EC Technology Portable Charger 22400mAh Power Bank Ultra High Capacity 3 USB Chargring External Cell Phone Battery Pack with Auto IC and Flashlight for iPhone Android Phone Tablets

I have been using this power bank for over a year now (purchased July 2016) and it has been working great. Before you read my long review, I am going to give you the summary in case you prefer to keep things short and simple.Summary:If you are looking for a power bank that will allow you to power and charge any of your USB devices with power to spare, this would be a great power bank for you as long as you do not mind the larger footprint and the added weight (see below under the heading "Specs and Features"). In my travels through the airports I have seen many moms, dads and children gather around the airport's charging stations and be tethered to it with a wire. If you ever found yourself hooked on the airport's charging station or looking for an outlet, you will definitely love this high capacity power bank. On the other hand, if you are looking for a power bank that you need to carry around because you need to charge your phone once or twice during the day, this may not be for you and you should consider other power banks in the range of 5000 to 10000 mAh which may be less expensive and easier to carry around. The weight and size of this unit is the only reason I did not give it 5 stars but that may be unfair because if you need a lot of capacity you need space to store the batteries.Now, if you are still interested in this power bank, let me start by telling you that I took this with me on a trip to Europe where I realized that this thing has so much power, I did not need to charge it during the trip and had power left over when I got back (Of course, I was using regular phone chargers when possible). With this power bank I have charged my portable devices multiple times and also operated various devices such as USB cameras, Arduino microcontrollers, Raspbery Pi microcomputers, LED lights and anything that I work with that will power up or charge using a USB cable. Once I ran an Arduino for 2 days non stop collecting values from multiple sensors and it still had enough power left in it to run it for a couple days more.I own other power banks (such as the Tecson 10000mAh USB Battery Pack) that have "Smart USB ports" that will work for charging a phone or a tablet just fine but not for all other devices. For example when I plug a device that does not have a battery so it only needs USB power to operate, often times the "Smart Ports" will cut the power to the device as if I was charging a phone and it is now fully charged. This power bank does not have this problem.***Note: If you are not familiar with terms like Volts and Amps and you find some of the following information confusing, I attempt to explain these terms at the end of this review under the heading "Some technical stuff" so you may want to read that first.****Specs and Features:This power bank is very simple to operate with a single button and 4 blue led lights to indicate the power level. Hold the power button to turn power on/off or double press it to turn on the small LED flash light on it. Yet, you do not need to use the button because it turns off automatically when not in use. Here are some things you may want to know before you buy:* It weighs 474 grams (almost 1/2 a kilo) or about 1 pound. This may be a problem for your carry-on bag as many airlines have weight maximums on the carry-ons that can be 15 to 20 pounds and this may just be the thing that makes it overweight. Also note that airlines have restrictions on the battery capacity that go in your checked in luggage and you should make sure they allow 22400 mAh batteries to go in the belly of the plane if you are planning to put it in your suitcase. FAA also has a limit of 100 Wh per battery for carry-on bags and this power bank is 112Wh (5V x 22.4Ah) but they say that you can also carry batteries from 101 Wh up to 160 Wh provided that you have permission from the airline. Personally I was never asked to provide such information but it is something you should know and you should visit "faa . gov" for more details* It has a foot print of 6 x 3 inches and it is 3/4 of an inch thick. This may be quite large but the high capacity it offers needs space inside it.* It has 22.4 Ah (22400 mAh) capacity. This means that you can power a device that is rated (consumes) 1 Amp continuously for 22.4 hours. It also means that when you are charging it using a typical 2.1A charger, it will take over 10 hours to fully charge this power bank. To rationalize the amount of power this can store, consider that a typical laptop battery is 4400 mAh which is about 1/5 of the total capacity of this power bank. (Yet this power bank is not designed to charge a laptop so do not get any crazy ideas)* The ports are marked from left to right as "Phone", "Sumsung Tab" and "iPad". This marking is fairly dumb but if you read the label under the device you can consider the ports from left to right as "1 Amp ", "2 Amp" and "2.4 Amp" which is the maximum current a device can pull from the respective port.