The first is the nominal voltage, it is the same for all batteries, and it is impossible to make a mistake. When buying, it is advisable to check the battery with a load fork.
The second is capacity, measured in ampere/hours (A/h), which roughly means the amount of electricity stored in the battery. The capacity determines how long the starter can turn the engine, or more precisely, how many attempts can be made to start the engine.
The price of a battery is almost directly proportional to its capacity.
And the third characteristic is starting current (measured in amperes. A), i.e. the current supplied to the starter during starting. On batteries it can be indicated according to four different systems: GOST (on domestic), EN (standard of the United Europe), SAE (american standard) and DIN.
The last, German standard, is the closest to our GOST and is installed on most European batteries "by default", i.e. when the standard system is not specified. The larger it is, the faster and with greater force the starter will turn the engine.
It is better if you buy a battery with the characteristics specified in the operating instructions for your car: this way it will serve you longer with minimal expenses. You can save money and buy a battery with a smaller capacity, but it will serve you less than the usual period and will not cope well with winter starting. Even if you buy a battery with a slightly larger capacity, you will not win in service life, since constant undercharging of the battery will lead to sulfation of the plates, and you will lose money. You should also not get carried away with increased starting current: you will burn out the starter. It is better to change the oil in the engine, and there will be no problems with starting.
Recently, the country's market has been overflowing with low-quality goods and fakes. Batteries are no exception. There are several signs by which you can distinguish the original from the fake with sufficient accuracy.
First and perhaps most important: the battery must indicate the country of manufacture and the manufacturing plant, preferably with the address.
Secondly, the manufacturing date must be indicated, which is very important if the battery is flooded. Each battery must be accompanied by a technical passport, but the presence of instructions is not required. This is due to the fact that in the West, batteries are almost never sold at retail; they are installed by specialists at service stations.
Thirdly, a high-quality battery is unthinkable without a high-quality case, good plugs and smooth terminals, often lubricated with technical protective grease against oxidation and covered with colored plastic caps on top.
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