What Your Car's Battery Warning Light Means - RepairPal What Your Car's Battery Warning Light Means. Every vehicle has a charging system warning light — it’s the dashboard warning light that (usually) has a battery symbol on it, or it might say “BATT,” “ALT” or “CHG.” You should see it every time you start your car; it’ll pop on for a few seconds and then go out. Buick. Volvo Service battery charging system message — Ricks Free Auto Jul 24, 2012Diagnose and fix a service battery charging system message. Service battery charging system message, generator light on, alternator light on, not charging, what does Service battery charging system mean? In the old days all cars has a generator and a voltage regulator. Then car makers switch to an alternator and voltage regulator.