For most common battery types, such as lead-acid and lithium-ion, fully charged voltages vary: lead-acid batteries typically read 12. Knowing these values helps ensure proper usage and maintenance. . At What Voltage is a 12V Battery Dead? A 12V battery is considered dead when its voltage drops below 10. It's important to monitor your battery's voltage regularly to avoid reaching this point of no. . So, what is considered normal battery voltage? The answer is not as straightforward as one might think. It's the most common voltage type you'll encounter and is a good starting point for understanding a battery's power potential.
