This rating will help in choosing a battery to meet two factors. The first is that it has the needed storage capacity to operate the lights between recharging. The second is that it has enough power to operate the buggy lights correctly. We must have a battery that can do both. Definition - An ampere tells us how much current is flowing in a circuit.
Amps multiplied by the time operated in hours is the energy used in Amp-Hours.
Most battery makers recommend that the current draw on the battery, in amperes, not be more than 5 percent of the amp-hr rating of a battery. Working the other way, we could calculate the smallest size of battery for a given load. Battery Amp-hrs equals Amps divided by 5 percent. If a buggy has a lighting system like the one below, we can calculate the amperes needed by simply summing the loads. For each hour on the road, the example buggy would use 8.4 amp-hrs.