The first factor that you need to consider is obviously the battery size that will best fit the physical dimensions, terminal locations and type required for your vehicle. Group size is typically based on your vehicle’s make, model and engine type.
Reserve Capacity, on the other hand is a general indicator of how long a new, fully charged battery can continue to operate essential accessories if the vehicle’s alternator fails. Amp hour and C20 capacity are indicators of how much energy is stored in a battery. This is crucial in times of desperation. You may not know when problems can happen so always be prepared to implement a contingency plan.