your internal 1.4g will accomodate <> 2500 books on average , I have a 4gb sd ARD WHICH i USE AS A BACK-UP, THE MAIN DRAIN WITH THE CARD IS IF YOU ARE CONTINUALLY REMOVING IT AND ADDING IT BACK IN, i HAVE USED MY T1 WITH THE CARD INSERTED AND HAVE NOT NOTICED ANY REAL SUBSTANTIVE CHANGE IN THE BATTERY LIFE
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