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The X50 series does not have persistent main memory. Hence, when the battery is completely discharged (or falls out) the backup capacitor will hold the memory for a few minutes in normal use. However, those capacitors are known to age and lose capacity, reducing useful time to seconds or even zero. Depending on how long the battery was out, you lost all memory because the backup went to zero.
The X51 series has persistent main memory, so this kind of memory loss is not so prevalent.
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