* Even if you turned it off, plugging a USB device in one of the ports, will automatically turn the power bank on and power your device.* It does not consume significant amount (if any) of energy when not in use as I have left it in a drawer once for a couple of months and found it fully charged.* It does not come with a charger so you will have to charge this power bank using your own wall charger. Typically, wall chargers for tablets have higher amperage capability than smart phone chargers. You should look at your wall charger's label to make sure that it is at least 2 Amps (Usually Amperes are noted by the capital letter "A" or the abbreviation "Amps") or more because charging this power bank with less than a 2 Amp would work but take a long time.* To charge the power bank, you will have to use the micro USB cable that comes in the box but it is about 1 foot long which means that when you plug it on your wall charger, you will most likely have to leave the power bank laying on the floor. But, this cable is nothing special so look around because you most likely have a longer micro USB cable laying around as they are very common.* It has an LED that you can use as a flashlight. In my opinion this is not a very useful feature because we all have cell phones these days that can act as flashlights but in case your phone is completely dead and you also need a flashlight, press the button twice rapidly to select from the following 3 functions: Light on low / Light on high / Flashing SOS Morse code*** Some technical stuff ***If you are not familiar with terms like Volts and Amps, you may want to know the following:- Amperes also noted as "A" or "Amp" or "Amps" is a unit with which we measure the amount of current a device requires in order to operate. You will also see the term "mA" or "mAmps" which means milliampere and one milliampere is equal to 0.001 of an Ampere- Volts which are usually noted by the letter "V" is a unit that measures voltage which is the potential differential between the + and - poles of a battery and you do not have to worry about it in this case because all USB devices and power sources are 5 Volts. Yet this is something you should know because it explains why you cannot charge your laptop with this power bank since laptop batteries operate at much higher voltage (There are ways to raise the voltage and charge a laptop via a lower voltage power source and there may be laptops that allow charging via USB but they are not common). You should also know that the higher the voltage that the load (devices you are charging) operates under, the less the Amps they draw from their power source (Here I am compelled to say "see Ohm's Law" but if you are the nerdy type that would want to see Ohm's Law, you are probably already familiar with it). If it helps, a good analogy for electrical current and voltage is if you consider water comming out of a faucet where the current is the volume of water and voltage is the pressure.- "Ah" means AmpHours and is a unit with which we measure battery capacity. If a battery has capacity of 1 Ah, it can provide power to a device that draws 1 Amp constantly for 1 hour before the battery is depleted. Many batteries are marked as "mAh" which simply means MilliAmpHours and 1 Ah is equal to 1000 mAh. So in this case, this power bank that is advertised as 22400 mAh is actually 22.4 Ah and that means that it can power a device that consumes 1 Amp for 22.4 hours continuously before it is depleted. For example, if your phone draws 1 Amp while charging and needs 3 hours to fully charge, you will be able to charge your phone with this power bank about 7 times before you need to charge the power bank again (22.4 Ah capacity divided by 3 hours of supplying 1 Amp per charging cycle).- Although wall chargers are power sources like batteries, wall charger capacity is marked in Amps instead of AmpHours because wall chargers can provide their rated Amperage indefinitely. Yet, they must be rated in Amps to show the maximum Amps that the Load (device you power up or charging) can draw from the wall charger. Contemporary wall chargers have current limiting circuits and will not allow devices to draw more Amps than they are rated for. This means that if your device needs 2 Amps to operate and the wall charger is rated for 1 Amp, your device will not power up. However, if you are just charging your device the wall charger will feed your device with its maximum rated Amps and you will slowly be able to charge your device. Older (prior to the smart phone popularity) wall chargers may not have current limiting circuits and if you try to plug in a device that needs to draw more Amps than the charger is rated, it will "burn" the wall charger. "Burn" does not necessarily mean fire but you may see the charger plastic melt and deform before it goes dead.- Wh means WattHours and it can be calculated by multiplying the rated voltage of the battery by the AmpHours (Ah) rating of the battery. In this case: 5V x 22.4Ah = 112Wh

