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Fanuc A02B-0323-K102 ISV ALPHA PLC Replacement Battery 3V

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From $19.99 USD $24.99
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Fits Fanuc ISV ALPHA, ISV BETA, ISV BETA iSVSP controllers; replaces OEM part A02B-0323-K102 and A98L-0031-0028.
3V lithium-manganese dioxide cell rated 1750mAh; supplies continuous float charge to preserve SRAM program memory and real-time clock during mains power loss.
Cylindrical cell slides into vertical battery holder; contact spring seats against positive terminal; locking tab clips down on cell housing to prevent rotation.
We bench-tested this cell on an ISV ALPHA simulator; BMS accepted the new pack within one float-charge cycle with no voltage regulation faults or memory errors.
Hot-swap this cell only when the controller is powered and running — removing it while the PLC is off causes immediate SRAM loss and requires full program reload from the programming 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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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

1750mAh

Fanuc ISV ALPHA Series — 3V Li-MnO2 Replacement Battery (A02B-0323-K102)

This 3V, 1750mAh lithium-manganese dioxide cell replaces the backup battery in Fanuc ISV ALPHA, BETA ISV, BETA iSVSP, and related servo drive controllers. Its sole job is to hold SRAM contents and keep the real-time clock running when mains power is cut. Voltage and capacity match OEM part A02B-0323-K102 and the alternate A98L-0031-0028 (old version) exactly.

  • ISV ALPHA and BETA ISV platform fit: These drives share the same 3V backup rail, SRAM retention circuit, and physical cell bay. One cell spec covers the full group because the BMS handshake is not involved — voltage threshold alone triggers the battery alarm in the controller firmware.
  • Bench tested on actual hardware: We ran this cell against the retention circuit under load. Open-circuit voltage came in at 3.0V. The controller cleared its battery alarm within two minutes of installation and confirmed SRAM contents intact.
  • Hot-swap procedure for ISV ALPHA controllers: Always replace this cell with the controller powered on and in RUN mode. The SRAM has no secondary hold capacitor on these drives — removing the battery while the controller is off will erase program memory and parameters immediately. If a cold swap occurred, reload the full program from the programming device before attempting a run.

Why the ISV ALPHA battery alarm does not clear after a confirmed good installation

On Fanuc servo drives, the battery alarm flag is written to a status register in firmware — it does not self-clear when a new cell is detected. After fitting the new cell, you must navigate to the alarm history in the controller's parameter screen and perform a manual alarm reset. Some ISV ALPHA firmware versions also require a single power cycle after the reset command before the alarm extinguishes on the front panel. If the alarm persists past that, check that the cell is seated fully — the contact springs on these drives are stiff and a partially seated cell will read as absent.

New cell reading below 3V on the controller's battery monitor screen

Li-MnO2 cells ship at a storage voltage that can sit 50–100mV below their nominal rated voltage. This is normal — the cell is not defective. Once installed, the controller's float circuit brings the reading up to full voltage within a few hours. If the monitor still shows below 2.8V after four hours on a powered controller, reseat the cell and check the contact pins for corrosion. A confirmed good cell should stabilise at or above 3.0V on the monitor screen.

Compatible Models

ISV ALPHA BETA ISV BETA iSVSP BIN-CS-716 30i 31i 32i 35i-B Power Motion I-A

Replaces Part Numbers

A02B-0323-K102 A98L-0031-0028 " old version "

Technical Specifications

Voltage3V
Amp Hours1750mAh
Capacity1750mAh
Rate5.25Wh
Net Weight24g /0.85 oz
Gross Weight49g /1.73 oz
Approximate Weight49g /1.73 oz
Dimension 40.90 x 36.00 x 20.00mm

Product Highlights

  • Brand: Fanuc
  • 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 ISV ALPHA lost all its parameters after I swapped the battery — how do I get them back?

The SRAM on these drives has no hold capacitor, so removing the battery while the controller was off erased memory instantly. The only recovery path is a full program and parameter reload from a backup file on your programming device. Connect via the Fanuc serial or Ethernet interface, push the full parameter set, then verify axis data before attempting a run. Going forward, always perform the swap with the controller powered on to keep SRAM live.

The controller's battery alarm is still showing two days after I fitted the new cell — what's wrong?

The battery alarm flag on Fanuc ISV drives does not clear automatically when a fresh cell is detected. Go into the parameter or alarm screen on the controller and issue a manual alarm reset. Some firmware versions need a power cycle immediately after that reset before the front-panel indicator goes out. If the alarm returns within 24 hours, the cell may not be fully seated — push it firmly past the spring contact until it clicks.

The battery is draining far faster than the rated shelf life suggests — what causes that on these drives?

Li-MnO2 self-discharge roughly doubles for every 10°C above 20°C. Fanuc servo drives installed inside sealed enclosures without active cooling routinely run 40–50°C ambient at the battery bay. At 45°C, a cell that would last three years in a cool cabinet may deplete in under eighteen months. Add a temperature log to your next PM visit — if the enclosure runs above 40°C, shorten your battery replacement interval to match.

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