Vivitek's Qumi Q5 battery dock was also shown docked in to the projector to provide portable projection without needing mains power. Be aware that the battery dock drops the projection brightness to 50 lumens, not the full 500 lumens that it is capable of on mains power.
For bright, portable projection at full brightness on battery power you may want to consider the new 300 lumen Pico Genie M400 projector. The M400 has an in-built rechargeable battery that powers your projector at full brightness for up to 2 hours, this means the unit is smaller, brighter, thinner and more portable.
See the Vivitek Qumi Q5 on The Gadget Show - Channel 5