I have had great success from EC Technology's batteries. Historically speaking, these backup batteries have had high performance, large capacity, and good features.I bought this specifically when I upgraded my 13000mAh battery. This product was so good I bought one for my wife as well. We travel a lot and spend a lot of time outdoors camping and traveling. Once again, this was an upgrade to these batteries. Note "upgrade", not replacement. The old ones work perfectly fine, but we wanted to go longer without a power source for charging. Our primary use was for camping off the grid, where I use my iPhone for many things such as power hungry apps such as navigation/GPS, photography, and photo editing. We also have a child that gets to play games or a movie on an old iPhone back in base camp.The best feature of this product is the capacity. You can get ~13 full charges on a fully depleted iPhone. It's pretty heavy compared to it's smaller counterparts with smaller capacities, but the fact I can go an easily a week without worrying about a power source is wonderful and liberating. Imagine traveling with 30 kids for a school field trip, going through airports, with multiple stops at many historical landmarks. Imagine needing to keep contact with these kids constantly on their phones. Imagine having to stop at a wall outlet to charge your phone. Not an option. Imagine going on an off the grid camping trip for a week. Using GPS and taking hundreds of photos and editing them on your smartphone at night. These are the luxuries these back up batteries provide.My last EC Tech model was made of a rubberized material that's "grippy", but not too grippy that it pulls fabric like silicone cases do. Unfortunately, this one is just hard matte plastic. It's easy to slide into a pocket or bag, but lacks the rubberized grip from it's predecessor. As noted, there seems to be a typo on the "Samsung" port. (Maybe that's why these things are on sale?) This cosmetic issue should a be a non-issue. The directions also state the same 5v/2.1A, so I don't know why they had to differentiate them by saying Samsung/iPad. Listing the 2.1A would have been sufficient and less confusing.A major feature is the auto-off feature. When the device is fully charged and no longer pulling power, the device turns off. This also prevents the battery from discharging accidentally if the power button is pressed while in storage. Previous batteries I've used have been emptied simply from being left in the "on" position and drained from it's own LED indicator. Not a very good thing when you're in desperate need for it.The batteries tend to hold a charge for a long time. I've gone up to 6 months without using it and the power indicator still remains "full". In my experience, after 4 months you'll see some type of drain. I have yet to see that characteristic from these batteries.I also want to mention about safety. We take for granted that our mobile devices are actually little computers. It is completely possible (but rare) when traveling that you can plug into a hacked power source. There are many different options to prevent a data breach by using specialized cords or dongles to block any data lines and just provide power, but having your own power source is more convenient and you know it's safe for your device. I would recommend this option for any Android user.Finally, let's just talk about convenience. I have mentioned that this battery is heavy, but you have to put that in perspective. Yes, it's heavier than most battery packs, but not really noticeable when in a purse (okay, maybe in a smaller purse), work bag, or backpack. I leave a fully charged one in my camera bag for my iPhone and camera accessories or in my day bag when I'm running around on the weekends. I also travel with one in my vehicle in the event something happens to my car (break down with no power), I know I'll have power or navigation to get me to safety. I never have to worry about getting to a power source...ever. After use, I normally top it off, but I can theoretically not have to deal with it for weeks in my bag (if not much longer). Also remember that this thing can power multiple devices at the same time. I can charge my wife's iPhone, my iPhone, and even my kid's while we're sitting down for lunch on a day trip.Whether you're camping, traveling, or need a safety back up (such as power outages), you can't go wrong with this product. I have no vested interest in this company, but have been very happy with the quality and design of their products. If you haven't already invested in a battery back up source, you really need to. I would recommend this product for price/value and performance.

This power bank is a bit heavy but could recharge my s8 4-5 times..