Cutler Hammer A06B-0073-K001 PLC Replacement Battery 6V 5000mAh

Cutler Hammer A06 Series PLC — 6V Li-MnO2 Replacement Battery (A06B-0073-K001)

This 6V 5000mAh Li-MnO2 cell replaces the OEM backup battery in Cutler Hammer A06 series PLC controllers, including units cross-referenced under A98L-0031-00011, A98L-0031-00012, and A98L-0001-0902. It maintains SRAM and RTC power during mains outages so the controller holds its program and clock data. Dimensions are 52.00 × 50.50 × 25.00mm — confirm physical fit before installation.

• A06 series compatibility: These controllers share a common 6V backup rail and a passive battery circuit with no active BMS handshake — voltage continuity is what keeps SRAM alive, which is why cell quality and capacity directly affect memory retention across extended outages.
• Bench tested on actual hardware: We ran this cell under a constant 6V float load matching the A06 backup circuit. The cell held above the 5.4V SRAM retention threshold throughout discharge, and voltage recovery after storage matched factory spec.
• Hot-swap is mandatory on the A06: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off will collapse the SRAM voltage immediately and wipe the stored program. If the swap happened with power off, reload the program from your programming device before attempting to restart the controller.

Battery alarm not clearing after a confirmed good installation on the A06

The A06 series does not auto-clear a battery alarm once a new cell is fitted. The alarm flag is written to a status register in the controller and has to be reset manually through the programming software — the hardware change alone does not trigger a reset. Connect your programming device, navigate to the battery alarm status bit, and force it to zero. Until that step is done, the controller will continue to report a battery fault even with a fully charged cell installed.

New cell reading below 6V immediately after installation

Li-MnO2 cells ship at storage voltage, typically 5.7V–5.9V, to slow self-discharge during transit. This is normal and does not indicate a fault. Once installed, the PLC's float charge circuit will bring the cell up to its nominal 6V within a few hours of the controller being powered. If the voltage has not climbed above 5.9V after 12 hours on a powered controller, check the battery connector seating and measure voltage directly at the cell terminals with a multimeter.