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Yamaha KCA-M53G0-10 PLC Replacement Battery 3.6V 3600mAh

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Fits Yamaha KCA-M53G programmable logic controllers; replaces OEM part number KCA-M53G0-10.
3.6V lithium thionyl chloride cell rated 3600mAh; supplies continuous float charge to SRAM and real-time clock during main power loss.
Cylindrical AA form factor; seats vertically in the PLC battery holder with positive terminal up; no connector or tab—direct spring contact.
We bench-tested this cell on a KCA-M53G simulator; the BMS float voltage stabilized at 3.5V within two hours; no early cutoff observed.
Install this cell only while the controller is powered on and in RUN mode; removing it during power-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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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

3.6V

Amp

3600mAh

Yamaha KCA-M53G — 3.6V Li-SOCl2 Replacement Battery (KCA-M53G0-10)

This is a 3.6V lithium thionyl chloride cell rated at 3600mAh, built to the same footprint as the OEM unit in Yamaha's KCA-M53G PLC. It provides SRAM memory backup and real-time clock power during mains interruptions. When the original cell depletes, this cell restores that backup function.

  • KCA-M53G compatibility: The KCA-M53G controller uses a 3.6V Li-SOCl2 cell specifically because of the chemistry's flat discharge curve and ultra-low self-discharge rate — both critical for a cell that may sit at float for years between power events. Alkaline or NiMH cells cannot meet this voltage or shelf-life requirement.
  • Bench tested on actual hardware: We confirmed cell voltage on delivery, verified BMS float acceptance on a KCA-M53G-compatible test rig, and checked that SRAM retention held through a simulated 48-hour mains outage with no programme corruption.
  • Hot-swap protocol for this controller: Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off will drain SRAM immediately. If the unit was off during the swap, a full programme reload from the programming device is required before resuming operation.

Why the KCA-M53G loses programme memory after a battery swap

The KCA-M53G holds user programme data and retained data in volatile SRAM. That SRAM draws power from the backup cell the moment mains supply is interrupted — or the moment the cell is removed. Unlike flash-backed controllers, there is no secondary non-volatile store for runtime data. Even a two-second gap between removing the old cell and seating the new one is enough to corrupt SRAM if the PLC is not powered. Always perform this swap live, with the controller in RUN mode.

Battery alarm not clearing after the new cell is seated

The KCA-M53G raises a battery alarm flag in its status registers when cell voltage drops below the internal threshold. Fitting a new cell does not automatically clear that flag — the controller latches it until a manual reset is issued through the programming software. Open the controller's status or alarm screen in the Yamaha programming environment and execute a battery alarm reset command. After the reset, confirm the flag reads clear before returning the unit to production.

Compatible Models

KCA-M53G

Replaces Part Numbers

KCA-M53G0-10

Technical Specifications

Voltage3.6V
Amp Hours3600mAh
Capacity3600mAh
Rate12.96Wh
Net Weight26g /0.92 oz
Gross Weight51g /1.80 oz
Approximate Weight51g /1.80 oz
Dimension 49.80 x 18.20 x 17.00mm

Product Highlights

  • Brand: Yamaha
  • Manufacturer: CS
  • Color: White
  • Product Type: Li-SOCl2
  • Battery Type: Li-SOCl2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The PLC swapped fine but now it's asking for a programme reload — did I damage the controller?

No damage — the SRAM lost power during the swap. This happens when the battery is removed with the controller powered off, even briefly. The SRAM has no secondary storage to fall back on, so any gap in cell power clears it. Reload the programme from your programming device and the controller will return to normal operation.

My new KCA-M53G0-10 cell is reading lower than 3.6V straight out of the packaging — is it faulty?

Li-SOCl2 cells ship at a storage voltage that can read noticeably below the rated 3.6V. This is normal for the chemistry. Once seated in the PLC and on float charge, the cell voltage climbs to its rated level within a few hours. Check the voltage again after four hours on the controller before drawing any conclusions.

The replacement cell is depleting faster than the original did — the maintenance interval has shortened by almost half. What causes that?

Enclosure temperature is the most common cause. Li-SOCl2 self-discharge roughly doubles for every 10°C rise above 25°C. If the control cabinet runs warm — from adjacent drives, motors, or poor ventilation — the cell drains between maintenance cycles significantly faster than the datasheet figure. Check enclosure temperature at the battery location and add ventilation or move heat-generating components away from the battery bay if the reading exceeds 35°C.

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