There are plenty of high-capacity battery chargers out there, but few as versatile as the MyCharge Peak 6000.
As its name implies, the rechargeable battery inside the unit is rated at 6,000mAh. That's around double -- or even triple -- the capacity of smaller, more pocket-friendly chargers, and the Peak 6000 is pretty beefy, weighing in at 8.5 ounces. While that size is a bit of a negative, the big positive here is the various connectors built into the unit as well as the option to recharge the Peak 6000 by simply plugging it into the wall. Along with an integrated Apple connector, there are a Micro-USB connector and a USB port for attaching any charging cable.
It's worth noting that the Apple connector is a bit wider than the official Apple connector that now ships with Apple portable devices. I had a little difficulty getting the connector into an iPhone that had a rugged case on it (the LifeProof case), but it should work with most cases (I just can't guarantee it will work with all of them).
You can charge up to three devices at once. For instance, I had an iPhone and a Bluetooth speaker hooked up to the battery at the same time. You can also charge an iPad and other tablets.
As I said, you can recharge this portable battery by simply flipping out the prongs on the bottom of the device and plugging them into the wall. The other recharging option is hooking the integrated USB connector up to the USB port on your computer.
As an added bonus, the Peak 6000 also talks to you, thanks to a built-in speaker. A female voice tells you that the unit is charging when you plug it into the wall. The voice also announces when you're charging a device. And finally, when you press the button to see how much battery power remains, it'll let you know just how full it is (the four LED lights will also tell you).
This type of bigger portable battery is meant to sit in a laptop bag and have around in case you need to juice up the various portable devices in your arsenal -- though, alas, it doesn't charge laptops. Smaller devices like the iPhone it will charge pretty quickly, while the iPad takes significantly longer. While it can almost fully charge an iPad 2, it will only get you to 50 percent on a new iPad (third-generation).