If you're waiting for Transformer Prime, HTC Quattro or other Tegra 3 devices, you'd already be thinking about how the quad core would impact battery life. Most users think quad core would use every possible bit of battery life available faster than dual core devices do, but Tegra 3 is going to be different.
Chief executive officer of Nvidia, Jen Hsun, said, "We save as much power in the backlight without changing the visual fidelity at all to save, essentially, the entire power used by our chip." The touchscreen uses much of the phone's power. Tegra 3 comes with DIDIM technology which optimises the energy use per pixel, per frame and hence the end result in battery saving is huge.
The technology adjusts the backlight of images on the screen to save battery. When the processor is fully active, it consumes only 1-2 Watt. The display consumes 3-6 Watt as per brightness, so the DIDIM technology saves more power than the Tegra 3 CPU uses.
Source : Themobileindian