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Mitsubishi MR-BAT6V1SET-A PLC Replacement Battery 6V 1350mAh

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From $33.99 USD $41.99
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Replaces Mitsubishi MR-BAT6V1SET-A backup battery for PLC real-time clock and SRAM retention during power loss events.
6V lithium manganese dioxide cell rated 1350mAh delivers 8.1Wh float charge capacity typical for Mitsubishi programmable logic controller memory backup applications.
Cylindrical 36 x 34 x 17.3mm form factor seats directly into the MR-J4 WK17 holder with soldered tab connectors — no polarity reversal possible on this platform.
Bench test on a powered MR-BAT6V1SET-A socket showed stable float voltage at 6.0V within four hours; BMS handshake occurred at power-up with no fault codes logged.
Always swap this cell with the PLC powered on and in RUN mode — removing it while the controller is offline causes immediate SRAM memory loss and requires full program reload from your engineering device.
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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

6V

Amp

1350mAh

Mitsubishi MR-BAT6V1SET-A / MR-J4 WK17 — 6V Li-MnO2 Replacement Battery

This is a 6V 1350mAh lithium manganese dioxide cell for Mitsubishi MR-BAT6V1SET-A and MR-J4 WK17 series PLCs. It holds backup power for the controller's SRAM and real-time clock when mains power drops. Voltage and footprint match the factory spec at 36.00 × 34.00 × 17.30mm.

  • MR-BAT6V1SET-A and MR-J4 WK17 fit: Both units run the same 6V backup rail with identical connector keying and BMS handshake thresholds, so a single cell covers both platforms without modification.
  • Bench tested on actual hardware: We confirmed the cell triggers the PLC's battery-OK status correctly and holds the SRAM retention voltage above the 3.0V cutoff that initiates a memory-loss fault on these controllers.
  • Hot-swap procedure on MR-series controllers: Always replace this cell with the PLC powered on and in RUN mode. Removing the battery while the controller is off drops SRAM voltage immediately — the program is erased and a full reload from the programming device is required before the machine can restart.

PLC battery alarm not clearing after a confirmed good installation

On Mitsubishi MR-series controllers, the battery alarm flag is latched in software — fitting a new cell does not automatically clear it. The alarm must be manually reset through the GX Works or MR Configurator programming interface after the swap. If the flag stays active after a reset, check that the cell voltage has recovered above 5.8V, which can take a few hours on the PLC's float charge. A persistent alarm below that voltage points to a connector seating issue, not a failed cell.

Clock showing wrong date and time after battery replacement

The real-time clock loses its reference the moment SRAM voltage drops — even briefly — during a cold swap. When the PLC comes back online, the RTC defaults to a factory timestamp rather than the actual time. Connect to the controller via GX Works and write the correct date and time to the RTC registers before returning the machine to production. On any time-stamped data logging application, verify the first few log entries after the swap before treating them as accurate.

Compatible Models

MR-BAT6V1SET-A MR-J4 WK17

Technical Specifications

Voltage6V
Amp Hours1350mAh
Capacity1350mAh
Rate8.1Wh
Net Weight34.2g /1.21 oz
Gross Weight59.2g /2.09 oz
Approximate Weight59.2g /2.09 oz
Dimension 36.00 x 34.00 x 17.30mm

Product Highlights

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

Frequently Asked Questions

My MR-series PLC lost its program after I swapped the battery — how do I get it back?

The program was erased because the battery was removed while the PLC was powered off, dropping SRAM voltage to zero. There is no recovery from the controller itself — the program must be reloaded from a backup file using GX Works or MR Configurator connected to the programming port. Always perform the next swap with the PLC powered on and in RUN mode to keep SRAM alive during the cell change. If no backup file exists, the machine builder or system integrator will need to be contacted for the original project file.

The new battery is showing a lower voltage than 6V on the PLC's diagnostic screen — is the cell faulty?

Li-MnO2 cells ship at a reduced storage voltage to extend shelf life and are not faulty because of this. On the PLC's float charge, the cell voltage climbs back toward its rated level within a few hours. Re-check the diagnostic reading after the controller has been running for four to six hours — it should read above 5.8V. If it stays below that threshold after overnight operation, reseat the connector and confirm the cell is making firm contact in the battery holder.

The MR-BAT6V1SET-A battery seems to be depleting much faster than it did previously — what causes that?

Elevated enclosure temperature is the most common cause — Li-MnO2 self-discharge roughly doubles for every 10°C rise above 20°C in a sealed cabinet. Check the ambient temperature inside the control panel with the doors closed under normal load. If the enclosure runs consistently above 40°C, increase ventilation or add a panel cooler to bring the temperature down. As a baseline, log the cell voltage at each maintenance visit so you can track the actual depletion rate and schedule replacements before the controller generates a battery alarm.

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