Portable Magnetic Wireless Power Bank 5000mAh imuto 15W Wireless Portable Charger Compatible with iPhone 13/13pro/13Pro Max/12/12 Pro/12 Pro Max/11/XR, iPad Pro, MacBook 12"/Air

I used an inline logging multimeter to verify the specs listed. They all ring true. There is a current limiting feature for charging dead batteries built into this battery pack, and it works great (description below). I consider this an excellent feature, that should be advertised better. The interface is dead simple - clear instructions are included in the nice packaging, but are wholly unnecessary because it's so intuitive.I bought this to use with my laptop, a Lenovo ThinkPad t440s with an aftermarket USB-C cable. The stock charger is rated at 45W (20V, 2.25A). Even at 100% load, this battery pack delivers all the power my laptop could ask for (about 42W @ 20V). I only tested at 100% load for one hour, but I don't doubt it could keep going indefinitely.When I first tested the charger, my laptop battery was at 1%. This created a very large current demand, and the battery pack responded by limiting itself to about 35W @ 12V measured. This allows a completely dead battery to trickle-charge for the first few minutes, which is both safer and better for both batteries' longevity. My laptop's charge controller accepted this lower voltage and continued charging without issue, albeit at a slower rate. About 10 minutes later, the output was back up to 45W @ 20V. At no point did my laptop find it necessary to power-down.When charged with a capable USB-C PD source, the battery pack sinks 43W @ 20V. It appears to negotiate with the source for the highest voltage available (20V is the limit of the Power Delivery spec). If you have a "lesser" charger (9V, 12V, or a lower power rating), it should still make use of its full capability.I completely charged and discharged the battery pack through a logging multimeter. 72WHr were discharged, and 122 WHr were used in charging. Assuming the meter itself dissipates negligible power, I'd estimate the capacity of this pack to be the average of those numbers - 97WHr, a rounding error from the advertised number. Manufactured with integrity, and with efficient components and design.During heavy use, it gets slightly warm. There is a hollow layer built into the case so that the external temperature is cooler than a mug of coffee, with not hot-spots. It is nice to have, even though it makes it a couple millimeters thicker than other battery packs. Because of that feature I would feel comfortable using this pack in a confined space (like a backpack pocket).Overall, this battery pack is surprisingly high quality in design and construction, considering that it's the lowest-cost of similar products on Amazon as of 24 Aug 21. If you are reading this, I haven't updated my review based on long-term issues since then.

Overall, the battery performed well and costs less than $40. I tested it can charge both ways at 44watts which is great. It said to support 45watt of charging and discharging, and that is the reason for me to purchase it. I cycle my battery on daily basis, and won’t stay in a hotel room for too long, so the maximum time I can wait is 8 hours given the power goes out when you leave the door.The catch is that this battery uses lithium polymer instead of lithium-ion technology, so it weighs almost 50 percent more. Although Wikipedia says it is safer than a lithium-ion battery.

UPDATE: Ordered replacement, new one works fine. Seems like a pretty easy QA issue given it failed out of the box. 5 star product, minus one because hassle. Needed it to power a power hungry audio device on the go, works great.I got it, I dont have a type C to C charger so I used my Nintendo Switch charger and it just flashes 188 and wont stop even if I disconnect it. None of the manuals explain why this is happening. Might bump my rating if leaving it on the charger actually works, but otherwise a note in the manual would be nice

This was an inexpensively-priced item but unfortunately I couldn't figure out how to get it to work. First I had to call Amazon service to find out that you need to have the device 100% charged to use. Starting from 14% charged out of the box, that took 12 hours to get to 100%. Then I went to use it & finally got it to start charging my laptop, but when I started to use the laptop with the battery charging the computer, it appeared to shut-off the laptop charger. At that point I figured, what's the use? This all may be on me, but that's my experience. I was disappointed that, whereas the laptop computer icon changes to indicate when the laptop is connected to electric power, when I used this charger there was no such indication.

Charges devices way faster than an outlet. The wireless charging isn’t the best with headphones and anything that’s not a phone but other than that this thing is awesome.

Bought this to charge my new M1 16" MacBook Pro while traveling. Planning to go on some trips and wanted to make sure I don't get stranded. It is smaller than I was expecting which I'm so happy about. Comes with an awesome little bag/case which I didn't know and was a happy surprise. It supports Fast Charging on my phone (Samsung Fold 3 that can handle 25W), charges ipad Pro 12.9 and new MacBook Pro with no issues. Got it on a whim from a YouTube video. So happy I bought this!

So I use my surface pro 8 and this battery will allow me to run navigation software for 48 hours before I have to plug it in. So I have another battery from a USA brand and this battery out performs it by almost a day. Great battery for high powered devices. I'll be buying another one soon to replace my friends battery for Christmas.

The power bank was just as described. It charged very quickly few minutes over an hour and it was fully charged from 0 to 100 %. The build quality feels sturdy and very compact design I managed to fit my portable 100watt certified charger with the included bag for power bank.