Portable Charger, 12000mAh Long Lasting Power Bank for Heated Vest/Jacket, External Battery Packs Dual 5V/2.4A USB Ports with LCD Display, Battery Backup for iPhone iPad Samsung Galaxy Nintendo Switch

I have been using 3 of these power banks several times monthly for 2 years.PRO: Yield power as promised. Output power fast. Re-charge fast, especially on USB C. Didn’t lose power with aging over this 2-year time period. Gives you a choice of inputs: USB Micro or USB C. Output is on standard USB A. Indicates power in the bank with a continuous scale, not just 4 dots. Doesn’t get hot.CON: Not as easy to carry as you might expect. Inside the case It’s a dense little brick of metal about an inch thick. When tossed into a backpack or large handbag it goes straight to the bottom. And it quickly wears its way through the bottom of an ordinary fabric pocket. So if you need to have it available for easy use alongside your cell phone you need something like a handbag/backpack with leather or tough nylon pockets or a military pouch.NOTE: This product may have improved in 2 years.

Great little size charging is pretty fast

I grabbed one of these because my wife's old iPhone 5c battery was constantly going dead. Yes, we could have upgraded and gotten a new phone for $1000+, but after asking her if she wanted a new phone (obviously yes with some caveats), we decided to try a power bank first to see if that could get her by for a bit. 2 problems: first was the power bank didn't recognize her phone and would only charge if the phone screen was on. This is fine if you are sitting around and can leave your phone on and stationary (or if you are using your phone). However, if you just want to keep the battery topped off with the screen off (most people I presume), this wouldn't work. The seller did send a replacement thinking it was defective (it was not unfortunately), so we are stuck with the device.The second problem is the lack of small charge cables. To keep this as a unit with your phone, you need your phone, a charge cable, and this pack. If you plan to charge the pack, then you need a mini USB cable as well. It's a lot of stuff to carry, and because most charge cables are at least 1 foot long, you end up having a ton of extra cable to span the 1-2" gap actually needed. I'm sure there are appropriately sized cables for this exact purpose, but they probably aren't cheap.The pack itself works fine. It'll charge my Galaxy S5 with the screen off, but I seldom need it. I read online it has something to do with the resistance of the device, with older phones not having as much so the bank does not recognize it as needing charge. Whatever the case, it didn't work for my wife's phone. She still uses it and has to manually turn it on every time she uses her phone, otherwise her phone battery might cut out and die. If anyone has ideas of how to keep the pack charging even with an older phone, feel free to comment and let me know.

I wanted a small charger, but could hold a big charge, and this fits the bill. It really is about the size of a credit card, except fat like a stack of a dozen or so cards. Follow the directions, charge and discharge it three times when you first get it so that the indicator light properly can tell you how fully charged it is. It charges things pretty quickly, so I ran it down by recharging my M1 MacBook Air (USB-C), an iPad and my iPhone. The product description is a little confusing... this has regular old USB-A type charging outputs (two of them) and two inputs for charging it back up (micro-USB and USB-C). I've used both approaches to charging it, both work fine. I got a couple of the USB cables that have three-headed outputs (so, USB-A to plug into this thing, and USB-C, Lightning, and micro-USB for output charging) and it works great using any of them. And also both outputs work at once (I hadn't tried it, but just did, with two iPhones on two output cables). They've each gone up about 4% points in charge in a couple of minutes, and the charger has dropped from 100 to 98. And all at a decent price. Everything I wanted.

Is not close to12000mah. I would estimate it is 6000-8000mah based on only 1 and 3/4 recharges of my device. Overall, it works well, very simple and not much to go wrong.

I just purchased a new heated vest and I needed a portable battery to use to power my vest during soccer season. This charger is great. It arrived already charged over 75% and took no time at all to charge completely. I love that it has two USB ports, one for my vest, but also one for my phone. The display is great and very helpful to know how long I have before I need to charge it again. It's also one of the lightest of the several portable chargers that I have. Absolutely great product.

No idea why this item is so highly rated. My phone was at 60% and took over 1.5 hours to charge. I used multiple cords to see it that was the issue.I use my phone to scan for work and need a fast recharge to stay productive. For a fast recharge while out and about, it just doesn't cut it. If you want to use over night to charge that may work better, but you'd have to be in a cabin in the middle of no where for the convenience factor to kick in... otherwise just plug your phone in. Maybe I got a bad one? IDK... but it's being returned.

High quality battery bank with great choice of materials and complete detailed instructions including the initial conditioning of the battery. The Display is on while charging devices, and it is bright white LED display. It can be interrupted from charging by double tap on the button switch. The included instructions suggest an initial full charge then three discharge/charge cycles to prepare the battery bank and calibrate the display. I fully charged to 100% and when the display stops blinking, then plugged in two Goal Zero Luna LED Stick Lights (1 watt each) for 5 hours until I used the battery bank to charge my Toshiba 10.1" Tablet from one of the two USB-A outlets. With one if the Goal Zero Lights still attached, It took an hour to charge the Tablet from 62% to 95%, when I unplugged the tablet to stream a movie that we cast to the Fire Stick. I left the Goal Zero light plugged in 6 hours later charged my Galaxy S7 Edge phone from 60% to 100% before the Battery Bank was drained. It's charging now.