What is the minimum instantaneous voltage required for a car battery during ignition?

[MaxDella]

There is no fixed value for the instantaneous voltage of a car battery during startup, as it depends on the starter motor's power and the battery's capacity. Generally, it falls within the range of 9-12V. The starting voltage of a car should not drop below 9V; otherwise, it may cause difficulty in ignition. If the engine fails to start, it indicates that the battery is severely depleted, and a jump start is necessary. Steps for jump-starting a generator: 1. Ensure voltage: First, make sure the auxiliary battery is safely at 12V and the negative terminal is grounded. Also, turn off all unnecessary lights and accessories to prevent electrical accidents. 2. Connect the jumper cables: Be careful not to reverse the positive and negative terminals of the cables, as this can cause sparks when connected. Ensure the cables are tightly wrapped around the battery terminals (for full contact) to avoid sparking during the process. 3. Start the engine: Start the engine of the vehicle with the auxiliary battery and let it run at medium speed, then start the engine of the vehicle with the depleted battery. 4. Disconnect the cables: Finally, disconnect the cables in the exact reverse order of connection.

[VanessaMarie]

When starting the engine by battery, the instantaneous voltage must not drop below 9.6 volts—this is my personal experience. Last winter, my car kept failing to start, and after testing, it was found that the voltage had dropped to just over 8 volts. The mechanic explained that the starter motor requires a strong current to turn the engine, and if the voltage falls below 9.6 volts, the current will be insufficient, leading to failure. If the battery is aging or has a power deficiency, the voltage is more likely to drop sharply at the moment of ignition. Now, I use a simple voltmeter every month to check and ensure the battery voltage stays around 12 volts for stable operation, and during cold weather, I also make sure to park indoors for warmth. A battery typically lasts three to five years, and regular checks can prevent breakdown troubles, saving a lot on towing fees. Safety comes first when driving, so never overlook the health of your battery.

[HeidiDella]

The battery voltage must not drop below 9.6 volts at the moment of ignition. I recommend car owners pay attention to this regularly - starting becomes risky if voltage falls below this threshold. Battery aging or electrode corrosion can cause sudden voltage drops, preventing the engine from cranking. Long-term neglect may even damage the starter motor. Using a household voltmeter, measure around 12.6 volts before starting; if voltage plunges below 9.6 volts during ignition, replacement is due. Common causes include leaving lights on (draining the battery) or frequent short-distance driving. Prevention is simple: check voltage during routine maintenance or install a voltage monitor. Don't underestimate this - it saves roadside headaches.

[Simon]

The battery voltage must remain above 9.6 volts to start the car normally. I encountered difficulty starting my new car shortly after driving it, and a friend taught me to use a voltmeter for testing. Occasionally, the voltage dropped to just over 9 volts, and it turned out that low voltage couldn't provide enough current to power the motor. Therefore, I now regularly check the battery to avoid depletion, such as cleaning the electrodes to extend its lifespan. Although there are many technical explanations, the key point is to ensure the voltage doesn't drop below 9.6 volts before ignition; otherwise, you'll need to address the issue or replace the battery.