It's very cold. Why did the car battery suddenly die?

This is because the battery is dead for the following reasons:

1, temperature coefficient

That is, the weather is also an important factor. Because low temperature will greatly reduce the performance of the battery. For example, the performance of the battery is very poor, and it is fine in summer, but in winter, with the decrease of temperature, the performance of the battery is further reduced, which will lead to the situation that the battery cannot catch fire due to power failure.

2. Self-loss

Even if the battery is not connected, there will be a certain amount of power loss. If the car doesn't move for a long time, it can't be charged, but it uses a lot of electricity when it starts, and it is easy to lose power. If the battery loses power once, the performance of the battery will drop a lot. With the increase of electricity consumption, the battery will continue to shrink.

3. Power release has cliff effect.

The discharge of battery has cliff effect. That is, the discharge curve of the new battery is relatively linear. After long-term use, the battery with serious performance degradation seems to be full, but when it reaches a certain amount, it will suddenly die.

Extended data

Matters needing attention in daily use of batteries

Usually, the service life of a car battery is two to three years. If this time limit is exceeded, once the car is stopped for two or three days, it is very easy to lose power. If you don't need a car for a long time, it's best to drive out for a walk every two days 15 minutes or so, which can effectively alleviate the power shortage. In addition, remember to turn off the lights and unplug the car every day to avoid unnecessary losses.

It is a common problem for many new car owners to forget to turn off the interior lights when parking and turning off the engine. After a night's consumption, the battery may be dead at any time and the car will not start. In this case, if conditions permit, you can try to charge the battery. If it still doesn't work, you may need to replace the battery.