Simple, compact, durable charger
921940
I purchased this as battery backup to recharge my family's phones when we take road trips. It's capable of charging two phones simultaneously and quickly. It's also been useful for keeping a Bluetooth speaker charged. I often carry it with me on long bike rides, and it has held up well during heavy use this past summer. As far as I can tell, the unit contains four rechargeable AA batteries and a circuit board. Simple design that works well.
4737619
I've owned this charger for several years now and have recently order another one.  It has been faithfully charging a variety of devices without a problem.  This is why I've bought another to use with another device.
1682800
The Yubi Power YP250A USB Power Bank is a very compact, convenient to use, portable battery powered charging unit.  The dimensions are 3.7" long, by 0.85" square.  On one end of the unit, there is a USB port for output, and a mini-USB port, for recharging the battery bank.  Utilizing lithium ion batteries, the capacity of the device is 1500 mAh, with the standard output of 5 volts DC.  The YP250A is extremely easy to use, you turn it on, and then simply connect your USB powered device to it.

Controls consists of a power button, above which is a small silver colored bar, with red, blue, and green, LED indicator lights behind it.  When the unit is turned on, the blue LED coming on, indicates that power is available.  If the red LED comes on, the battery bank needs to be recharged.  When charging an external device, the blue light remains on until your device is fully charged.  After this, the blue LED turns off, and the green LED comes on.

A 9" long USB cord is provided for recharging the power bank, and can also be used for charging a device utilizing a mini-USB input.  When the battery bank is being recharged, the red LED stays on, until the batteries are fully charged, after which the green LED turns on.  A second accessory, is a carrying pouch.

Except for instructions printed on the back of the box, there is no documentation provided with the unit.  There is also a warning that when carried in a pocket or purse, the contacts of the USB ports, can accidentally be shorted out, by contact with metal objects.  Should the device fair to work, recharging is recommended to restore the unit to proper operation.

The YP250A is available in red, blue, silver, and black.  The unpainted brushed metal housing, appears that it might be easily marred, by incidental contact with other objects.  The provided pouch is rather large, but using it might be a good idea, as it would help prevent accidental shorts, and also protect the finish.

This product was provided to me for review purposes.  The best features are the compact size, simplicity of use, fairly quick recharge time, and relatively low cost.  Power capacity is adequate for those times when you need a little extra power, or on a short trip.  Just remember to bring any USB cords you will need.  I'm not sure how it would affect costs, but my suggestions to the folks at Yubi would be to go with a nice smooth painted enamel finish, add some brighter colors, and reduce the size of the pouch a bit.
1264125
This charger is good quality. Because it is durable, it stays on a top table very well. The chargers I have plugged into this unit have charged quickly. It's very reliable.
28870
Finally there is a charger that is compact as well as dependable.  This one small "box" plugs into 110 vac (house power) and when not using, the plug is folded neatly away.  For those world travelers there is a plug adapter.  On the go and need a charge?  Yep. There is an accessory plug with a cord that one end plugs into the auto and the other end into the charger.  Another well designed is the place to snap in your battery for charging while you click away with the power from the second battery supplied.  There's even a visual indicator that the battery is being charged.
This product fits in my camera case with no problem for easy use at home or on the go.
My only problem is this great charger doesn't make my photos for me.  But then it wouldn't be as much fun then.
1381169
Clean, simple, and does the job well. I've had no issues with this product. I use it mostly to charge my phone, a Google Pixel. And it charges it quick and reliably.
929640
This little charger has come in handy in a pinch. It's small size makes it easy to carry. Just enough to get a device working for a bit until you're need an electrical outlet. Works great.
1247090
This charger is just like every external charger. It charges my phone fairly quickly which makes me think that it has a 3A port. I keep it on my keychain with this little guy: http://www.amazon.com/gp/product/B00E9B8V5M/ref=oh_details_o04_s00_i00?ie=UTF8&psc=1 and I never have to worry about losing power anywhere. It is a little smaller length wise than an iphone but it doesn't feel that bad on my keys in my pocket. Keeping the cap on my keyring means I can just leave the charger at home when I know I won't need it without having to fiddle with key rings all the time to get it back on and off. It's got some weight to it which makes it feel durable and I don't have to worry about it breaking in my pocket or even dropping it. Feels like one of those mini maglites. I charge it after I use it (often) and have not used it up completely since I usually keep it fully charged.
1428552
Small, lightweight charger that packs quite some power. Quick charge comes very handy in those moments when you are out and need the phone to get directions but the battery is down to 5%...I've used it regularly for two years now, and on many different devices such as phones, tablets, portable fans, portable speakers, etc. Still holds its charge perfectly, works as well as my OEM outlet fast charger for my phone.
4000444
I have accumulated lots of portable electronics devices, and having separate chargers for all of them is a logistical mess, so I decided to replace the multiple chargers with one charger to rule them all. I've been using this since July, 2015 with no issues. I use it to charge my iPad, iPhone, Kindle, and to power the occasional raspberry pi projects. The prongs that go into the AC outlet can be flipped down for travel if you needed to travel with this, although I think for travel I would bring a smaller single-device charger. There is a LED that's always on, which isn't particularly a problem in my office, but could be a distraction if you wanted to use this in a bedroom while you're trying to sleep. Sticking a piece of tape over the light would probably block it sufficiently.

