Maintenance
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Serviceable. Only classic lead-acid batteries (see "Type") are serviceable: they can be easily identified even externally by the presence of removable caps that provide access to the internal compartments with electrolyte. The latter is a mixture of sulfuric acid and water, and with each charge, some of this water "boils off" (breaks down into oxygen and hydrogen and evaporates). This occurs especially intensively during overcharging or charging at increased voltage. Battery maintenance consists of periodically replenishing the water supply in the electrolyte—without this, the decrease in its level leads to plate damage due to contact with air, which irreparably worsens the battery's characteristics. On average, maintenance needs to be carried out 1-2 times a year (15-20 thousand km mileage for a passenger car), and these periods usually coincide with scheduled maintenance. However, this value may vary depending on the characteristics of both the battery itself and its operation; more detailed information is usually contained in the instructions for specific models. "Refilling" should be done exclusively with distilled water, as even relatively small amounts of foreign impurities can damage the plates.
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Maintenance-free. As the name suggests, such batteries do not require the maintenance described above; this is achieved by several methods, in particular by filling the electrolyte with a reserve f
...or the entire service life or using gel (see "Type"). Despite the obvious advantages due to ease of use, maintenance-free batteries have one drawback: they are much more sensitive to deep discharge (capacity decreases), and, accordingly, they are less tolerant of cold and long downtimes.Starting power (EN)
The starting power of the battery, measured according to the EN standard (the unified standard of the European Union). According to this standard, the starting power is the maximum power that the battery can deliver for 30 seconds at an electrolyte temperature of -18 °C without the voltage dropping below a certain level (for standard 12 V batteries - not lower than 7.2 V). The term "starting" appeared because this operating mode is similar to starting an engine, when the battery has to deliver a high-power power to the starter for a short time.
The recommended starting power value is generally related to the weight category of the vehicle: the heavier it is, the more powerful the power usually needed to start it. And many manufacturers directly indicate the recommended values in the characteristics of a particular vehicle model. If the battery is purchased as a replacement, the general rule is: its starting power should be no less than that of its predecessor.
Note that in practice, starting power designations may be encountered according to 3 more standards: SAE (USA), DIN (Germany) and TU (GOST 959-91). The first is almost identical to EN, and DIN and TU are quite easy to translate into EN and vice versa: they are similar to each other, and each of them gives a number approximately 1.7 times smaller than NE. That is, for example, to replace a 200 A battery according to TU, you should look for a model with a power of at least 340 A (200 * 1.7) according to EN.
Charge indicator
Has
a charge indicator on the battery.
Such an indicator displays the current charge level and allows you to generally assess the state of the battery literally at a glance, without additional actions and diagnostic equipment. In some models of serviceable batteries, the indicator can signal not only the need for charging, but also the need to add water to the electrolyte (for more details, see "Maintenance").
