Whether you need to disconnect your car battery to charge depends on several factors, including the type of charger you have and the vehicle manufacturer's recommendations. Modern chargers are often equipped with protective mechanisms such as reverse polarity and short-circuit protection and can absorb voltage peaks, so that it is not absolutely necessary to disconnect the battery. However, it is recommended that you consult your vehicle and charger manuals to follow model-specific instructions​.
A battery monitor from HOOTS, controlled via an app and software, enables detailed and user-friendly monitoring of battery systems and chargers. In some cases, particularly in older vehicles or chargers without these protection mechanisms, disconnecting the battery may be advisable to protect the vehicle's on-board electronics from possible damage caused by voltage spikes during charging. It is also a common practice to disconnect the negative terminal cable to provide an additional layer of safety, especially if you are unsure whether your charger has the necessary protection features. In summary, with modern chargers and vehicles it is often not necessary to disconnect the battery for charging, but it may be recommended in certain situations or if you are uncertain about the protective features of your charger. Always following the specific instructions for your vehicle and charger is the best way to be safe.