper that performed better than this one. It gave me only 33% of charge in 2 hours once and 40% in 2h30 another time. It is ok to have for emergencies, the magnet is strong and is lightweight but for the price there’s better options out there.

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.

You get what you pay for. This portable charger is not only slow; it's also unreliable. It's not bulky, making it highly portable and fitting securely in your pocket. Still, it can't fully charge your phone, which becomes the little engine that could, struggling up that hill to take your phone from 30% to barely 70%, depending on whether you're using it. I don't believe it's versatile at all, and even charging it takes time. Overall, don't expect too much from this charger, and you'll be fine. Because if you're looking for something that will fully charge your phone in minutes, this ain't it. I can recommend it if you need something right away or for an outing, but I cannot recommend it as a regular way to ensure you always have battery life. Also make sure you have a phone case thats compatible with it that allows you to charge phone just having those rings will not charge your phone at all.

Just received this to replace another same type battery but that one would go on then just shut off for no apparent reason. I do have an IP-12 and i use a pretty heavy case so i wasn't sure how these type of batteries were going to work. I installed the metal ring on back of case and as it held battery ok it just wouldn't charge. So i bought this Anker to try it as i do like Anker batteries. Well right away it stuck right to my case and immediately started to charge. I was still skeptical. I just waiting to see if it shuts off and it never really did. Yes it gets warm just like the other battery, but that's the characteristic of this type of charging. But I have to tell you this thing grips much better than the other battery I had, maybe it has something to do with being a MagSafe battery I don't know that's why I wanted to try the Anker as its not a Magsafe but a Maggo and boast that it has a much stronger magnet, and I can Contest to that. It's not the fastest charger but it does charge. It is probably taking me an hour and a half hour to go from 60% to 95% for me that's OK. It's meant to be more of a rescue battery to basically get you through the rest of your day, my phone that has relatively small battery. This battery probably would charge it fully but The newer phones have larger batteries. This probably will maybe get you 80% which is just enough to get you through the rest of your day. Yes, heat is a factor and some people complain about it and some people understand It's a necessary phenomenon in this kind of charging, this case with the heat temperature gun i saw 134 degrees at its peak but it does go thru cycles of heat and cool as internal thermostat kicks in. To me thats a minor inconvenience, but it does not heat up your phone. The heat stays within the battery itself and it does not radiate to your phone. So far so good i using it now to write this and as the charge percent is not rising as fast as it did when I wasn't using the phone. It's basically holding the percent at one particular spot right now. So in closing, if you have a heavy duty case, try it, it might work get the rings and put them on the back of your case and see what happens. My rings came with a template which is not easy to use with a heavier case so what I did is I attach the ring to the actual battery And I moved the battery on the back of the case where I found a nice spot where the phone always went on charge every time I hit that spot and then I remove the plastic on the ring went back to push the battery down on that spot removed it push the ring down by hand make sure it was good And that's it, sometimes that's more accurate than using a template. I do agree that the thickness of the case plays a big roll in whether this will work or not, but what do you got to lose if it doesn't work you can return the battery or buy a new case that's thinner and will work better.

The size is perfectly slim for use while on the phone. I bought this to replace another cheaper brand that stopped working. The Anker brand has a reputation of quality and reliability. It works well as an emergency power backup, however it seems to turn off at 85%. I am wondering if that is by design, to conserve battery life or maybe to reduce heat buildup when charging. Either way, I am taking one star off in case that isn't intended.

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

Perfect little power bank for on the go. It snaps magnetically to my phone and stays securely in place great for travel or busy days out. Charges quickly and doesn’t add much weight. I love the slim design and how easy it is to slip into a pocket or bag. Reliable and well-built, as expected from Anker!

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