How to Tell if the Battery Has Power?

[CadenRose]

To determine whether a car battery has power, you can use the following methods: Method 1: Find a thin copper wire and touch it to the positive and negative terminals of the battery. If sparks appear, the battery has power; if no sparks appear, it doesn't. Method 2: Use a multimeter to measure the battery voltage. A reading of 12.7V indicates a full charge, while 11.50V or below means the battery has no power. Method 3: Use a hydrometer to measure the specific gravity of the electrolyte. A reading above 1.28 indicates a full charge, while below 1.15 means no power. For maintenance-free batteries, check the built-in indicator: green means fully charged, white means no power. If a battery symbol appears on the car's dashboard, it also indicates the battery has no power.