Want to increase Samsung Galaxy S III battery life? Undervolt Samsung Galaxy S3 Quad Core Application Processor is one of the ways to do so. Besides Samsung Galaxy S3 4.8″ HD Super AMOLED screen, Quad Core Application Processor is another big battery eater. Undervolting helps to reduce Samsung Galaxy S3 battery usage, and will make Samsung Galaxy S3 cooler (generate less heat) too. Unlike underclock which may not be so efficient in performance / walt ratio. Undervolt surely will improve battery life because it maintains the overall performance speed while lower the battery usage. As usual, you need to install custom kernel for Samsung Galaxy S3 in order to undervolt. Stock kernel does not support it.