FAQ – Best Practice CP1 Battery Replacement

Q: What is Best Practice for replacing CP1 Battery

A: Use the following procedure to replace the battery when the previous battery has become completely discharged. You must complete this procedure within five minutes after turning OFF the power to the CPU Unit to ensure memory backup.

Note 1. We recommend replacing the battery with the power OFF to prevent the CPU Unit’s sensitive internal components from being damaged by static electricity. The battery can be replaced without turning OFF the power supply. To do so, always touch a grounded piece of metal to discharge static

electricity from your body before starting the procedure.

Note 2. After replacing the battery, connect the CX-Programmer and clear the battery error

Procedure

1. Turn OFF the power to the CPU Unit.

or If the CPU Unit has not been ON, turn it ON for at least five minutes and then turn it OFF.

Note If power is not turned ON for at least five minutes before replacing the battery, the capacitor that backs up memory when the battery is removed will not be fully charged and memory may be lost before the new battery is inserted.

2. Open the compartment on the CPU Unit and carefully draw out the battery.

3. Remove the battery connector.

4. Connect the new battery, place it into the compartment, and close the cover.

WARNING Never short-circuit the battery terminals; never charge the battery; never disassemble the battery; and never heat or incinerate the battery. Doing any of these may cause the battery to leak, burn, or rupturing resulting in injury, fire, and possible loss of life or property. Also, never use a battery that has been dropped on the floor or otherwise subject to shock. It may leak.

Caution You must complete this procedure within five minutes after turning OFF the

power to the CPU Unit to ensure memory backup. If the procedure is not completed within 5 minutes, data may be lost.

Caution UL standards require that batteries be replaced by experienced technicians.

Always place an experienced technician in charge or battery replacement.

Caution Turn ON the power after replacing the battery for a CPU Unit that has been

unused for a long time. Leaving the CPU Unit unused again without turning

ON the power even once after the battery is replaced may result in a shorter

battery life.

Note The battery error will automatically be cleared when a new battery is inserted.

Date/Revision History

First review 9/22/2025 V1.0

Author:

Ed Gallagher, Technical Support Engineer

References

Reference page 681 of 830 of

SYSMAC CP Series CP1L CPU Unit OPERATION MANUAL