Last week I ordered an optima red top for my car, it is scheduled to come in in another week. This morning on my way to work my cars battery died so later today i am going to buy another optima red top locally. Currently i only have a 90 amp stock alternator however in the near future I will be getting a 160 amp, also i currently have a 35 farad digital capacitor. My question is should i return one when my new battery comes in or should i just keep both and put one in the back with my sound system?