More and more drivers are choosing to charge their batteries while leaving the terminals connected. Some find this convenient and safe, while others are concerned about potential issues. But what do the experts really say?
After turning off the engine, the battery continues to power various systems in the car. The normal voltage of a fully charged battery is around 12.7 V, and when the generator is running, it rises to 14.4 V. Thus, leaving the terminals connected, the voltage remains in the network, allowing the electronics to operate stably.
If you have turned off the car and are using a modern automatic charger, the risks are minimal. Such devices limit the current and automatically regulate the voltage, allowing for safe battery charging.
There are cases when connecting a charger directly to the battery can pose problems:
Voltage spikes. Excessive voltage can damage the ECU or the ABS system in the car.
Short circuit. During the connection of wires, there is a risk of a short circuit, which can lead to blown fuses.
Professional equipment. High-powered chargers with manual voltage adjustment should not be connected directly to the car.
Unacceptable conditions. It is not recommended to charge the battery while the engine is running since the generator and charger may conflict with the current.
Manufacturers' recommendations vary: some allow charging the battery without disconnecting the terminals, while others advise at least disconnecting the 'negative'. Always use a reliable automatic device, check the voltage with a multimeter, and follow the manufacturer's instructions.
Don't forget about the rules for warming up the car in severe frost.
This article discusses the issue of charging a car battery, presenting arguments for and against. Experts recommend using modern automatic devices for charging and always adhering to the manufacturers' recommendations to avoid potential issues with the battery or other car systems.