I have an Dell Inspiron 8000 laptop with a battery that will not charge. I want to use it for a car pc. Once installed I don't plan on removing it. I really don't want to have to buy the docking station. I don't care about disassembling the laptop. What do I need as far as power supply, switching on and off, etc. I tried looking for step by step installs for what I plan on doing, but I can't find anything. Help me please.