Comparison Exide Premium EA722 vs Varta Promotive Blue 640400080

— Motorbike. Batteries designed for use on motorcycles. They have small dimensions, which is due, on the one hand, to a relatively small amount of space for their placement and more stringent weight requirements than cars, and on the other hand, less stress when starting motorcycle engines, less on-board electronics and, accordingly, more soft requirements for capacity and a number of other characteristics. Also , motorcycle batteries are made as resistant to shaking and coups as possible. They can have a voltage of 6 V or 12 V.

— Auto. Batteries designed for use in passenger cars and light trucks. They have medium dimensions and a standard voltage of 12 V, but the capacity can vary significantly; see "Battery capacity" for details

— Truck (bus). Batteries designed for use in buses, heavy trucks, tractors, harvesters and other vehicles of the same weight category. They have a large capacity (usually at least 100 Ah, for more details see “Battery Capacity”), because this class of transport carries rather “gluttonous” on-board electronics, and starting the engine is associated with heavy loads and requires significant energy consumption. The voltage in this class can reach 24 V, but today such models are almost out of use, and most truck batteries produce traditional 12 V.

— Water transport. Batteries designed f...or use in water transport — mainly boats and heavy motor boats. They are distinguished primarily by increased protection against moisture ingress, as well as other negative effects associated with staying on water transport — in particular, strong vibrations that can reset the terminal or damage the battery, as well as slopes (up to the fact that some models normally allow installation "on the side", at an angle of 90 °). The terminals themselves, in fact, are often made in a special “boat” format (see below), although there are options with more traditional contacts.

The location of the terminals on the battery may vary depending on its purpose (see above) and some other features. Today there are such options:

— Standard. The standard is the arrangement of the terminals on the top panel of the battery, which is usually a rectangle, along the long side of this rectangle. It is used in all types of batteries (“See “Purpose”), and in batteries for passenger cars it is almost a standard option.

— Lateral. In this version, the terminals are usually located on the top cover along the short side of the battery, on the side, if you look at it from the front side — hence the name. Almost all models with a similar arrangement are designed for trucks and buses (see "Purpose").

— Diagonal. The terminals are located diagonally on the top cover, i.e. at opposite corners of the rectangle. Such a scheme is very rare today, most often in batteries for heavy equipment (see "Purpose").

— Central. As with the standard arrangement described above, the terminals in this case are placed along the long side of the battery top cover. However, they are not located at the edge of the lid, but are shifted to the centre — hence the name. Such models do not have fundamental differences from batteries with standard terminals, however, for a number of reasons they are relatively rare.

— Fr...om the butt. In this case, we mean the installation of terminals on the front wall of the battery, which is typical for the American form factor (see above). Such terminals can be combined with standard ones, on the cover, however, even such combined models are still considered to be "end".

In this case, polarity refers to the location of the terminals on the battery. Traditionally, it is called by the location of the “+” terminal when looking at the battery from the front side (or, in the case of side terminals, from the side closer to which they are located).

- + left. In relation to passenger cars, this polarity in the CIS countries is often called “direct” or “ours”. At the same time, in trucks (see “Purpose”) the situation is the opposite - the left “plus” is a European standard.

- + on the right. In passenger cars, the right “plus” is typical mainly for European models, for which this polarity in the CIS countries received the unofficial name “euro”, or “reverse” (as opposed to the domestic “direct”). In truck batteries the opposite is true.

- + right / + left. This marking means that this battery model is available with both right and left “plus” (see above), and you can choose the option depending on the car model.

Note that the above division into “direct” and “reverse” polarity is not absolute, and in any case, before purchasing a battery, this parameter in your car should be clarified separately.

The electrical capacity of a battery, in other words, the amount of energy stored by a battery when fully charged. The capacity value is expressed in amp-hours and indicates the number of hours during which a fully charged battery will be discharged to the minimum allowable charge, delivering a current of 1 ampere to the load. For example, a capacity of 40 Ah means that the battery is capable of delivering a current of 1 A for 40 hours, or 2 A for 20 hours, etc. In fact, a more capacious battery gives more attempts to start the engine, and is also able to work longer at a low load (for example, when powering a car audio system).

The capacity requirements for different transport types differ markedly. So, in motorcycle batteries, it rarely exceeds 20 Ah, the average value for passenger cars is 40-80 Ah (but there are options for 100 Ah or more), and for heavy equipment like buses, an acceptable capacity starts somewhere from 100 Ah. The optimal value of the battery capacity is often indicated by the manufacturer in the characteristics of the vehicle, and when choosing a model by capacity, you should focus primarily on these figures.

Battery starting power measured according to EN standard. According to this standard, the starting power is the maximum power that a battery at an electrolyte temperature of -18 °C can produce for 30 s 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 mode of operation is similar to starting an engine, when the battery has to supply high power power to the starter for a short time.

The recommended starting power value is generally related to the weight category of the machine: the heavier it is, the more powerful the power is usually needed to start. And many manufacturers directly indicate recommended values in the characteristics of a particular vehicle model. If the battery is purchased as a replacement, then the general rule is this: its starting power should be no less than that of its predecessor.

Note that in practice there may be designations for starting power 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 convert to 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 the specifications, 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").