3GJUICE "Shameless" 8200 mAh Rechargeable Battery for Ipad, Iphone, Itouch, Android, Samsung, Ninten

• one of the strongest batteries in the world
• delivers 8200 mAh of raw power
• can charge any USB-device from iPad, Nexus 7 to iPhone or Galaxy S2
• charges handheld game devices like Nintendo (all!) or Playstation
• works great with Kindle too

For me the 3GJuice Shameless 8200 replaces my 3GJuice Major Mojo, one of the earlier high capacity and user friendly back-up batteries which I've used for the past few years. I use an iPhone 4 with multiple apps constantly running, as well as lots of internet activity for personal and professional activities. I am a physician and work extended medical and hospital shifts (often in excess of 24-36 hrs)and deploy on occasion with a disaster medical assistance team to areas where infrastructure is affected and access to electricity is limited. Like everyone else on my disaster med team, I am a gear junky and am always looking for the the best performance and utility in gear.

This battery has a beautiful form factor and is just slightly larger than an iPhone, easily fitting into my pocket while charging my phone on the run. The hard power switch and lack of the accessory led light are improvements that prevent accidental battery discharge. The charging/capacity lights are beautiful. The versatility is awesome, with a single USB that handles both 1 amp devices (iPhone) and 2.1 amp devices (iPad), as well as a DC out that charges 12 volt devices, like netbooks. Every possible charging tip you could possibly imagine is included. It charges by a proprietary AC adapter that charges at 9 volts. It does not charge by USB. Batteries that charge by USB, even when plugged into a USB wall charger cannot handle the same voltage so they charge more slowly. This unit recharges much faster than anything with an equivalent or even lesser capacity. I have a 6600 mAh device that charges only by USB and takes almost twice as long to charge when charging through a USB wall charger.

To know how much I can depend on the battery I have tested it by using my iPhone 4 to the "red zone" on the battery indicator and then recharged to 100% timing as it charged. The battery recharged my phone 5 complete times and to 60% on the 6th round. I checked charge status in 15 min. increments and it consistently charged 30% in the first 15 minutes; 50% after 30 minutes; 75% after 45 minutes, 90% at 1 hr and 100% 1:15-1:30. This is much more efficient than any of the other extended batteries that I have used.

Bottom line: This is a beautiful, functional and very efficient external battery that is perfect for folks with smart phones, portable game units, tablets and netbooks. Whether you're a power user or just want peace of mind while traveling or during power outages or a true disaster where you might night have access to electricity for a time, this unit is the right combination of power, function and utility. The only thing I would add, would be a simple protective case to preserve it's elegant look.