• Compatibility: iPod nano 1G, 2G, 3G; iPod classic 4G, 5G, 5.5G, 6G; iPod touch; iPhone
• Power and charge your iPhone or iPod--extends play time up to 30 hours of music or 6 hours of video (on iPod nano 3G) or 3 hours of talk (on iPhone)
• Includes retractable USB charging cable
• High-capacity, rechargeable Lithium-Ion polymer battery pack for increased energy efficiency
• Small enough to keep connected to your iPhone or iPod

The rechargeable Kensington Mini Battery Pack and Charger for iPhone and iPod has the power you need to keep the conversations and music going.

Keep on talking, keep on rocking--the rechargeable Kensington Mini Battery Pack and Charger for iPhone and iPod has the power you need to keep the conversations and music going.

Keep on talking, keep on rocking.

Power and charge your iPhone or iPod on-the-go, and enjoy an extended playtime of up to 30 hours of music; 6 hours of video; or 3 hours of talk. The high-capacity, rechargeable Lithium-Ion Polymer battery pack is small and unobtrusive enough to keep connected to your iPhone or iPod while you're using it.

The LED battery meter lets you visualize how much juice you have left, and the included retractable USB charging cable makes powering up the battery pack a snap. Backed by Kensington's 1-year warranty.

What's in the Box
Kensington Mini Battery Extender and Charger for iPhone and iPod (Black), USB charging cable

This was a great battery back up for my iphone. I used my iphone for an entire day, email, maps, GPS, taking photos & showing photos, playing games ect. I could use my phone all day because it was like having 1 extra battery charge with me at all times. Mine doesn't really do more than one charge and then it's pretty much dead. I picked mine up on sale for $28.99 over the holidays. If you wanna use your iphone alot or while you're traveling or on the go - you need this for sure. 1/6/2009 (PS - I don't work for apple or Kensington)

I purchased three of these, opened one, used it for about 2 weeks seemed to work on my iphone 3g. Charged the phone up in about 40 minutes.

CONS:
1) after 2 weeks, nothing at all, no charge even if i left this thing charging all night, it would not even charge or be recognized by the iphone.. weird
2) uses a usb to mini-usb to connect to it's power source then iphone connector to connect to the phone, DOES NOT ALLOW YOU TO SYNC OR ANY OTHER FUNCTION OF THE DOC CONNECTOR.

net net, i returned all three.. amazon was great about it all.. and will look for one that does support doc connector pass through and last longer then 2 weeks without having issues.

I too should have read the other reviews more closely before buying this product. The one I received last week DOES work with firmware version 2.2. However, one cannot use earphones when it is plugged in. It would be good for an iPhone as an emergency recharger as one could continue to use the phone while it is recharging. I had planned to use this battery when I could not plug in my iPod Touch for an extended period of time. If I cannot listen while it is recharging it defeats the purpose for me, because by the time it is recharged I will be able to plug it back in.
I just ordered one of these....

http://www.thecesreport.com/audio_11041861_B001KX9D2W_MOBILE-SPARK-3G-POWER-PACK-5000mAH.html

Hopefully, this will be better for my application.

I am writing this review in response to one of the 1-star reviews that claims this product does not work with the iPhone 2.1 or 2.2 software updates. I purchased the product for my brother as a Christmas gift, and was a little worried that it would not work. My brother and I have been playing around with the battery all day today on our v2.2 iPhone 3Gs... and I can verify that it works PERFECTLY!

We have not had any problems working with the battery, and it's nice that you can charge your iPhone even with the battery connected. Great product with a great price from Amazon!

Provides a simple and wonderful extension of your battery when you need it most. It charges the IPOD instead of only acting as a battery and does so quickly.

Knocks (hard to do on something that I think is wonderful). You cannot use the headphone port when the unit is attached. Would be terrific if either it were shaped differently to allow access or had a pass through port that allowed use of the headphone jack.

Have had this item for only a few weeks and it is used almost daily. Kids love using the Ipod Touch and quickly deplete the battery but this keeps them happy for many more hours of fun. Am giving kids an Ipod Touch for Christmas and will certainly be picking up a couple of these as well. You can't go wrong with this item.