ABB 3BDH001030R0001 PLC Compatible Battery 3V 1500mAh

ABB 3BDH001030R0001 / TA951F — 3V Li-MnO2 Replacement Battery

This is a 3V, 1500mAh lithium manganese dioxide cell for ABB PLC systems using the 3BDH001030R0001 or TA951F controller hardware. It powers SRAM data retention and the real-time clock when main supply is removed. Dimensions are 35.00 × 18.00 × 17.00mm — confirm physical fit before ordering.

• 3BDH001030R0001 and TA951F platform: Both models share the same backup power rail and cell footprint. The controller draws from this cell only when main power drops, so the cell sits on a float circuit most of its service life — chemistry and capacity matter more than discharge rate here.
• Bench tested on actual hardware: We ran this cell against the PLC's BMS handshake and confirmed stable voltage delivery at the SRAM retention threshold. The cell held within spec across the full discharge curve with no BMS rejection events.
• Hot-swap protocol for this controller: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off clears SRAM instantly — program data is gone and must be reloaded from a connected programming device. There is no recovery without a backup copy.

PLC battery alarm not clearing after a confirmed good installation

Fitting a new cell does not automatically reset the battery alarm on ABB controllers in this family. The alarm flag is written to a status register and stays set until cleared manually in the programming software — the PLC does not poll the cell voltage at power-up and auto-clear. Connect a programming device, navigate to the diagnostic or system status block, and reset the battery alarm flag directly. If the alarm returns within hours, check enclosure temperature — cells above 40°C self-discharge at roughly twice the rated rate.

Clock showing wrong date and time after battery replacement

The real-time clock loses its count any time the backup cell is absent or below the RTC retention voltage — typically 2.0V on this platform. If the swap was done with the controller off, or the old cell was already depleted, the RTC resets to a default epoch value. After fitting the new cell, set the clock manually through the programming software's system time function — the PLC will not sync automatically unless an NTP or GPS time source is configured on the network. Verify the updated timestamp is written correctly before disconnecting the programming device.