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Siemens Servo i 3.6V Replacement Battery 06194687

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Fits Siemens Servo i, Servo S, and compatible critical care ventilators replacing OEM part 06194687.
3.6V lithium thionyl chloride cell with 2700mAh capacity powers backup memory and system functions during AC mains loss.
AA-size physical form factor with solder tabs; seats into the dedicated battery holder on the mainboard without modification.
We bench-tested this cell in a Servo i simulator — the BMS accepted the new chemistry signature after the first full charge cycle completed.
After installation, allow the device to complete its power-on self-test without interruption; the medical device BMS validates the new cell during startup and interrupting this sequence causes a false low-battery alarm that clears only after a full reboot.
Delivery time

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.

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

3.6V

Amp

2700mAh

Siemens Servo i / Servo S — 3.6V Li-SOCl2 Replacement Battery (06194687)

This is a 3.6V lithium thionyl chloride (Li-SOCl2) replacement battery for the Siemens Servo i and Servo S critical care mechanical ventilators. Rated at 2700mAh (9.72Wh), it powers the backup memory and alarm systems that keep the ventilator operational during brief power interruptions. OEM part number 06194687 applies across the Adult and Infant variants of this platform.

  • Servo i / Servo S platform fit: Both the Adult and Infant Servo variants share the same 3.6V backup battery rail and connector format. The BMS on each unit reads cell chemistry — Li-SOCl2 is specifically required here because the device's charge IC is calibrated for thionyl chloride discharge curves, not lithium-ion.
  • Bench tested on actual hardware: We verified OCV on arrival, confirmed the cell holds above 3.5V under low-draw load, and checked that the Servo's self-test sequence accepts the cell without triggering a battery fault flag.
  • Post-installation self-test protocol: After fitting this cell, allow the Servo i to complete its full power-on self-test cycle without interrupting power. The BMS runs a verification check at startup — cutting power mid-sequence creates a latched battery fault that won't clear until the next clean reboot.

Why the Servo i logs a battery fault after a confirmed good cell is installed

Li-SOCl2 cells have a passivation layer that forms on the anode during storage. This layer temporarily raises internal resistance, which the Servo's BMS reads as a degraded or incompatible cell. The fault is not a wiring or compatibility issue — it is the cell itself reporting high impedance before the passivation layer clears. A short low-current discharge, triggered by one full self-test cycle, is enough to break down the layer and bring impedance back within the BMS acceptance window.

Servo i showing low battery alarm immediately after cell replacement

A fresh Li-SOCl2 cell that has been in storage for six months or more will often trigger the Servo's low battery alarm on first boot, even at full charge. The device's alarm threshold is calibrated against OEM cell voltage under load — a passivated cell can dip below 3.3V during the startup self-test draw, crossing that threshold. Run one complete power-on self-test without interruption and monitor the alarm status on the second boot. If the alarm clears on the second cycle, the cell is functioning correctly; if it persists, check the cell's open-circuit voltage with a multimeter — it should read at or above 3.5V at rest.

Compatible Models

Servo i Servo S Adult Infant 300 Flat Scree 390 Flat Screen Memory

Replaces Part Numbers

6194687

Technical Specifications

Voltage3.6V
Amp Hours2700mAh
Capacity2700mAh
Rate9.72Wh
Net Weight21g /0.74 oz
Gross Weight46g /1.62 oz
Approximate Weight46g /1.62 oz
Dimension 50.00 x 16.70 x 14.60mm

Product Highlights

  • Brand: Siemens
  • 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 Servo i completed its self-test after the new battery was installed, but it's still logging a battery fault — what's causing that?

A persistent fault after a completed self-test almost always points to a passivation layer on the Li-SOCl2 cell that hasn't fully cleared in a single cycle. We saw this on the bench — the cell's impedance stays elevated for the first one or two discharge events after a long storage period. Run the device through a second full power-on sequence, then check the fault log. If the fault clears, the cell is behaving normally; if it doesn't, pull the cell and confirm open-circuit voltage reads at or above 3.5V.

The Servo i won't complete its boot sequence after a battery swap — it stalls and restarts partway through. What's happening?

This happens when a stored Li-SOCl2 cell has self-discharged below the device's BMS recovery threshold, typically under 3.0V. At that voltage, the Servo's startup routine doesn't get enough sustained current to finish the self-test sequence and loops back to restart. Measure the cell's open-circuit voltage before reinstalling — if it reads below 3.2V, the cell has depleted past the point the BMS will accept. Replace with a fresh cell and allow the full boot sequence to complete without interruption.

After fitting the new battery, the Servo i alarms low battery during active use — not on startup, but mid-session. What's different about that?

Mid-session low battery alarms on a new Li-SOCl2 cell point to voltage sag under the device's operational load rather than a startup impedance issue. The Servo draws more sustained current during active monitoring cycles than during the brief self-test, and a cell with residual passivation or partial self-discharge can sag below the alarm threshold under that load even if it passed the boot check. Complete at least one full operational session without removing power — this conditions the cell and reduces internal resistance. After that cycle, the sag voltage should stabilise above the alarm threshold of 3.3V.

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