TSST SAMSUNG SDI Polymer battery cell Portable 5,000mAh External Battery Power Bank Charger for Samsung Galaxy, iPhone, iPad, HTC, and More (Silver), Ultra high charging speed 2.4A Max

compact, phone-sized charging unit with higher-than normal capacity and dual amperage USB ports (many tablets or other devices need more power to recharge)takes about 7 hours to recharge this battery cellthe digital readout is handy, but could have just used red/yellow/green led schema too...voltage on the USB ports only seems active when a device is attached or digital readout button is pressedDO NOT THINK ABOUT USING THE USB IN SERIES!!! common conductors for the ports are used and the unit *will* shut down (albeit non-destructively, which is a bonus)i'd be wary about claims of recharge times, btw - and remember, if you're going to put this in long-term storage, deplete the battery to 60 percent (Li-ions are happier that way)only a one-year warranty

Love the numeric indicator, the power holding ability. Great and sleek design, at this age and time, I would assume it's the smallest we can get for the size and power. Do note that the actual charge this powerbank can hold is lesser than specified, but this is one of the better power banks I've used that is more power efficient.

Best powerbank I've ever used. Charges really fast, not that heavy to carry around and has two usb ports to charge two devices. Used it for 3 years without any problems. Shame that I've lost it though.

No functional issues so far, although it does scratch easily.

Excellent product and quickly charger.excellent design and material

This handy cellphone-sized (roughly the size of an iPhone 5) cell doesn't take up much room and is holds enough juice to give your device a recharge when you're away from a wall charger or other power source.It has two USB ports. I plugged an iPad Air and an iPad Mini into the 5000 mAh charger. It went from a 100% charge to 6% in about an hour and a half and increased the iPad Air's charge by 30% and the iPad Mini's by almost 40%, which is a bit more than the specs claim. Then I recharged the charger (with the included USB-micro cable) to 100% and popped two ipod Touch 5 into it, each of which was below 20%. In about 70 minutes it had charged both iPods to 100% and still had 49% power left. With the remaining charge I recharged a single iPod Touch 5 in about 70 minutes to 100% and still had 16% remaining on the charger.This would be very convenient to have on a trip when you're using interactive maps and audio tours and taking photos and using up the power quickly. Until they start equipping cellphones and other devices with replaceable batteries so you can carry a spare and switch it out on the spot, this portable charger is the next best thing.

This product is perfect to carry along when going out to any activity such as concerts, parks, parties, etc. How many times have we faced the situation where our devices end up running out of juice after constant use (selfies, texting, facebook/Instagram posts, etc.) during events or outings? This battery cell is a portable phone charger that gives your batteries a few additional hours of life in a hurry. The battery cell is the size of a smart phone, which basically means that you are carrying an extra cell phone with you; it includes two output USB ports to recharge up to two phones at a time, and a mini USB input port to recharge the actual battery cell. There's also a digital display that shows the amount of charge remaining on the battery cell at the press of a button (the display will start flashing as it reaches 5% or less of battery charge left).Specs: The cell capacity is documented at 10,000 mAh @3.8V but charging capacity is only 5,920 mAh @ 5vTests:Samsung Galaxy S5 with factory battery (2800mAh) at 19% charge - idle phone, powered onSamsung Galaxy S5 with 3rd party Anker extended battery (7500mAh) at 27% charge - idle phone, powered onI started charging the phone with the extended battery first and then after 2 hours 45 minutes I plugged the other phone. The phone with the extended battery recharged to 100% in 3 hours. A while later the battery cell ran out, leaving the other phone at 85%. Not bad at all, considering the capacity of both batteries together. This battery cell would have taken two regular Samsung phone batteries with ease, leaving room to spare.The battery cell itself took 5 hours to recharge to 100% capacity, using my actual Samsung phone wall adapter as the power source. At 20% capacity per hour, an overnight charging is recommended for a full recharge.This is one product you shouldn't leave without, especially if you are a very active phone user.