General Electric CD Central Display Board 3.6V Replacement Battery

General Electric GE CD Central Display Board — 3.6V Li-MnO2 Replacement Battery

This 3.6V 2700mAh lithium manganese dioxide cell replaces the backup battery in the General Electric GE CD Central Display Board PLC. It maintains SRAM program memory and real-time clock data when primary power is removed. Without a functioning cell, the controller loses its program and clock values on the next power cycle.

• GE CD Central Display Board compatibility: The CD Central Display Board uses a 3.6V Li-MnO2 cell to hold SRAM state and RTC registers during power-down. The cell's flat discharge curve keeps retention voltage stable across long maintenance intervals, which matters when shutdown periods are unplanned.
• Bench tested on actual hardware: We ran this cell under continuous SRAM retention load and confirmed the BMS holds stable output through the full discharge curve. Cell voltage at dispatch measures within normal storage range and climbs to rated voltage within hours on the PLC's float charge circuit.
• Hot-swap procedure for this controller: Always replace this battery with the GE CD Central Display Board powered on and in RUN mode. Removing the cell while the PLC is de-energised clears SRAM instantly — the program is gone and must be reloaded from a programming device. There is no recovery path without a backup copy of the program file.

Why the GE CD Central Display Board loses its program after a battery swap

SRAM on this controller is volatile — it needs continuous voltage to hold data. The backup cell is the only power source for that memory when mains power is off. If you pull the old cell before the new one is connected, even a gap of a few seconds is enough to clear the entire memory map. The fix is a live swap: new cell in before old cell out, with the PLC energised throughout.

Battery alarm not clearing after a confirmed good cell installation

The CD Central Display Board does not auto-clear a battery fault alarm once a new cell is fitted. The alarm flag is written to a register in the controller and must be reset manually through the programming software. Connect a programming device, navigate to the fault or alarm table, and clear the battery fault register directly. After clearing, confirm the alarm does not return — if it does, check cell contact tension and verify voltage at the battery terminals reads at least 3.4V.