MARBERO Mini Power Bank 10000mAh, 22.5W Fast Charging Small Portable Charger with PD 3.0 & QC 3.0,USB C Slim Lightweight iPhone Charger, Dual Output Compatible with iPhone, Samsung,Travel Must Haves

Small but powerful
The first thing I noticed was the mass. It’s dense and heavy for its size. It feels well built. First I charged this to 100%, via the digital readout on the built-in screen. A number flashed until it was charged, then went blank. There is one button on the device that indicates current charge.Now to see what it can do.1) It was connected to a small under-cabinet USB light that had completely discharged. After a couple of hours the light was charged, and the pack was at 91%.2) Another device was quickly connected to the pack, an average-sized bicycle headlamp. It took a few hours to charge, bringing the light to ~75% within a couple of hours leaving the pack itself at about 51%. I saw no way of disabling the charge % indicator of the pack while it is in use. It turns off when it is not providing or taking charge.3) Once the light was done, with the pack showing 45% charge, a small recording device with no charge was connected. That device brought it down to 41% in only an hour or so.4) Another small camera was connected, also drained. It brought the device down to 36% in under an hour.Each device connected appeared to have been fully charged. I tested most with other charging methods. The bike taillight indicated it was charging for about a minute or two; the others all lit up immediately as full. I wasn’t expecting this to go so far.I let it sit for a day or two after that, mostly to see how the pack would do idle. It remained at 36% but quickly dropped to 35 the moment something was plugged in.5) A smartphone with a weak battery was fully depleted and ready. That dropped it down only another 5% to 31. It’s hard to say how accurate the readout is, but it charged a lot of devices. Easily enough to feel comfortable with this and knowing it can handle some fairly common devices.6) My bicycle taillamp can go for days, but when it was dead, it was charged with this device. It didn’t draw much energy, bringing it down a few more percentage points. I finally charged it back up to 100% and made a spot for it in my pocket when needed.I did notice plugging devices into the ports can reset the electricity flow. I’m assuming some kind of safety feature is behind that. The phone screen lit up and continued charging, as did the unused flashlights and cams, but otherwise appeared unchanged. The desk lamp, however, needed to be re-plugged for it to function. That could be annoying. Better safe than sorry is what I’m going with.I let it sit for a day or two after that until devices needed more charge.Pros:*Compact and powerful. Extremely easy to use.*Charges USB devices. Both types A and C.*With a USB hub connected, it charges numerous devices.Cons:*Plugging in a power-drawing device reset the outputs. Not often a problem for me, but being in the dark for a moment when replugging in the connected desk lamp was disconcerting. It typically has a little LED to make it easy to find that didn’t reset like the other devices.Potential Con:*Doesn’t appear to take charge at all when discharging. I had a small device with the unit plugged into a 20W charger. More than enough to give the device charge while simultaneously charging the other device. It quickly charged up once the other device was charged.A lovely device. Easy five stars for this. It took a while to arrive! It was worth the wait. It’s a hefty little device; I’m surprised by the weight. It has already hit the floor once (oops), from a height of about three feet, but appears to be ok. It does take smudges and fingerprints quite easily with the glossy black case. I’m not sure black is the ideal color for leaving in a car or somewhere the light-absorbing color would add to internal heat, but at least it looks good. I didn’t notice it get warm to the touch. My phones and some other devices do as they charge.This review is getting too long.Final thoughts: This would make a great little gift for someone who finds themself without power to their lights, camera, phone, or whatever. Especially when it counts. It packs a lot of power for something about the size of a deck of playing cards. Recommended

This is a lifesaver!
This is one powerful power bank! I do not leave home without it anymore because I use my phone quite frequently for my jobs so my battery is always running low and this power bank has saved me many times! It charges my phone up completely within about 30 minutes, no joke! I cannot recommend this power bank more! It’s small, easily fits in your purse or bag, it’s not very heavy whatsoever, and has a nice sleek design. It does however take a minute to charge up completely so make sure you put it on the charger before you go to bed so that is charged to 100%, but other than that I highly recommend this and it’s totally worth the money!!