What is a battery date code chart?

The battery date code chart is a tool that allows you to determine the date of manufacture for a given battery. The date code is typically stamped on the battery itself, and can be used to determine the age of the battery.

How do you know if a lead battery has an expiration date?

Lead batteries often have a date printed or engraved in the plastic, with the notation being either MM/yy or AA/MM depending on the brand and model. There is a date, but it doesn't indicate an expiration date for lead batteries. Self-discharge is important for lead batteries, and it depends on the temperature and place of storage.

How do you know if a battery has a date code?

In most cases, battery manufacturers stamp or etch a date code on the battery, indicating the month, year, and location of manufacture. Reading the Date Code U.S. Battery uses a stamped code on the terminals of its flooded lead-acid batteries.

How do you test a lead acid battery?

If the specific gravity readings show a spread greater than .030 (30 points), give the batteries an equalization charge and re-test. The state of charge of a lead acid battery is most accurately determined by measuring the specific gravity of the electrolyte.

Does a battery have a manufacture date?

Yes, there is a manufacture date on batteries. The date is stamped on the top of the battery and is almost always the first number and first letter. The first number is the month and the letter is the year. For example, if the code is 3L, the battery was made in March of 2013. If the code is 11J, the battery was made in November of 2010.

When should a lead acid battery be equalized?

Equalization should be performed when individual battery voltages in a battery pack range greater than 0.15 volts for 6-volt batteries or 0.30 volts for 12-volt batteries. Lead acid batteries do not develop any type of memory. This means that you do not have to deep discharge or completely discharge a battery before recharging it.