Panasonic BR-CCF2TH 6V PLC Backup Compatible Battery 5000mAh

Panasonic BR-CCF2TH — 6V Li-MnO2 Replacement Battery

This is a 6V lithium-manganese dioxide cell rated at 5000mAh (30Wh), built to the BR-CCF2TH specification. It maintains SRAM program memory and real-time clock functions in PLC and industrial controller systems during mains power loss. Dimensions are 52.00 × 50.50 × 25.00mm — confirm physical fitment against your controller's battery bay before ordering.

• PLC backup battery application: This cell type is widely used across industrial controllers where a dedicated backup cell holds SRAM content and RTC data independently of the main power supply. The BR-CCF2TH form factor and voltage rail match what many Panasonic-sourced controller boards expect at the backup supply pin.
• Bench tested on actual hardware: We confirmed open-circuit voltage on arrival and monitored cell behaviour under a low-current standby load matching typical SRAM retention draw. The cell held above the 5.6V SRAM retention threshold throughout our test cycle.
• Hot-swap procedure — critical for this device class: Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off clears SRAM instantly. If that happens, a full program reload from the programming device is required before the controller will run.

PLC losing program memory after battery swap

SRAM in most PLC controllers is volatile — it needs continuous voltage above a minimum threshold, typically 5.4V to 5.8V depending on the chipset, to retain data. The moment the backup cell is disconnected and the main supply is off, that threshold drops and memory is gone in milliseconds. There is no recovery from inside the controller itself. The only fix is to reload the program from a connected programming device and re-enter any data blocks that were not saved externally.

Battery alarm not clearing after a confirmed good installation

Most PLC platforms do not automatically clear a battery fault alarm when a new cell is installed — the alarm is latched in firmware and needs a manual reset through the programming software or HMI. On many systems the alarm will also persist if the cell voltage on arrival reads slightly below rated, which is normal for Li-MnO2 cells shipped in storage state. Allow the cell to sit on the PLC's float circuit for several hours and then reset the alarm flag in your programming environment. If the alarm returns within 24 hours, measure open-circuit voltage at the battery connector — it should read above 5.8V.