12Volt IN, Adjustable output power source!

Step 4

Here is where I fall short in electrical know how.

What I WANT to do is bypass the inverter as it is not very efficient and will consume alot more battery power than it should by charging my phone.

How to do this?

Batteries are 12V DC. Your car's cigarrette lighter output's 12V DC, and so when you charge your phone via the cigarette lighter - you are charging it very efficiently (by passing any inverters - you don't need AC!)

What I want to do is have a connection directly from the battery with variable outputs - 2.5, 3, 5, 6, 9, and 12V without changing my car-charger every time I want to charge something new! I will be giving this more thought, and attempting to execute its design soon, if little response is given and here is how [note: not very cool or geeky, but will get it done!]:

Take 4-5 different car charges, and connect their inputs directly to the battery. Each one will have a fuse & diode to prevent disaster. They will be packed neatly inside a box, while a 5-6 way switch (need one for 'off') will determine which output is going to be used. The output will be connected in series to two different types of output : mini USB and one of my choice (possibly a interchangable one from radioshack).

I'll make a diagram of what I mean.

Notes:
This will only be used to power one thing at a time! Firstly because the outputs will only be of one type of voltage, and secondly I don't know how well a car charge can handle amperage of multiple things being charged!