Term «unattended», (more specifically, low-maintenance) The battery indicates that this battery has reduced electrolyte losses caused by electrolysis and water evaporation and there is no need to frequently add distilled water to it.
The battery case is made of translucent plastic, which allows you to check the electrolyte level in the battery visually. If distilled water has to be added to the electrolyte more than once a year, the voltage regulator should be checked for proper operation.
During the constant operation of a serviceable car, additional recharging of the battery is not required. If the car for a long time (more than a few weeks), especially in the cold season, has not been used, it may be necessary to recharge the battery before starting the engine.
Battery life depends on many factors (conditions and intensity of operation, the technical condition of the electrical equipment of the car, etc.) and can reach six or more years. When choosing a new battery, pay attention to the location of its positive and negative terminals. Battery terminals designed for some foreign-made cars have the opposite polarity.
On sale there are batteries ready for use and the so-called dry-charged. The former can be immediately installed on the car and begin operation, while the latter must first be filled with electrolyte and, if necessary, recharged.
Helpful advice. After installing the battery ready for use on the car, check the density of the electrolyte and recharge if necessary.