[VegasDude]

I think with a new battery you'll have less of a problem. The same thing was happening to me with a 5 year old battery, then again with a one year old battery, but I also think the Vegas heat was taking it's toll as well.

If you have a manual, another option is to install an engine kill switch. I've done the same thing, and when approaching a light I know is going to be red by the time I get to it, I can force the engine into DFCO even if the revs are too low to normally allow it. I'm not using any extra gas to do this, since I would normally use EOC and the brakes. The extra time that the car is in DFCO helps keep the battery voltage up. I also have a digital voltage readout in the car and if I'm running low, I'll bump-start the car before I stop at a red light. Otherwise I run the risk of having to get out and push.

If you were to buy a new battery, place it anywhere in the car, and wire it in parallel with the old battery, you WILL need a heavy duty cable if you plan on starting the car without disconnecting it first. There's no way to tell which battery to supply the current if they are both connected at that time.

I've also thought about using a seperate lipo battery for the head lights, or building custom LED bulbs with a few 5 watt LEDs in place of one 55 watt halogen.