Bump each of those hours down by a 1 to 2 hours and I think you probably have a more realistic battery expectations.
Up to 5 hours and 30 minutes
Primary Battery and
Up to 12 hours and 30 minutes
Primary Battery and optional 12-cell Ultra-Capacity Battery
Up to 16 hours
NOTE: Battery life will vary depending on the product configuration,
System Standby Time
Up to 1 week
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