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					Originally Posted by  borisb
					 
				 
				Absolutely no reason not to   
It *is* important to fully charge it the first time, but since it comes partially charged already, why not unbox and start playing with it right away on AC?   
I'm sure you'll be thrilled by the PE.  You can post your impressions, of course, to confirm what we've all been saying    
			
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 Both the battery which came with my EE, and the spare I just bought, seemed to come with a good level of charge from factory. I plugged em for the first charge, and after a half hour an audible hiss came out from the charger, and they resulted to be fully charged. Do you hear too the hiss when the battery is ready?