How long does the battery last in the Microsoft Surface Pro?

I call bull on that 6 hrs cause I know by the one I used it is 2.5

The Microsoft Surface Pro has a Lithium-Ion (Li-Ion), 42 WHr battery. It offers:

- 2.4 days in standby mode
- 6 hours of Wi-Fi surfing

These ratings are provided by Microsoft and should be considered "maximums".

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