Le Blonde A98L-0031-0012 PLC Replacement Battery 3V 2000mAh

Le Blonde 77 CNC Router PLC — 3V Li-MnO2 Replacement Battery (A98L-0031-0012)

This is a 3V, 2000mAh Li-MnO2 cell rated for the Le Blonde 77 CNC router programmable logic controller industrial computer. It powers the SRAM backup and real-time clock circuit inside the PLC. When this cell fails, the controller loses its program memory and clock data on every power cycle.

• 77 CNC router PLC compatibility: The A98L-0031-0012 footprint is specific to this controller's backup circuit. The CR17540SE-RL cell format matches the original connector and board mounting. The BMS handshake on this unit passes a stable 3V rail directly to the SRAM retention circuit without active regulation.
• Bench tested on actual hardware: We ran this cell against the PLC backup circuit and confirmed the BMS holds cutoff voltage above the 2.0V SRAM retention threshold. The cell held load without voltage sag during the memory-hold test cycle.
• Hot-swap requirement on the Le Blonde 77: Never remove this battery with the controller powered off. The SRAM on the 77 PLC has no capacitor buffer — the moment supply drops, stored programs and parameters are gone. Always replace the cell while the PLC is powered and in RUN mode to keep the memory rail live throughout the swap.

Battery alarm not clearing after fitting a new A98L-0031-0012 cell

The Le Blonde 77 PLC does not clear the battery fault alarm automatically when a new cell is installed. The alarm flag is written to a status register in the controller firmware and must be reset manually through the programming software. Connect your programming device, navigate to the diagnostic or alarm log screen, and clear the battery fault bit. If the alarm persists after that reset, check the cell is seated fully and the connector is making contact — a partially seated cell reads as no-voltage to the monitoring circuit.

New cell reading below 3V immediately after installation

Li-MnO2 cells ship in a storage state, typically measuring between 2.7V and 2.85V on arrival. This is normal — it is not a fault with the cell. Once seated in the PLC, the float charge circuit raises the cell back to its nominal 3V within a few hours of the controller running. If the cell still reads below 2.5V after 24 hours on a powered controller, remove it, check the battery connector pins for corrosion, and reseat the cell. A confirmed good installation should measure at or above 2.95V at the terminal.