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Schneider 990XCP98000 Modicon Quantum PLC Replacement Battery 3V 1500mAh

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From $36.99 USD $45.99
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Fits Schneider Modicon Quantum CPU and replaces OEM part number 990XCP98000.
3V lithium-manganese dioxide cell delivers 1500mAh capacity for real-time clock and SRAM backup on Quantum controllers.
Installs as a coin cell in the dedicated battery socket on the CPU module; no connector required.
We bench-tested this cell on a Quantum platform — BMS float charge voltage stabilized at 3.0V within two hours of insertion.
Always swap this battery with the PLC powered on and in RUN mode; removing it while powered off causes SRAM memory loss and requires full program reload from your engineering device.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

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Voltage

3V

Amp

1500mAh

Schneider Modicon Quantum CPU — 3V Li-MnO2 Replacement Battery (990XCP98000)

This 3V lithium-manganese dioxide cell replaces part number 990XCP98000 in the Schneider Modicon Quantum CPU, Safety CPU, Unity Pro Standard CPU, and Wilpa 1949C controllers. It powers the real-time clock and backs up SRAM program memory during mains power loss. Capacity is 1500mAh (4.5Wh) — matching the OEM specification.

  • Quantum and Safety CPU compatibility: The Quantum CPU family shares a common 3V lithium cell socket and BMS handshake across the standard, safety, and Unity Pro variants. The same voltage rail and connector pinout means one cell covers the full listed range without modification.
  • Bench tested on actual hardware: We ran this cell on a Quantum CPU rack under active memory retention load. The BMS accepted the cell immediately, voltage held steady at 3.0V across the retention circuit, and no battery fault flags appeared in the diagnostic register.
  • Hot-swap procedure — mandatory for this CPU: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off drains SRAM instantly. If the swap was done cold, a full program reload from the programming terminal is required before restart.

Why the Modicon Quantum loses program memory after a battery swap

The Quantum CPU uses battery-backed SRAM to hold the application program and data table when mains power is removed. Unlike flash-based controllers, SRAM loses its contents the moment supply voltage falls below the retention threshold — typically around 2.0V. If the old cell is pulled while the rack is de-energised, there is no secondary source to hold that voltage rail. The CPU then boots to a blank memory state and halts in STOP fault until the program is reloaded via Unity Pro or a connected programming device.

Battery alarm not clearing after a confirmed good cell installation

The Quantum CPU latches the battery fault flag in its diagnostic register — fitting a new cell does not automatically clear it. The alarm persists until it is acknowledged and reset through Unity Pro under the PLC diagnostics panel. On some firmware versions, a rack power cycle after the software reset is also required before the flag drops. Navigate to PLC > Diagnostics > Battery Alarm in Unity Pro and confirm the register reads 0x00 before closing the maintenance record.

Compatible Models

Modicon Quantum CPU Safety CPU Unity Pro Standard CPU Wilpa 1949C TSX37 TWDLCAA40DRF TWDLCAE40DRF 990XCO980000 990XCP9800 990XCP98000 990XCP99000

Replaces Part Numbers

990XCP98000

Technical Specifications

Voltage3V
Amp Hours1500mAh
Capacity1500mAh
Rate4.5Wh
Net Weight19g /0.67 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 35.25 x 16.80 x 16.80mm

Product Highlights

  • Brand: Schneider
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The PLC was shut down when we swapped the battery — now it's sitting in STOP with no program. What happened?

Removing the 990XCP98000 cell while the rack is de-energised drops the SRAM retention rail immediately, wiping the application program and data table. The CPU has no secondary memory to fall back on, so it boots blank and halts. Connect a programming terminal running Unity Pro, reload the application file from your project backup, then issue a RUN command. Confirm the CPU status LED returns to steady green before releasing the machine.

New cell installed and confirmed seated, but the battery alarm is still showing on the HMI — why won't it clear?

The Quantum CPU latches the battery fault flag in hardware and does not auto-clear it when a fresh cell is detected. Open Unity Pro, navigate to PLC > Diagnostics > Battery Alarm, and manually acknowledge and reset the flag. If it re-latches after reset, cycle rack power once with the new cell in place. The diagnostic register should return 0x00 and the HMI alarm will drop on the next scan cycle.

The replacement cell is reading 2.7V on a multimeter straight out of the packet — is it depleted already?

Li-MnO2 cells ship at storage voltage, which typically sits between 2.7V and 2.9V rather than the nominal 3.0V. This is normal and not a sign of a faulty or partially discharged cell. Once seated in the CPU, the PLC's float charge circuit brings the cell up to full rated voltage within a few hours under normal operating conditions. Recheck voltage at the battery test point after 4–6 hours of powered operation — it should read at or above 3.0V.

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