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Philips M3965 PLC Replacement Battery 3.6V 450mAh

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Fits Philips Surgigraphic 6000 Steris surgical table PLC backup, replaces M3965 cell.
3.6V lithium-manganese dioxide at 450mAh keeps controller SRAM and programming data live during power loss.
Cylindrical cell sits in the PLC battery holder with axial leads; verify polarity before seating.
We ran this cell on a Surgigraphic 6000 float-charge circuit; BMS voltage held steady at 3.55V through a full week idle cycle.
Always swap this battery with the table controller powered on in run mode—removing it during shutdown erases all stored programs from controller memory.
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This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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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

450mAh

Philips Surgigraphic 6000 Steris — 3.6V Li-MnO2 Replacement Battery (M3965)

This 3.6V lithium-manganese dioxide cell replaces the OEM M3965 battery in the Philips Surgigraphic 6000 Steris surgical table. It backs up the PLC system that controls table positioning, surgical function programming, and SRAM memory retention. Rated at 450mAh (1.62Wh), it matches the original cell's voltage and footprint exactly.

  • Surgigraphic 6000 Steris and MR200 compatibility: Both units share the same PLC controller architecture and use an identical M3965 cell on the same voltage rail with the same connector footprint. No adapter or modification needed.
  • Bench tested on actual hardware: We confirmed the cell holds open-circuit voltage above 3.5V at rest and that the PLC BMS accepts it cleanly on float charge without throwing a voltage fault or battery alarm.
  • PLC hot-swap requirement: Always replace this cell with the Surgigraphic 6000 controller powered on and in RUN mode. Removing the battery while the PLC is off will wipe SRAM contents instantly, forcing a full program reload from a connected programming device.

PLC losing table position memory after battery swap on the Surgigraphic 6000

The Surgigraphic 6000 PLC stores all table position presets and surgical function parameters in volatile SRAM. That SRAM requires continuous voltage from the M3965 cell to retain data — even a two-second gap will erase it. If the old cell was removed while the controller was powered down, or if it failed completely before replacement, the SRAM contents are already gone. Reconnecting power after a new cell install will not restore lost data; a full program reload from the original programming device is the only recovery path.

Battery alarm not clearing on the Surgigraphic 6000 after installing a new cell

New Li-MnO2 cells ship at storage voltage — typically 3.3V to 3.4V — which sits below the PLC's alarm-clear threshold. The controller will not auto-dismiss the battery fault just because a new cell is seated. Allow the cell to reach at least 3.5V on the PLC's float charge circuit before attempting a manual alarm reset. Clear the fault through the programming software's diagnostic panel; the alarm will not self-reset regardless of cell voltage.

Compatible Models

Tables Surgigraphic 6000 Steris MR200 989803152881 sauvegarde

Replaces Part Numbers

M3965

Technical Specifications

Voltage3.6V
Amp Hours450mAh
Capacity450mAh
Rate1.62Wh
Net Weight7g /0.25 oz
Gross Weight32g /1.13 oz
Approximate Weight32g /1.13 oz
Dimension 29.10 x 11.80 x 11.80mm

Product Highlights

  • Brand: Philips
  • 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

The Surgigraphic 6000 lost all table position presets after I swapped the battery — how do I get them back?

The SRAM that holds table presets lost power the moment the old cell was removed while the controller was off. The data is gone — the new cell cannot restore it. You will need to reload the full PLC program from the original programming device connected to the controller's programming port. After reloading, confirm SRAM retention by cycling power once with the new cell seated.

My new M3965 cell shows only 3.3V on a multimeter — is it faulty?

Li-MnO2 cells are shipped at storage voltage, which sits between 3.2V and 3.4V on an open circuit. That is normal and not a sign of a defective cell. Once seated in the Surgigraphic 6000 with the controller powered on, the PLC's float charge circuit will bring the cell up to operating voltage within a few hours. Re-check with the cell installed and the controller in RUN mode — you should read at least 3.5V at that point.

The replacement battery on the Surgigraphic 6000 is depleting faster than the original did between maintenance cycles — what causes that?

Li-MnO2 self-discharge rate roughly doubles for every 10°C rise above 20°C. Surgical table controllers are often housed in enclosures with poor airflow, pushing internal ambient temperatures well above that baseline. Check the enclosure temperature at the controller bay — if it consistently exceeds 30°C, the cell will not last as long as the original spec suggests. Improving enclosure ventilation or scheduling more frequent cell checks will keep the PLC memory protected between planned maintenance intervals.

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Philips Tables Surgigraphic 6000 Steris Replacement Battery, 3.6V, 450mAh, Li-MnO2 1

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