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I travel with 5 extra 9-volts (which makes security look at me suspiciously) and haven't been let down yet. I'm not sure what happened to the 1-star people. The only weakness to the TuneJuice is that the wires connecting it to the 9-volt battery are thin and can snap if you aren't gentle. The trick is to always have some power in your Ipod so recharge your Ipod fully before you leave, then use it for a while until the battery indicator drops a bar or two.
I highly recommend it. Your power bar will jump to full and stay that wait for at least 3 more hours. I frequently travel to Africa for work and the flight from DC to South Africa is about 18 hours, not to mention the 2- to 6-hour intercontinental flights. my guess is that they tried to use it to charge their dead Ipod battery.
A few 9-volt batteries kept my old 80GB and new 120GB video Ipods going for hours and hours. Once you see the power bar drop again, replace the Tunejuice battery and you are back to full power. THEN attach the Tunejuice. I have given 3 as gifts and recently bought myself a second one since I see TuneJuice 1 is being phased out and I would hate to travel without it.
But I have had mine for 3 years now and have logged at least 300 hours in the air with it and it's worked like a charm. My TuneJuice has been an absolute lifesaver on these long flights.
It will give you a much better back up. The TJ2 works off AAA batteries and works MUCH longer. I ordered this and then realized that there is a TuneJuice 2.
I've tried 5 of these on 2 different iPods, and the results are the same every time. If I could rate this product lower than 1, I would. Don't waist your money, as I did. It will work for a few minutes on my iPod 40GB, then everything freezes until I disconnect it.
It must be used before your pod gets low or it will not work. But it will not work with a drained ipod battery. It is ok for occasional trips where you may need an extended time on the pod. It is fragile and breaks easily. The pod must be turned off when plugging it in or it will not work. This does not charge, just extends playable life with a 9 volt by about 6 hours.
Unfortunately my iPod only lasted through two 40-50 minute television episodes. In any case I recommend TuneJuice as a good way to squeeze in a couple more videos with just one 9V battery. I chose TuneJuice because of its size and need for only one 9V battery. So instead of watching just two episodes of Law & Order I can watch four (maybe the beginning of a fifth show).
My only complaint is that TuneJuice only connects to the iPod with its cable. I make several overseas trips a year.
I was very happy to learn that there are a few external battery options for the iPod. I'm somewhat leary of simply letting TuneJuice hang from the cable as it seems that it could be damaged in this way.
I have used my TuneJuice with both alkaline batteries and NiMH (rechargable) batteries not seeing much difference in performance between the two. After several overseas trips I've found that TuneJuice doubles my iPods video playback.
The trips became even more interesting after I received an iPod video as a present. This means that you either have to hold TuneJuice or find someway to support it (sometimes I hold my iPod and let TuneJuice sit on my tray table).
My iPod has been invaluable for killing time on these long trips.
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