Shutting down Mac Pro with an internal RAID

Hi,
Since I got my new machine a month ago I have never had cause to turn it off except when the power failed once! Everything was OK on that occasion. It has the Apple RAID card controlling four apple 1TB drives in RAID 0 for speed importing HD footage. My system is on a separate drive fitted in the second optical drive bay. It all works fine but I just want to check that I will not lose my RAID if I shut the computer down for a prolonged period, in this case about two weeks whilst I am away. I know that this length of time would allow the the RAID Cache battery to run down. I am not sure exactly what this battery is doing perhaps someone would explain it to me in words of not more than two syllables (I make films, I am not an IT expert)! If the computer remains attached to the power socket will the battery still keep charged even though the computer is off? Whatam I likely to find when I power up again?
Any advice would be much appreciated as I can't seem to find an answer to this on the forums.
Thanks,
David

Thanks for the quick replies. I take the point about the UPS. I am doing some research still on that one. We rarely have power failures but when we do they generally last longer than most affordable UPS units can last. The last one which I referred to lasted three hours and then went of a second time (fortunately before I got around to restarting the computer)! I thought that it was possible to get units that will initiate a proper shutdown of the computer? Is this so?
Just to clarify your point Malcolm, I bought the RAID card because it is my intention to reformat the internal RAID in RAID5 for some safety when I eventually get a larger external unit which can handle HD data rates in RAID5. If I do that though are you saying that I would never be able to turn the computer off for longer than the cache battery will last or will a proper shutdown still write everything properly to disc?
It does sound like a UPS is a must before any external RAID array is added to allow some form of shutdown procedure.
Thanks again

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