Cubedge's EDGE.sound is a terrific new unit that is well positioned to meet this need head on. It's a beautifully designed, compact, yet substantial Bluetooth stereo unit that delivers 95dB and 10 hours of battery life. You can also connect any audio source using the included standard audio cable. And because it uses Bluetooth and has a built in microphone, you can use it as a conference room speakerphone!
If ten hours isn't enough, they actually offer a solar panel add on option that extends your battery life indefinitely. The unit is nicely finished with aluminum and silicone rubber and is available in black, white or silver.
I really like the heft and design of the EDGE.sound and the fact that you can add a solar power option is a real plus. You don't have to wait for Lightning dock connector boom boxes to enjoy stereo sound from your iPhone 5, or any Bluetooth device for that matter.