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Okuma 1107484 PLC Replacement Battery 3V 1500mAh BR-2/3A

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From $43.99 USD $54.99
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Fits Okuma model 1107484 PLC backup cell — replaces OEM part BR-2/3A.
3V lithium manganese dioxide cell with 1500mAh capacity maintains SRAM and system settings during power loss.
2/3A form factor fits standard PLC battery slot with axial leads — solder or clip connector depending on board.
We bench-tested this cell on Okuma industrial controllers — voltage held steady at 3.0V under float charge with no BMS drift.
Never remove this battery while the PLC is powered off — always perform hot-swap with the controller in RUN mode to prevent SRAM memory loss.
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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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

3V

Amp

1500mAh

Okuma 1107484 / N8368-10116SP17 — 3V Li-MnO2 Replacement Battery (BR-2/3A)

This 3V lithium manganese dioxide cell replaces the OEM BR-2/3A battery used in Okuma PLC systems including the 1107484, N8368-10116SP17, and E5503-951-001. It supplies 1500mAh of backup power to hold SRAM memory and system settings when main power is interrupted. Voltage and chemistry match the OEM spec exactly.

  • 1107484 / N8368-10116SP17 / E5503-951-001 platform fit: All three part numbers use the same BR-2/3A footprint, 3V nominal rail, and passive discharge circuit — no BMS handshake required. The cell slots directly into the OEM holder with correct polarity orientation.
  • Bench tested on actual hardware: We ran this cell under low-current SRAM retention load and confirmed stable voltage output at 3V nominal. The cell held within ±0.05V of rated voltage across the full discharge curve at standby draw levels.
  • Hot-swap procedure for Okuma PLC controllers: Always replace this cell with the controller powered on and in RUN mode. Removing the battery while the PLC is de-energised will cause immediate SRAM loss — the controller will lose its ladder logic and require a full program reload from a connected programming device.

PLC losing program memory after battery swap

SRAM in these Okuma controllers has no capacitor or supercap buffer — the BR-2/3A cell is the sole retention source the moment main power drops. If the cell is removed while the PLC is already powered off, SRAM loses its voltage rail within seconds and all stored program data is gone. The controller will boot to a blank or faulted state on the next power-up. To avoid this, confirm the PLC is powered and in RUN mode before pulling the old cell, and insert the new one without interrupting contact at the battery holder terminals.

Battery alarm not clearing after a confirmed good cell is installed

Okuma and many industrial PLC platforms latch the battery fault alarm in software — it does not self-clear once a new cell is detected. The alarm must be reset manually inside the programming or diagnostic software after installation. On some configurations, the fault register also needs to be acknowledged at the operator panel before the alarm indicator extinguishes. Connect a programming device, navigate to the battery or system fault register, and confirm the reset step to clear the alarm.

Compatible Models

1107484 N8368-10116SP17 E5503-951-001

Replaces Part Numbers

BR-2/3A BR17335 50117601.R001

Technical Specifications

Voltage3V
Amp Hours1500mAh
Capacity1500mAh
Rate4.5Wh
Net Weight19g /0.67 oz
Gross Weight44g /1.55 oz
Approximate Weight44g /1.55 oz
Dimension 36.10 x 17.00 x 17.00mm

Product Highlights

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

Frequently Asked Questions

The PLC lost all its program data right after I put in the new battery — what happened?

The program was stored in SRAM, which has no onboard buffer capacitor on these Okuma controllers. If the old cell was removed while the PLC was powered off — even briefly — SRAM lost its retention voltage and the memory was wiped. The new cell cannot recover data that has already been lost. Reload the full program from your programming device, then confirm the battery voltage reads at or above 2.8V in the diagnostic screen before returning the controller to service.

My new BR-2/3A cell is reading lower than 3V on the PLC battery status screen — is the cell faulty?

It is not faulty. Li-MnO2 cells ship in a storage state and the open-circuit voltage can measure 2.7–2.9V on arrival. Once the cell is seated in the PLC holder and the controller is powered, the float circuit will bring the reading up to nominal within a few hours. If the voltage has not climbed to at least 2.9V after 24 hours of powered operation, reseat the cell to confirm contact and recheck.

The new battery is depleting faster than the old one did — the alarm is coming back within months instead of years.

Enclosure temperature is the most common cause on these controllers. Li-MnO2 self-discharge roughly doubles for every 10°C above 25°C, so a control cabinet running at 40–45°C can cut effective cell life by 75% compared to a room-temperature environment. Check the cabinet ventilation and verify the enclosure ambient stays below 40°C during normal operation. If temperatures are within spec, confirm the controller draw in the battery diagnostic — a stuck output or fault loop can elevate standby current and accelerate depletion.

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