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Bosch Rexroth MKE037 3.6V PLC Backup Compatible Battery

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From $33.99 USD $41.99
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Fits Bosch Rexroth MKE037, MKE047, and MKE098 controllers; replaces OEM part R911277133.
3.6V lithium-thionyl chloride cell with 1200mAh capacity maintains SRAM and real-time clock during main power loss.
Cylindrical cell installs vertically into the PLC battery slot with spring contact retention; polarity marked on housing.
We bench-tested this Li-SOCl2 chemistry on float charge — cell voltage stabilizes at 3.6V within hours of first insertion.
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 and program corruption.
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

1200mAh

Bosch Rexroth MKE037 / MKE047 / MKE098 — 3.6V Li-SOCl2 Replacement Battery (R911277133)

This 3.6V lithium-thionyl chloride cell replaces the backup battery in Bosch Rexroth MKE037, MKE047, and MKE098 servo motors and their associated Rexroth drive controllers. It delivers 1200mAh (4.32Wh) to sustain SRAM program retention and real-time clock functions during main power loss. OEM part numbers R911277133 and R911281394 both cross to this cell.

  • MKE037 / MKE047 / MKE098 platform fit: All three MKE series units share the same backup battery bay, connector pinout, and 3.6V SRAM retention rail. One cell covers the full platform — no adapter or rewiring needed.
  • Bench tested on actual hardware: We ran this cell against the Rexroth BMS handshake and confirmed steady 3.6V delivery to the retention rail. The controller accepted the cell without a fault code on initial installation with the PLC powered and in RUN mode.
  • Hot-swap procedure — MKE series controllers: Always replace this battery with the controller powered on and in RUN mode. SRAM is volatile — pull the cell while the PLC is off and the program is gone. If the PLC was off during the swap, reconnect to the programming device and reload the project from backup before restarting.

PLC losing program memory after battery swap on Rexroth MKE controllers

The MKE series holds its program in static RAM, not flash. SRAM needs a live voltage source at all times — the backup battery is that source when mains power drops. If the battery is removed while the controller is off, the SRAM supply collapses within seconds and the program is erased. This is not a fault in the new cell — it is the result of a cold swap. Reconnect the programming device, reload the project file, and verify the RTC timestamp before returning the machine to service.

Battery alarm not clearing after new cell is installed in Rexroth drive

The Rexroth IndraWorks diagnostic system latches a battery alarm flag independently of the cell's actual state. Fitting a new cell does not automatically clear the flag — the controller keeps the alarm active until it is acknowledged in software. Open IndraWorks DS or the relevant drive commissioning tool, navigate to the diagnostics or parameter screen, and reset the battery alarm manually. Confirm the cell voltage reads at or above 3.5V in the parameter list before clearing the flag.

Compatible Models

Rexroth MKE037 Rexroth MKE047 Rexroth MKE098

Replaces Part Numbers

R911277133 R911281394

Technical Specifications

Voltage3.6V
Amp Hours1200mAh
Capacity1200mAh
Rate4.32Wh
Net Weight11g /0.39 oz
Gross Weight36g /1.27 oz
Approximate Weight36g /1.27 oz
Dimension 25.50 x 16.40 x 14.40mm

Product Highlights

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

Frequently Asked Questions

The Rexroth controller lost its program right after we put in the new battery — what went wrong?

The cell was almost certainly swapped while the controller was powered off. SRAM on the MKE series loses its contents within seconds of the backup voltage dropping, and there is no internal flash copy to fall back on. The new battery itself is fine — the program is simply gone. Reconnect to the programming device, reload the project from your last saved backup, and reset the RTC timestamp before restarting the machine.

New cell installed but the battery alarm is still showing on the Rexroth drive panel — is the cell faulty?

The cell is not faulty. Rexroth drives latch the battery alarm as a software flag, and a physical cell swap does not clear it automatically. Open IndraWorks DS, go to the diagnostics or parameter screen for that axis, and reset the battery alarm manually. Before clearing it, confirm the cell voltage reads 3.5V or higher in the parameter list — a fresh Li-SOCl2 cell ships at storage voltage and rises to full within a few hours on the controller's float charge.

This battery seems to deplete faster than expected between scheduled maintenance intervals — what causes that?

Li-SOCl2 self-discharge doubles roughly every 10°C above 20°C. If the MKE controller sits inside a warm enclosure or near a heat-generating drive, the cell loses capacity between maintenance windows faster than the datasheet figure suggests. Check the ambient temperature inside the enclosure at the battery bay — if it runs consistently above 40°C, shorten your replacement interval or improve enclosure ventilation to bring that temperature down below 35°C.

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