Griffin Technology 4002-TJUICE TuneJuice Battery Backup for iPod and iPod mini

• An essential emergency power backup for your iPod
• Use wherever you can't charge your iPod
• Powered by standard 9-volt battery
• Perfect carry-on for airplanes, road trips and ski trips
• Compatibility: iPod nano (1G and 2G), iPod mini, 3G iPod, 4G iPod with click wheel, iPod Color, iPod Video

My main reason for purchasing this product was to add to my total puchases so i would get free shipping. However, i am extremely happy with this product. It will keep your ipod working for about as long as the ad claims it will (unlike apple's ipod battery claims. It's really small, about 1/2 a centimeter bigger on each side than a 9volt battery. It's so small that i just chuck it in my bag and forget about it until my ipod shuts off because i forgot to charge it, and then i praise the fact that it's there. I would recomend this to anyone who is away from a charger for extended periods of time, or if they forget to charge things, just like i do. Other rechargable batteries might last longer, but this is a cheap emergency solution. Because of these facts... I give this product...a 5-out-of-5.

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I bought this item when my ipod mini decided to get a brain and shut off at random times claiming dead battery. Plugged the tune juice into the dock port, and voila! Music for hours and hours..The 9-volt battery is a little wierd, but if it works, it works. The size is great though, unlike another product *ahem* Belkin, it can fit pretty much where ever you store your ipod and take it out when you need it. I never leave home without it now.

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The Griffin Tune Juice is an accessory for your iPod that extends the playing life of the iPod. It runs on a 9v battery and connects to the iPod via the docking port. The Juice Tune extends the playing time of your iPod for up to 4 hours, making it convenient for those long flights we often have to take or camping trips. I have also used the Belkin Backup Battery Pack for iPod w/ Dock Connector. The Belkin product uses 4 AA batteries and has suction cups that actually connect the pack to the iPod. It also has 4 LEDs that lets you know the battery power still remaining. It provides up to 15 hours of extra play time.

I find the Belkin product better for my circumstances for a number of reasons. Although there is an initial high cost ($59.99 vs. $19.99), in the long run getting 15 hours of 4 AA batteries vs 5 hours from 1 9V battery is more economical. I also like how the Belkin Battery Pack attaches to the iPod itself. It becomes one integrated unit instead of 2 components attached to each other by a cord. The battery life indicator on the Belkin is a very convenient benefit also.

If you are concerned about weight and only need a few extra hours the Griffin Tune Juice may be a better product, but for my uses the Belkin fits the bill.

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Having received this item as a gift, I decided to do a few tests with it and my ipod video 30gb. First I ran a movie, medium sound volume, on my ipod alone with it fully charged. It lasted 137 minutes (2 hours, 17 min.). Then I *fully* recharged the ipod and plugged it into the TuneJuice with a brand new 9v. On the same set of movies, it lasted 202 minutes (3 hours, 22 minutes). So you'd get about an hour of extra power. Not bad for the price.

However, there are some things to consider. This is a one shot deal: when the ipod battery runs out, you will not be able to use the TuneJuice to recharge it. The 9v is not powerful enough to run the ipod by itself, and so the ipod will be draining both the TuneJuice and its own battery simultaneously. The ipod battery will drain faster than the 9v and run out before it.

The next day, we tested the 9v we used and it was still good. So you will be able to use the same 9v more than once.

So bottom line: in order to get the full use of the TuneJuice, you have to plug it in when the ipod battery is fully charged. Once the ipod's battery runs out, which it will, the TuneJuice is useless no matter how many 9v batteries you have with you or how charged they are. You will have to recharge your ipod battery.

It's good, then, if you only need your ipod video to last that extra hour and no longer.

For anybody who has a video ipod (I have the 30g model), this is a must if you want to watch videos on your ipod and your travel time is likely to take more than 2 hours.

I also carry an extra 9v battery, just in case.

I've had absolutely no problems with this unit and use it constantly on planes.