Mapping an entire space in 3D requires a hefty source of power. Luckily the Project Tango tablet has just that.

From Google: "The battery is custom designed to be dual cell for max power drawn when necessary—again, we want no compromises for the developer wanting to pull juice and kick out heat."

A bit of light adhesive is all that anchors the battery to the front panel assembly.

The dual-cell 7.6 V Li-ion polymer battery is rated at around 18 Wh of energy, well over the Tango Phone's already-hefty 11.1 Wh.

For a relevant consumer tablet comparison, the Nexus 7 2nd Generation featured a 15 Wh battery.