Comparison Exide Start-Stop EFB EFB EL605 vs Dorozhna Karta C-Class 6CT-60L

— Maintainable. Only classic lead-acid batteries (see "Type") can be serviced: they are easy to distinguish even externally — by the presence of removable plugs that provide access to internal containers with electrolyte. The latter is a mixture of sulfuric acid with water, and with each charge, some of this water "boils away" (decomposes into oxygen and hydrogen and evaporates). This happens especially intensively during overcharging or charging at high voltage. Battery maintenance consists of periodically replenishing the water reserves in the electrolyte — without this, a decrease in its level leads to damage to the plates due to contact with air, which irreparably worsens the battery's characteristics. On average, maintenance should be carried out 1-2 times a year (15-20 thousand km of mileage for a passenger car) and these periods usually coincide with the terms of 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, since even a relatively small amount of foreign impurities can damage the plates.

— Maintenance free. As the name suggests, such batteries do not require the maintenance described above; this is achieved in a number of ways, in particular by filling the elect...rolyte with a reserve for the entire service life or using gel (see "Type"). With obvious advantages due to ease of use, maintenance-free batteries at the same time have one drawback: they are much more sensitive to deep discharge (capacity decreases), and, accordingly, tolerate cold and long periods of downtime worse.

The form factor describes the general design features of the battery, primarily the way the terminals are installed and their dimensions, as well as the dimensions of the battery itself.

— European. A distinctive feature of European batteries are the terminals, somewhat recessed into the case. Due to this, this form factor is considered safer than the Asian form factor — the risk of a short circuit is lower when the battery falls on a conductive surface or when a metal object hits it. In addition, the terminals themselves are usually made in the form of Euro cones (see below for more details). As for the dimensions, European batteries have more depth and less height than Asian ones. As the name implies, this form factor is found in cars of European manufacturers, mainly passenger cars.

— Asian. Asian batteries are easy to identify by the terminals protruding from the top of the case; also, these terminals can be noticeably thinner than European ones, because. many models use JAP cones (although not all). If compared in size, then the "Asians" are taller and thinner than the "Europeans" (more precisely, they have less depth). This option is popular with Japanese and Korean automakers, and is also quite widespread among trucks.

— American. A rather rare form factor on our roads — due to the fact that cars from American manufacturers are most often delivered to us in the form...of modifications adapted to Europe or Asia; original versions are rare. Lightweight batteries of this form factor have "USA" screw terminals (see "Terminals"), located not on the cover, but on the front wall of the case. At the same time, both “purely American” and combined batteries are produced, which, in addition to a pair of USA terminals on the front wall, also have contacts on the cover that are more familiar to east european drivers. And in cargo batteries of this form factor, the terminals are usually installed on the cover, in the left side location.

When choosing a battery, it makes sense to clarify which form factor is optimal for your car: a discrepancy in this parameter can cause compatibility problems up to the complete impossibility of installing a battery.

Among car batteries there are lead-acid (SLA), advanced lead-acid (EFB), absorbent glass mat (AGM), gel (GEL), lithium-ion (Li-Ion) and LFP (LiFePO4). More about them:

— SLA (lead-acid). In a broad sense, the vast majority of modern car batteries are lead-acid, since their design is based on a combination of electrodes made of lead compounds and an electrolyte, the role of which is played by sulfuric acid diluted with water. Specifically, in this case, we mean the classic type of batteries that use a regular liquid electrolyte. Their widespread use is due to the simplicity of the design and low cost in combination with good capacity and starting current indicators (see below), as well as resistance to low temperatures (compared to other types of batteries).

— EFB (lead-acid). An improved subtype of lead-acid batteries with a longer service life, a high degree of safety and a virtually maintenance-free design. The abbreviation EFB stands for Enhanced Flooded Battery, which means "Improved battery with liquid electrolyte". A distinctive feature of EFB technology is thick plates made of pure lead without any impurities. The positive plates in the battery design are wrapped in special "bags" made of microfiber, which absorbs and holds the liquid electrolyte.... As a result, intensive shedding of the active substance is prevented and the sulfation process during deep discharge of the battery is significantly slowed down. And due to the homogeneous structure of the electrolyte (mixed during natural movement of the car), the overall service life of EFB lead-acid batteries is increased and the charging speed is increased.

— AGM (absorbent glass mat). A type of lead-acid batteries, also known by the abbreviation AGM. The main design feature is described by the name itself: in such batteries, the space between the plates is filled not with liquid, but with glass cloth — microporous plastic, which is impregnated with the electrolyte itself (an aqueous solution of sulfuric acid). This design has a number of advantages over the classic one: for example, AGM batteries do not require maintenance (see "Maintenance") and practically do not emit gases during charging (the resulting oxygen and hydrogen recombine inside the battery itself), are resistant to shaking and are well suited for start-stop systems (see "Start-stop support"). Their disadvantages are high sensitivity to increased voltage during charging, the need for a special charger (regular ones are not suitable), and also the high cost.

— GEL (gel). One of the subtypes of lead-acid batteries, in which the electrolyte is not liquid, but thickened to a gel-like state. This design provides a number of advantages compared to the classic version (see above): a greater number of charge-discharge cycles (and therefore a longer service life); minimum leakage of electrolyte and associated gases; no need for maintenance (see "Maintenance"); resistance to deep discharges and temperature fluctuations, etc. On the other hand, GEL batteries are noticeably more expensive.

— Li-Ion (lithium-ion). Lithium-ion technology was originally used in batteries for portable gadgets such as mobile phones, but such batteries are becoming more and more widely used. The first type of transport to use Li-Ion technology were motorcycles. The advantages of such batteries over more traditional varieties include smaller dimensions and weight, the ability to produce high starting currents and charge with high currents (the latter significantly reduces the charging time), as well as a large number of charge-discharge cycles and a long shelf life. In addition, Li-Ion batteries contain a minimum of harmful substances, do not use acids or heavy metals, and some models are positioned as completely harmless to the environment. The main disadvantage of lithium-ion batteries is their very “biting” price.

— LiFePO4 (LFP). Such batteries are actually a modification of lithium-ion batteries (see the corresponding section), developed to eliminate some of the shortcomings of the original technology. They are notable, first of all, for their high reliability and safety: the probability of a battery “explosion” during overload is reduced to almost zero, and in general, LiFePO4 cope with high peak loads without problems. In addition, they are quite resistant to cold and maintain the operating voltage almost until the very discharge. The main disadvantage of this type is a slightly lower capacity.

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.

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").

The possibility of using the battery in cars equipped with a start-stop system.

The start-stop system was created to save fuel and reduce harmful emissions in a modern city, when cars are often forced to stop at traffic lights and in traffic jams. In such cars, a simplified procedure for turning off and starting the engine for short stops is provided: for example, standing at a traffic light, the driver turns off the car by pressing a button, and when the green light turns on, he starts the car by simply pressing the clutch pedal. This provides significant fuel savings, but repeated starts significantly increase the load on the battery — conventional batteries can wear out in a matter of days. Start-stop support allows the battery to work effectively in multiple starts, maintaining its characteristics for a long time.