ESRfor MagSafe Power Bank, 0.55 in Ultra-Compact 5,000mAh MagSafe Portable Charger, Qi2 15W Ultra-Fast Battery Pack, 20W USB-C MagSlim Charger with Cable for iPhone 17/16/15/14/13/12, Black

This charger like other 5000 mah magnetic chargers does get somewhat warm while in use. It works well and fully charged my iPhone 16 pro. Recharges quickly when using a PD charger. It will charge the phone faster with a type c to type c cable. It is not as thin as some similar batteries but fits in a pocket nicely.

I got this as a backup plan for my IPhone 13 which has a faulty Lightning port; it can still be charged via MagSafe. This charger was less than $12.50 with a recent special offer, so I figured nothing much to lose versus those costing much more, and which might only see occasional use.A few things of note; not complaints but initial observations and impressions:- The unit takes a while to charge itself, even with a 15W USB-C charger. Unit arrived with less than 50% charge (which is normal); I’ve had it charging for over an hour and still not quite full (over 75%).I imagine it would charge faster if there were a higher-wattage input.- When both plugged in for charging, and also MagSafe charging a phone, the phone being charged will show “Slow Charger”. I assume this is normal when using a 15W charging input.This _may_ make it less-than-suitable as a regular charging pad if it does not deliver 15W MagSafe charging when plugged in.- When the USB-C is NOT connected, the phone will then charge in 15W mode. Haven’t yet tested to see how long to fully charge a phone.- Seems like nice lightweight but sturdy construction. The look and feel are quite nice, although everything but the LED’s are black-on-black.- Temperature does elevate a bit when charging a phone; I didn’t find it to be hot-to-the-touch.I charged my iPhone12 from less than 50% to 89% in just over a couple hours while I took a nap. The unit was down to about 50%.I then charged my iPhone 13 from under 75% to 99% in just over an hour before the unit gave out.UPDATE: As my iPhone 12 was largely unused, its battery discharged to near-zero. Therefore I took another opportunity to try out the charger’s capability. By itself (no external input) it charged the phone to approximately 60% in about 1.5 hours before the phone ceased charging due to temperature. I restarted it and it ultimately charged the phone to 96% before the charger died. I’d say not a bad performance and pretty good for price paid. That’s a little more of an extreme case than I’d ever expect to use, but probably the “worst-case”.

So I don't own an iPhone. I have a Pixel 9 Pro XL with a magsafe case. I use a magsafe charger every nice to charge my phone and it does so quite well. Can't say much about the speed of the charging. That I've never tested but it's ready when I want it so I don't care. I'd plug it in with a cable if I needed the fastest charging.This is the 4th magsafe battery pack that I've purchased. I had to return 1 because the qi charging wasn't working properly at all. The other 2 gave mixed results. Yes they all charged via qi charging and connected with the magsafe connection. The connections have been strong with all of the battery packs but with the other 2 packs, charging has been slow. One of them is the original qi and so that charges maybe 7.5w and up to 15w. The other is qi2 and should be a more solid 15w charging. But neither charged very quickly needing 30 minutes to go from 40-50%. And I mean just 10%, no more.The esr pack is the 1st pack that appears to charge fast. It claims to also have qi2 charging. I charged my phone last night to full and was actually very surprised when it topped off as fast as it did. I was around 85% and finished topping off with the esr qi charging to 100% in maybe around 40 minutes. The other pack took that long to go from 78-85%.I'm going to keep testing things out but as it stands right now, the esr is the winner of the 4 I've tried. Fast stable wireless charging from a battery pack.All of the packs claim 20v+ wired charging. I know the 1 I returned was fast. I'll have to check that out also but I'm confident that they're as fast as they claim.

Review by 30+ year Electrical Engineer, top licensed amateur radio operator. I purchased two of these batteries, one works normally, the other will not charge my iPhone 15 Pro. These is no way to perform a system reset on these batteries, so I am forced to discard it.There are numerous other options in this product category. Most are more expensive, but in all likelihood more reliable. I use this battery for adverse situations where compact, portable charging is critical. If this is your use case, I urge you to consider alternatives.On the photo shown, there are 4 charge level lights. There is one green light to indicate when the battery is charging my iPhone 15. In the photo it is off. With the battery that works the green light turns one when the battery is attached magnetically. For the non functioning battery it never turns on.

Good power battery. It looks durable and keeps charge really well. It is also small and can fit anywhere. It does take quite some time to charge it back to full.