Microsoft still adheres the battery to the rear case and still warns users not to remove it.

Pretty ironic, considering they clearly know their way around a user-friendly means of securing a battery—screws.

If you're looking for the secret of the Surface Pro 2's juiced-up battery life, look elsewhere: this is the exact same "Escalade" 42 Wh battery we saw earlier this year.

Instead, look to better power management and the Haswell i5 chip, which ensures that the tablet drinks in moderation.

The two battery cells are wrangled by a Texas Instruments BQ30Z55 cowpoke battery pack manager.