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The application of engine start/stop systems is becoming increasingly popular. It requires special batteries, which are more advanced and have a longer service life than ordinary batteries, but their prices are definitely much higher.

Vehicles equipped with start stop systems cannot use standard batteries, even if the capacitance is large. They cannot withstand much higher current intensity during charging, and their service life is limited. According to tests conducted by Exed, a leading automotive parts manufacturing company in the United States, a regular battery can be charged 20000 to 25000 times while a special battery mentioned above can be charged 60000 times while imitating urban driving.

For vehicles with intelligent management of AC generators, ordinary batteries are even less capable, because charging is done during deceleration and braking, and the current intensity borne by the battery is greater at this time. On models equipped with start stop systems, two types of batteries are generally used: EFB (Enhanced Flooded Battery) and AGM (Absorbed Glassmat, Glass Fiber Adsorption Battery). Compared with ordinary batteries, the first type of battery has made many improvements in details, while the second type is more advanced. Its electrode plates are not immersed in electrolyte (diluted sulfuric acid), but rather adsorb most of the electrolyte onto porous glass fiber partitions. In addition, the gas generated during the charging process will be attracted through chemical reactions, and the battery will be completely sealed, so the battery can be installed inside the driver's cabin. But AGM batteries also have their shortcomings. They cannot withstand high temperatures, so it is important to prevent them from being installed near the engine, otherwise good ventilation must be maintained, as MINI has done.

EFB batteries are suitable for vehicles with start stop systems without intelligent charging management, such as the Fiat 500 and Alpha; Romeo Giulietta, when equipped with an intelligent management system for AC generators (such as BMW EfficientDynamics), should use AGM batteries because they can withstand high-intensity charging currents, thanks to special isolation devices, thinner grids, and special mixtures of electrodes that reduce internal resistance. In addition, unlike traditional batteries, the single substance that makes up an AGM battery is compressed before entering the electrolytic cell, which allows it to effectively resist vibration. The manufacturer has transplanted many of these technologies into EFB batteries, thereby increasing their charging and discharging times, allowing them to withstand high-intensity charging. However, it still does not reach the level of AGM batteries.

In short, unlike in the past, batteries have once again become the focus of designers, not only for electric and hybrid vehicles, but also for ordinary cars. So far, we have been talking about lead-acid batteries (still operating according to the principles proposed by GastonPlanté in 1859), but the situation with this type of battery is much more complex than before. Previously, charging a battery would not have any problems, but now it is important to be vigilant to prevent malfunctions (as shown in the figure below). In the past, according to a relatively regular cycle, anyone could replace a broken battery. However, now due to the lack of appropriate equipment and information, some electronic control systems may not be able to make accurate judgments, and sometimes can only rely on analytical instruments to inform the electronic control system of relevant information.

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