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: June 29, 2018
You can also perform the test yourself if you have access to a Battery Load Tester, a device which is made for the purpose. The load tester works by placing a specific amount of electrical load on the battery for a specific amount of time while monitoring the available battery voltage. The battery should be fully charged before the test in order to insure accurate test results.
If the battery warning light (a light in the shape of a battery symbol) on the dashboard comes on while you're driving, that means the charging system isn't working, but the fault may lie in something other than the battery. The cause of the battery light could be a loose or corroded battery cable or other wire connecting components of the charging system, or it might be a problem with the alternator or voltage regulator. The alternator generates the power that is stored in the battery. If the alternator fails, or the accessory belt that drives the alternator is loose or broken, then you'll end up with a dead battery because the bad alternator isn't recharging the battery.