To acquire a realistic image of battery size, both industry and government organizations have set the following criteria.
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It is determined by the total plate area, which is calculated by multiplying the size of each individual plate by the number of plates. The battery is discharged continuously for 20 hours and the current output supplied to a standard load is measured to determine its capacity. Let’s say a battery lasts 20 hours and delivers a 4A current. As a result, it has an 80 Ah rating, which is stamped on the battery casing.
It’s one of the most recent rating systems, and it’s more realistic because it double-checks the Ah values. The capacity of a battery is determined by the number of minutes it can withstand a 25 A drain without falling below 10.5 V. The battery will perform better if this rating is higher.
Zero Cranking Power:
It was the first cold-weather rating, and it applies to crafts that operate in subzero temperatures. This zero-degree performance test reveals a lot about the quality of the battery. Large batteries are tested at 300A with the battery chilled to -18°C (0°F), whereas smaller batteries are tested at half that amount.
There are two parts to this test.
First Part: The battery is chilled to -18°C (0°F) before the load is applied for 5 seconds in this test. The voltage output is being recorded in the meanwhile. The first portion of the zero-cranking-power rating is done.
Second Part: The test is performed until the voltage lowers to 5 volts. The second part of the rating is the number of minutes it takes to lower the voltage to 5 V. The battery quality is greater when both numbers are higher.
Cold Cranking Power:
This easy rating applies to all 12-volt storage batteries, regardless of size. At -18°C (0°F), the battery is charged until the overall voltage falls to 7.2 V. For 30 seconds, the output current in amperes is monitored. The better the battery, the higher the output.
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