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I've reviewed a number of portable battery chargers for mobile devices, but most of them were less than 10,000mAh. I was a bit unprepared for just how much capacity the 12,000mAh VoltSaf Power Bank has. In the last three days, I've been recharging (partial recharges) my Android phone, my wife's iPhone 4, and my Kindle Fire HD 7", and the Power Bank is showing one LED, meaning it still has at least 25% capacity remaining.
Even allowing for normal electrical losses, the VoltSaf 12000mAh charger has enough capacity to recharge most cellphones (typical batteries have 1400-2000mAh) 4-5 times, and small tablets (typical batteries have 4000-5000mAh) at least two times; with larger tablets, you would typically get at least one full recharge. The tradeoff for so much capacity is, of course, the size and weight of the charger. Weighing in at about 8½ ounces, this is no lightweight, but it's only 3-4 ounces more than some chargers with much less capacity, so it's not a bad tradeoff if you need the capacity and can't afford to lose power during an important phone call or video or GPS run. The two charging ports are labeled "2.1A" and "1.0A." Most mobile devices will charge satisfactorily from either port, although the 2.1A port will be faster. In any case, the maximum output current is a shared 3.1A (15 watts power).
The charger itself has a plastic (polycarbonate, I think) case that feels quite solid and durable. The corners are rounded, which should help prevent cracking if the case is accidentally dropped. Similar to many other portable battery chargers, there are four LED lights to indicate the charge status. There's almost a handy built-in LED flashlight.
The Power Bank may be a bit heavier than most people would want to carry around in a pocket, but it fits nicely in a backpack or any kind of carrying case. After using the charger for the last few days, I recommend it as an accessory for any mobile device that charges with a USB cable. (Note: one cable is included, with a Micro-USB plug that fits many mobile devices. If you need Apple/iOS plugs, you'll need to provide them yourself.) A 5V~1A wall charger is also included, a nice touch, since most portable battery chargers don't include this adapter.
I wouldn't usually mention the product packaging, but since the product description mentions a "beautiful, presentation-quality gift box," I'll say that the packaging is very suitable for gift-giving.
A product sample was provided by the seller for review purposes.
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