Also, home depot sells various exide batteries. I replaced the one in the G last fall with the exide 24fx. It's $90 with a 40 month free exchange. Slightly bigger than whatever the car came with but still fit well. It's a pretty beefy battery. Was $100 last year, now $90.
800-cold cranking amps at 0-degree F
960-cranking amps at 32-degree F
120-minutes reserve capacity at 25-amp
40-month free warranty 24-hour emergency jump start
Exide Extreme 24F Auto Battery-24FX - The Home Depot