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 plug.
The second is the capacitance, measured in ampere / hours (A/h), means, roughly speaking, the amount of electricity stored in the battery. It depends on the capacity how long you can turn the engine with the starter, more precisely, how many attempts you can make to start the engine.
The price of a battery is almost directly proportional to its capacity.
And the third characteristic is the starting current (measured in amperes. A), i.e. current supplied to the starter during cranking. On batteries, it can be indicated according to four different systems: GOST (on domestic), EN (European standard), SAE (american standard) and DIN.
The last, German standard, is closest to our GOST and is installed on most European batteries "default", i.e. when the standard system is not specified. The larger it is, the faster and with more force the starter will turn the engine.
It is better if you buy a battery with the characteristics that are indicated in the operating instructions for your car: this way it will last you longer at minimal cost. You can save money and buy a battery with a smaller capacity, but it will serve you less than usual and will not cope well with winter starting. If you buy a battery of even a slightly larger capacity, you will not win in terms of service life, because. 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 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 is full of low-quality goods and fakes. Batteries are no exception. There are several signs by which it is possible to distinguish the original from the fake with sufficient accuracy.
First and, perhaps, most importantly, the country of manufacture and the producing plant must be indicated on the battery, it is better if with an address.
Secondly, the date of manufacture must be indicated, which is very important if the battery is flooded. Each battery must be accompanied by a technical data sheet, but the presence of instructions is optional. 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 output terminals, often lubricated with technical protective grease against oxidation and covered with colored plastic caps on top.
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