I am taking an old HP G62-407DX apart, and I have replaced the motherboard with a raspberry pi. With some help on Superuser, I figured out what the display used. Now, I would like to know how to limit the power output of my battery. I am trying to use the battery that the computer normally uses, but on the battery, it says "10.8V 4200 mAh." I really don't want to burn out my pi, so any answers on how to do this will be greatly appreciated.
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For this situation you are going to need an adapter that converts 10.8v down to the 5v needed by the Raspberry Pi. Typically you would use what is called a Buck Converter for this. These are readily available in online stores such as Amazon, ebay, etc.
Do a search for terms such as "12v to 5v dc-dc buck converter with usb output" to find one.
Note: For your input (10.8v) you will specifically want one that accepts input voltages less than 12v.
Good luck! Let us know what you find.