How long can I stock an unused PCD7.Rxxx accumulator battery for PCD4?

FAQ #101451

 

Here are some results of our investigations about this matter: 

• How to determine the age of your accumulator battery?
  The code of manufacturing date is printed on the bottom of the battery, coded in 3 digits MMY (example 129 for Dec 2009)
• These accumulator batteries have a very long life expectancy at trickle charge, up to 6 years.
  So we deduct, that a long time storage of 5 year is adequate.
• Generally, after long time storage (more than one year at room temperature) up to three full charging cycles may be necessary to obtain full capacity again. Due to the high reserve in capacity it is not absolutely necessary to initiate the first service with the three full cycles to gain the full capacity.
  If you would like to be sure the full capacity is re-gained (after a long time while the accu has been stocked), please execute the following procedure:
  - 1) Charging: Place the accu to the PCD7.Rxxx and plug it into a CPU; Switch the CPU On and keep it under voltage for about 3 days
  - 2) Discharge: Keep the PCD7.Rxxx outside of a PCD, mount an EPROM but set the jumper to the "RAM" position, for 4 to 8 hours
  - 3) Repeat three times step 1) and 2), and end with the charging step