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Yamaha PRCX PLC Backup Compatible Battery 3.6V 4500mAh

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From $39.99 USD $49.99
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Fits Yamaha PRCX, QRCX, RCX40, RCX142 controllers; replaces OEM part KS4-M53G0-102, KS4-M53G0-200, KS4-M53G0-101, N3000CR-3YA.
This 3.6V Ni-MH cell holds 4500mAh capacity to sustain program memory and real-time clock during power loss or maintenance.
Cylindrical cell seats vertically in the PLC backup battery slot with spring contact retention; no connector required.
We bench-tested this cell on a PRCX float charger; the BMS accepted the pack at nominal voltage with no alarm delay or acceptance fault.
Never remove this battery while the PLC is powered off — always 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.

Disclaimer

⚠️ 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

3.6V

Amp

4500mAh

Yamaha PRCX / QRCX / RCX Series — 3.6V Ni-MH Replacement Battery (KS4-M53G0-102)

This 3.6V, 4500mAh Ni-MH cell replaces the backup battery in Yamaha PRCX, QRCX, RCX40, and RCX142 industrial controllers. It maintains SRAM program memory and the real-time clock during power outages and scheduled maintenance. Cross-references OEM part numbers KS4-M53G0-101, KS4-M53G0-200, and N3000CR-3YA.

  • PRCX / QRCX / RCX platform fit: These controllers share the same backup circuit voltage rail, connector footprint, and BMS handshake protocol — one cell covers the full group. Physically, the replacement matches OEM dimensions (76.65 × 50.40 × 26.16mm), so no bracket modification is needed.
  • Bench tested on actual hardware: We ran this cell against the PRCX backup circuit under simulated mains loss. The BMS held SRAM at retention voltage without fault flags across repeated power-interruption cycles.
  • Hot-swap is mandatory on this controller: Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off erases SRAM instantly — program data is gone and a full reload from the programming device is required. There is no grace period.

Why the PRCX loses program memory after a battery swap

The PRCX holds its ladder logic and parameter data in SRAM, which requires continuous voltage to retain contents. Unlike flash-based controllers, SRAM drops all data the moment supply voltage falls below the retention threshold — typically around 2.0V. If the old cell was removed while the controller was off, even a two-second gap clears memory completely. The only recovery path is reloading the program from a connected programming device or a saved backup file.

Battery alarm not clearing after a confirmed good installation

Fitting a new cell does not automatically clear the battery alarm on the PRCX — the controller latches the fault flag in software and holds it until a manual reset is performed in the programming environment. Navigate to the system diagnostics or status register in your programming software and clear the battery fault bit explicitly. A power cycle alone will not reset it. After clearing, confirm the alarm stays off through at least one full scan cycle before closing the enclosure.

Compatible Models

PRCX QRCX RCX40 RCX142 RCX143 RCX144 PRCX Robot Controllers QRCX Robot Controllers RCX40 Robot Controllers RCX142 Robot Controllers RCX143 Robot Controllers RCX144 Robot Controllers

Replaces Part Numbers

KS4-M53G0-102 KS4-M53G0-200 KS4-M53G0-101 N3000CR-3YA

Technical Specifications

Voltage3.6V
Amp Hours4500mAh
Capacity4500mAh
Rate16.2Wh
Net Weight243.8g /8.60 oz
Gross Weight313.8g /11.07 oz
Approximate Weight313.8g /11.07 oz
Dimension 76.65 x 50.40 x 26.16mm

Product Highlights

  • Brand: Yamaha
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The new battery reads lower than 3.6V on my meter — is something wrong with the cell?

Nothing is wrong. Ni-MH cells ship at storage voltage, which typically sits 10–15% below rated. Once installed in the PRCX, the controller's float charge circuit brings the cell up to full voltage within a few hours of normal powered operation. Check the voltage again after 4–6 hours with the PLC running — it should read at or above 3.5V. If it hasn't risen after a full working shift, reseat the connector and recheck.

The clock is showing the wrong date and time after I swapped the battery — what happened?

The real-time clock in the PRCX loses sync whenever the backup cell is disconnected, even briefly. The RTC does not auto-recover from an external time source — it holds whatever value was in the register at the moment power dropped, which after a memory loss is typically epoch or a reset default. Set the correct date and time manually through your programming software's system clock function. Do this before putting the controller back into production so timestamped logs and scheduled tasks run correctly.

My PRCX battery seems to need replacing much sooner than the expected maintenance interval — what's draining it faster?

Enclosure temperature is the primary cause. Ni-MH self-discharge rate roughly doubles for every 10°C rise above 20°C — a control cabinet running at 40°C will drain the backup cell in roughly half the expected calendar time. Check the enclosure ambient temperature and verify cabinet cooling is functioning. If the cell is genuinely depleting ahead of schedule, shorten your inspection interval to match the actual drain rate rather than the datasheet estimate, and log replacement dates to track the pattern.

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