TruePower iV Pro iPhone 4 Battery- Fits iPhone 4, 3G, 3GS

TruePower offers a bulky (3100 mAh) backpack battery that fits the iphone 4…I’m curious how well it fits since the same pack also fits the 3G/S.  This is the biggest battery (3100 mAh) we’ve seen in this “backpack” style battery.  This big guy also has a LED light on the back, a power button, a USB port for charging many other devices and comes with a mini USB cable to charge it.  It’s $72 right now

• Made in American and Apple approved the iV Pro works with iPhone 4 and 3GS
• Built-in USB port will charge a second device such as an iPod and earpiece or connect an additional USB device like a printer, mouse or digital camera
• Powerful built in light for taking pictures or finding car keys in low-light conditions