I have on occasion used all four ports simultaneously without the unit getting excessively hot and without any reliability issues. For something so cheap, it seems to be a quality charger, and has been serving me well.
4180286
Small, handy, and durable.  This is now my go to charger  ~ you have to keep in mind that the cord is short, but it's perfect for traveling or for a direct connect to your computer.  I use mine on my desk ~ and this one is going to be my go to for when I travel.  I am going to put one in my car as well  ~~ they are made to twist and turn and bend, so they take much more wear than your average charger.  The actual function is no different than if you buy a Amazon charger, but the cord itself is worth the extra $$.  LOVE it! The pink just POPs on my desk!
2279744
I got my New Trent iCarrier IMP120D over a week ago and so far it has been great. Its capacity is good enough to charge an iPhone for about 9 times, it comes in a reasonable size and weight. One can charge two devices at the same time and the charging time, at least the first few cycles, is faster than regular USB chargers. The design is durable and compact. I wish it would come with a multi purpose cable.
1920352
purchased the 2-pack, one for me and one for another person.

i can't be more pleased! i've had other similar (but lesser powered) car chargers before that fell apart quickly, had difficulty inserting or removing, or just plain and very cheap in quality.

these are very compact, and their build is solid for the price with good design to boot. they feature a small LED to let you know it's connected to a powered cigarette lighter's port, but isn't so bright that it illuminates the vehicle's cabin. and these are easy to insert and remove, without horrid friction issues that i've experienced with other brands.

along with the security of 4-layer protection, i feel comfortable plugging in my valued mobile devices into this when they need charging.
926397
A compact, solid-feeling powerbank with a rubberized exterior and a decent capacity. It's nice looking and has a better charge/discharge rate than many early-generation battery packs.

99Digitals has gone for simplicity in this USB battery pack: a minimalist design, one output that delivers the battery's maximum output, a 4 LED capacity gauge. A short, flat USB to microUSB cable is included. There's an easily overlooked low-lumen "flashlight" LED that's too dim to be useful, and a power button.

Charge and discharge are both decent, with the battery drawing 5-6W (at the wall) when charging. Charging a connected device is brisk, with my LG Nexus 5 topping up as fast as it does from its native AC adapter. This is better performance than many USB batteries I've tried, and superior to many USB hubs. Even allowing for power lost to overhead, the 7800mAh capacity is enough for 2-3 full charges of the typical smartphone's 1800-2300mAh battery.

The no-skid ribbed exterior is a nice aesthetic variation from the usual battery, but the matte black finish keeps the rubber from looking cheap.

[ A free sample was provided to me for review. ]

In today's mobile-centric world, it's important to keep devices charged up. But depending on wall-power or car adapters can mean a lot of plugging-and-unplugging-- short charges that are bad for battery longevity, and ineffective at keeping a good charge (unless you're willing to be tethered to the wall for an extended time). With a USB powerbank, you can just take the power source with you, unplugging when the device is done charging up. I keep a USB battery in my vehicle, office desk, and in all of my commonly used travel bags.

The market for USB battery packs has become quite saturated. But this unit, with its compact minimalism and solid power performance stands out. Recommended.
4541688
I use this to recharge a bank of 2 - 145 amp hour batteries wired in parallel and it does the job just fine.
Unlike a normal user, I use this charger almost everyday for my business.

Pros:
1. Lightweight and includes a small handle on top.
2. Easy to use.
3. Fast charging
4. Durable: I have practically thrown this thing across the room and its still working.

Cons:
1. Only comes with alligator clips (not a big issue if you know simple wiring skills)
734496
This charger was great (so great in fact that someone stole it)  It is very convenient with its two ports and built-in charger, which allows for a seamless three-way charging station.  It is also very compact so you can put it right into your pocket or purse and take it anywhere you want.  The built-in charger wraps around the charger to prevent tangles, but if you have very short nails getting the edge of the charger out is a bit difficult.  One of the reasons I didn't give it a five star was that the built-in charger is pretty short and makes for some awkward phone placements.  Another reason is that when you put the charger in the outlet,  the actual act of putting in the charger is a bit resistant at first, and that when it is resting in the outlet it almost seems like the weight is a bit much for the prongs (I think they are called prongs, google brought no relevant results) as the charger sits out a smidgen and is angled downward.  Other than those two nuances the charger is great and I would definitely recommend buying it.
2252441
This is an excellent charger - very compact, intuitive menu system, solid. Hold quality.

I have it hooked up to a power supply from my 3D printer, which only provides 200W, so I am selling myself a bit short with this setup, but it works great nonetheless.

The charger accurately ascertains the output of my power supply, and auto-detects the cell count of the LiPo batteries I've charged with it. The only thing to do is set the battery capacity prior to charging.

It has tons of memory slots available as well, but it's so easy/quick to set the charge output, I haven't bothered with storing any settings (yet).

Overall, an excellent charger and an even greater value - highly recommended.