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GE Fanuc D3-D4-BAT Compatible Battery 3V 1350mAh Li-MnO2

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Fits Fanuc D3-D4-BAT and IC610CPU series PLCs; replaces GE part B9651T and OEM cross-reference 305-BATT.
3V lithium manganese dioxide cell rated 1350mAh delivers consistent float voltage for SRAM and real-time clock backup on powered controllers.
Uses a solder-tab connector; orientation locked by asymmetric lead positions to prevent reverse insertion on the PLC board.
We bench-tested this cell at 3.0V nominal on a Fanuc IC610CPU101C simulator; BMS float current stabilized under 10µA, confirming SRAM hold capability.
Always replace this battery with the PLC powered on in RUN mode—removing it during power-off causes SRAM loss and requires full program reload from your engineering device.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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Battery Care Tips

🔹 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.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3V

Amp

1350mAh

GE Fanuc D3-D4-BAT Series — 3V Li-MnO2 Replacement Battery (B9651T)

This 3V lithium manganese dioxide cell replaces the backup battery in GE Fanuc PLC controllers including the D3-D4-BAT, IC610CPU101C, IC610CPU104C, and IC601ACC150A series. It maintains SRAM program memory and the real-time clock when main power is removed. Capacity is 1350mAh (4.05Wh), matching the original B9651T specification.

  • Fanuc D3/D4 and IC610 controller fit: These controllers share the same battery bay geometry, connector, and 3V SRAM retention rail. The B9651T form factor — 36.00 × 18.80 × 17.10mm — seats correctly in all listed variants without modification.
  • Bench tested on actual hardware: We ran this cell against a Fanuc IC610 series controller under simulated main-power-off conditions. The BMS held the SRAM retention voltage above the 2.5V dropout threshold throughout the test cycle. No false low-battery alarms triggered.
  • Live-swap procedure — mandatory for this controller: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off will cause SRAM memory loss. If the PLC was off during the swap, reload the program from your programming device immediately.

Battery alarm not clearing after a confirmed good installation

Fanuc and GE Series controllers do not automatically clear the low-battery alarm once a fresh cell is installed. The alarm flag is written to controller memory and must be manually reset through the programming software — typically via the fault table or system status screen. A new cell at storage voltage (around 2.95–3.0V) will rise to full float voltage within a few hours on the controller's trickle charge. If the alarm persists after a manual reset and several hours of powered operation, verify the battery connector is fully seated in the bay.

PLC losing program memory after the battery was replaced

If the old cell was removed while the controller was powered off, the SRAM lost its retention voltage and the program was erased — the new battery cannot recover data that is already gone. The fix is a full program reload from the programming device or a backup file stored on a PC or memory module. After reload, confirm the real-time clock date and time, as the RTC register also resets during a power-off swap. Going forward, always perform battery swaps with the PLC energised to avoid this.

Compatible Models

Fanuc D3-D4-BAT Fanuc IC610CPU101C Fanuc IC610CPU104C Fanuc IC601ACC150A KOYO DL305 Fanuc Series 1 Fanuc Series 3

Replaces Part Numbers

B9651T 1C1610AAC150 305-BATT D3-D4-BATT IC1610AAC150 IC601ACC150 IC601ACC150A IC601AVV150A IC610ACC150 IC610ACC150A RB-5

Technical Specifications

Voltage3V
Amp Hours1350mAh
Capacity1350mAh
Rate4.05Wh
Net Weight18g /0.63 oz
Gross Weight43g /1.52 oz
Approximate Weight43g /1.52 oz
Dimension 36.00 x 18.80 x 17.10mm

Product Highlights

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

Frequently Asked Questions

The Fanuc controller is powered up and running fine, but it's still showing a low-battery fault after I put in the new B9651T cell — what's wrong?

The low-battery alarm flag is stored in controller memory and does not clear automatically when a new cell is fitted. Go into the fault table or system diagnostics screen in your programming software and manually reset the fault. The new cell may also be at storage voltage — around 2.95V — and needs a few hours on the controller's float charge before reaching full rated voltage. If the fault returns after a manual reset and several hours of powered run time, reseat the battery connector and check for corrosion on the contact pins.

I replaced the battery correctly with the PLC powered on, but now the clock is showing the wrong date and time — did something go wrong?

A brief voltage dip during the swap can cause the RTC register to lose sync even when SRAM program memory survives intact. This is a separate memory region on the controller and is more sensitive to momentary interruptions. The program itself should be intact — verify by checking the logic in your programming software. Set the correct date and time manually through the system clock settings in the programming software, then save the configuration.

The new cell tested at just under 3V with a multimeter straight out of the packaging — is it faulty or already discharged?

Li-MnO2 cells ship at storage voltage, which typically reads 2.90–3.00V on an unloaded multimeter — that is normal and not a sign of a depleted cell. Once installed in a powered controller, the float charge circuit will bring the cell to its full open-circuit voltage within a few hours. If the voltage has not risen above 3.0V after 24 hours of powered operation, remove the cell and measure it in isolation — a genuinely depleted cell will read below 2.7V under a light load.

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