There are some of us that need to save as much cell phone battery sometimes so here are a few tips. Some of this tips work also for laptops.
Turn off your phone’s Bluetooth detection and darken the screen display.
Turn off the phone when you’re not using it. Good to know for that 5 hour wait at the airport tonight.
Set the network speed to “slow”.
Disable any bluetooth lights, fun lights, or any unncecesary lights on your phone. Any external display or lights will continually wake up the CPU and power management controller which may drain more battery than the original function.
If you use bluetooth, set your phone to ‘hidden’ so it does not make it discoverable continuously.
Disable the screen saver. When this activates, it wakes up the screen using more power.
When you are in an area where you don’t have signal in your phone, turn it off or switch to airplane mode (disables all RF functions). It will continually page the network otherwise and completely drain you battery in 2 hours.