Thread: High Amp Alt vs. Bigger Cap

Originally Posted by reinke

true but very false at the same time. adding extra batteries will help with the car off but also give oyu more reserve power. basically once you extra batteries are fullt charged it will take longer for your lights to dim. i have 7 extra batteries (8 total) in my truck and my lights do not dim at all. i am also running a stock 130amp alt. adding extra batteries will help drastically.

taken from Car Electronic Basics

Many people are under the impression that adding a second battery will cure their electrical problems. If one battery is good then two must be better. Right? Wrong. Remember that the function of a battery is to start the vehicle and to provide power when the vehicle is not running. The only thing a second battery will help you with is "parking lot" listening time. Basically it will provide you the additional capacity to run your stereo longer without starting the vehicle. After the vehicle is started the second battery becomes another load on an already overworked alternator.