5. Throttle your CPU. Some laptops are loaded with CPU throttling software, which allows users to reduce the machine's processor speed to conserve dell laptop battery life. Throttling the CPU can significantly increase battery life, but will limit the processes you're capable of running, so only use this feature if you're performing light tasks, such as moderate web browsing or word processing. The location of the throttle feature (if your laptop has it) will vary based on your machine's specific make and model; consult your laptop's manual, or check out the manufacturer's website for more info.