ROMOSS 40000mAh Power Bank, 18W PD&QC USB C Fast Charge Battery Pack, 3 Outputs and 2 Inputs External Battery Pack with LED Display for iPhone, iPad, Samsung, Pixel, Tablets and More

Pack is as solid as a brick, and as heavy. So for travel it's not ideal unless you don't mind the weight. Got mine today and have been running a USB light and fan off it for over 5 hours. The pack is still just over 80% charged. As I'm pulling 1.1A that is VERY close to the rated 40,000 mAh. Still plan on fully draining and placing it on the tester and will update with the results. But I expect it to take a little over the stated 40Ah. I plan on buying a few more of these as we have frequent power outages. For the capacity the price can't be beat.My only complaint is they do appear to be LiPo packs and not 18650 cells inside. LiPo packs tend to have a much shorter life, generally under 5 years. While 18560s can easily do 10 years. I do know their 10+ and 20+ are 18650 packs. So if product life is important get a few of those.Update.Tested it and my pack held 35,003mAh. So close enough to the claimed 40,000 for me. One oddity is I charged it to 100% and unplugged it at 11:00 am and went to work. By the time I got home at 8:00pm the pack read 70% charge. I plugged it back in to charge and it went back to 100% within 5 min. Small detail but strange. Perhaps after a few charge / discharge cycles it will correct itself. Still plan on buying a few of these. They are one of the largest battery banks you can buy and deliver the promised rating!

It's my fault because I didn't pay attention to how big (and I mean big) this thing is. I would say this is about the size of a masonry brick and just as heavy. I originally bought this to have a power pack on the go, but due to the size I find I don't use it like I wanted to.That being said, it definitely can hold a charge! I can get close to ten charges of my phone with this, and it does the fast charge.If the size doesn't matter, or you need something that can just last for a long time, I would recommend this. However I would personally get something closer to 15-20k mAh instead

Me encantó, excelente inversión, gran capacidad de carga...!!!

I used this battery pack in Ukraine during frontline defending and could not have been more pleased. With one charge, I could charge my iPhone 12pro (10) times, and my DJI air 2s Battery and controller enough for (8) Flights. It does take about (4) hours to charge but was very dependable.

The three photos depict charging a New Samsung phone using the type C port on the power bank. Showing 08% capacity remaining in bank, charging at 9.2 volts and 1.5 amps. Notice the blue symbol lit on display. This symbol means bank is charging at a high smart rate above the ordinary 5.2v rate of older devices. When connected to an IPAD PRO 11 this bank charges at 12.3 volts and 1.4 amps. I've exhausted bank several times, it's readings are spot on and display correctly whether charging or discharging. Bank will accept 12.3v up to 2.1 amps from a smart charging USB charger. Display of volts, amps and % capacity remaining are cycled with repeated presses of power button on bank. Whichever reading you prefer it will remain on the reading you last landed on. Default is % but you can control whether volts or amps remain constantly displayed. I am beyond satisfied with this amazing power bank. Enjoy ;)

I got a couple of my little nephews these battery packs for their devices for Christmas. They are kinda on the bigger, heavier side, but they hold a lotta juice and the price was great. They love them. They keep their iPads and whatever charged up. All that matters.

I bought this because my other batteries can't keep up with the current draw of my ipad 12.9 inch. This battery provides 18 watt PD charging output which can keep up, and the battery also accepts 18 watt PD charging from a PD wall charging socket. So it does what I need and is much better priced than other products I found. It also looks and feels very well made. I'm very pleased with this purchase and I've since bought another similar battery ... the 30000 mAh size of the same model. I prefer the 20000 to the 30000 because I don't really need the additional capacity and I find the larger size a bit unwieldy.

This thing is great. I have 3 screen heavy kids, and needed something that would power all devices on the long plane rides and drives. It takes a long time to charge but then again it makes sense because it will charge all my iPads at the same time a bunch of times and still have more energy to spare. I have a couple of smaller banks that simply hold the battery level of the iPads while the kids play but this device quickly charges it to full even while playing. Definitely would buy again but hoping I don’t need another. Not that it makes a big difference but it is a little heavier than I thought it would be.