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I have a backup 4705 that I keep in my drawer. Without any memory cards installed the device lasts at least a month between charges. I picked up this device when I sent my original 4705 t PPC Techs for the 128MB upgrade, not knowing how that would turn out actually turned out great!). I have a full compliment of applications loaded on it (mirrors my everyday device) and I even get the occasional alarm.
Since September 2004, I don't think I have charged this device more than 4 or 5 times max. Just looked at it and it's at 32% so I will probably charge it tonight.
On a full charge with no memory cards, you should be fine up to about 30 days. That's one big battery in the 4700.
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