My lead acid waz dead so I went on Egay and found a 12v 20ah battery designed for alarm systems and I gave it a try. I worked well on my civic and should work on most 4 cylinder cars, They also have a larger one that is 12v 30ah if you live in cold climates. going from a 35lb lead acid to a 14lb AGM should make a small difference in stop and go traffic because less force is required to get the car going again from a dead stopp.
$40 Lightweight battery - YouTube