Where to Check the Battery Date?
2 Answers
The production date of the battery is located on the side of the battery. The precautions for battery use are as follows: 1. Charge promptly. The battery begins to sulfate after discharge, and obvious sulfation will occur after 12 hours. Timely charging can remove minor sulfation. If the battery is not used for a long time, it should be fully charged before storage and recharged once every 15 days to a month. 2. Replenish water in time. Electric vehicle batteries are designed with a lean electrolyte system. During the charging process, gas evolution occurs in the battery, causing the distilled water in the electrolyte to gradually decrease. Therefore, check the battery for water shortage every six months or so. If water shortage is found, distilled water should be replenished in time.
I'm quite experienced in checking battery dates! Usually, there's a code consisting of letters and numbers printed on the front or side of the battery. Here's a trick: the first digit represents the last digit of the year, for example, 7 means 2017 or 2027, and the second letter represents the month, with A being January, B being February, and so on up to M for December. For instance, my battery is stamped with 9D15, indicating it was manufactured on April 15, 2019. It's worth noting that different brands have slightly different coding rules. Japanese cars often use a dot matrix marking method, with 6 small dots representing the month and 12 representing the year. When checking, it's best to use a phone flashlight at an angle, as these engravings can easily become blurred in humid environments. I recommend recording the battery date during each maintenance check, especially since batteries older than three years require extra attention to their charging capacity.
