How can the age and condition of a sealed rechargeable battery be determined?

Look for a stamp on top of the battery. The stamp should be in a date format of YYMMDDXX where:

  • YY is the year.
  • MM is the month.
  • DD is the day.
  • XX is the manufacturing plant.

This indicates the age of the battery.

To evaluate the condition of the battery:

  1. Charge the battery.
  2. Let the battery sit for a couple of hours.
  3. Measure the open circuit voltage to get an estimated indication of condition.

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