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I strongly suspect that they prescribe a full charge before using so that you don't -a- start trying to use it and install things immediately with an empty battery, as it draws operating current from the battery, not the charger, and may not operate correctly at this point, causing troubles either immediately or later on; or -b- start trying to use it after charging for three minutes and then pull out the charger plug to go show off your new toy to your friends and loved ones. "Watch this -- hey, it died... those b*stards!"
-Bill
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