Griffin TuneJuice Charger for iPod and iPhone (Black)

• Charges iPhone or any iPod with a dock connector
• Uses 4 AAA batteries (included)
• Up to 24 more hours of music, 6 hours of video, 2 hours of talk time, 15 hours of web access
• Made for iPod, Works with iPhone certifications pending
• Replaces 9736

I travel by air infrequently and need a solution for topping off an iPhone when I'm on a long boring flight. If you are *regularly* away from a power source (car, wall socket, laptop) then consider getting an alternative rechargeable iPhone battery pack.

The Good: Great for infrequent travel, you don't have to charge it, you can buy batteries at any store, its cheap ($20 vs $60+).

The Bad: It takes one (1) set of Energizer Advanced Lithium AAA at $6.99 or two (2) sets of alkaline at $5.99 (Duracell AAA) to charge an iPhone 3Gs from 20% to 90%. (I've done two days of careful testing to arrive at these numbers)

As you can see, there's a benefit to a rechargeable battery system for frequent fliers, and a lot of convenience with this product for infrequent users or for people who need an "always ready" emergency top off solution.

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Or maybe I have a lemon -but what can go wrong?

My TuneJuice has *maybe* a 10-minute effect on my iPhone (when I can measure any effect at all), and I've tried at least four sets of alkalines and several passes with rechargeables. In fact, I tried so many combinations that it was too late to return the thing to our Apple Store.

For what it's worth, I accidentally bought a battery extender from Ryobi (thinking it was their flashlight they look a lot alike)... I think it was $20, but you also need a battery ($12) and charger too, but the Ryobi has not only given me excellent results (hours, without running low) but even charged up my iPhone. (And btw: the Ryobi flashlight, which I did end up getting, is by far the best LED flashlight I've ever seen -lights up the fence across the street.)

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This product did not work on my iPod touch as advertised. It did work on my daughters nano, but that is not why I bought it.

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I bought this product (from BestBuy) to charge my iPhone 4 with rechargeable NiMH AA batteries. It included 3 non-rechargeable alkaline batteries that worked fine out of the box. I only tried them for a minute or two to test that the unit worked. I tested with several sets of fully charged NiMH rechargeable batteries and was unable to get the iPhone to begin charging. Rechargeable batteries put out a lower voltage than conventional alkaline batteries.

I ended up returning it, and getting the Tekkeon TekCharge MP1550 (on Amazon) instead: Tekkeon TekCharge MP1550 and am very happy with it.

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It's great, good size, handy, portable and lightweight. I think it's a great product but I think that it really doesn't work well with the iPhone. It takes 4 AAA batteries but they get used up very quickly and doesn't charge as much in comparison to when I used it to charge my iPod. It lasts a long time for my iPod and nearly charges the battery to full. I suggest you don't buy it to charge an iPhone but it works well with other products.