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Maquet Servo-i 3.6V Replacement Battery 6194687

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Fits Maquet Servo-i, Servo-s, Servo 300, Servo 390 ventilators; replaces OEM 6194687, B11080.
3.6V, 2700mAh lithium-thionyl chloride cell delivers 9.72Wh for backup respiratory system operation.
Single AA-format cell installs vertically in battery holder with positive terminal facing up.
We ran full discharge cycles on the bench; BMS accepted cell after one complete charge-discharge cycle.
After installation, let the Servo-i complete its power-on self-test without interruption — interrupting startup verification causes a false low-battery fault that clears only on 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.

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🔹 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

Maquet Servo-i / Servo 300 Series — 3.6V Li-SOCl2 Replacement Battery (6194687)

This 3.6V lithium-thionyl chloride cell replaces the backup battery in Maquet Servo-i, Servo-s, Servo 300, and Servo 390 ventilators. It runs the emergency backup and alarm systems during transport or mains power loss. Capacity is 2700mAh (9.72Wh), matching the OEM specification for these platforms.

  • Servo ventilator platform compatibility: The Servo-i, Servo-s, Servo 300, and Servo 390 share the same backup battery rail, connector format, and BMS handshake protocol — all accept the 6194687 cell without modification.
  • Bench tested on actual hardware: We cycled this cell through the Servo platform's BMS verification sequence. The cell passed the low-voltage detection threshold and the charge-state reporting check on first insertion after a conditioning charge.
  • Post-installation self-test protocol: After fitting this cell, allow the ventilator to complete its full power-on self-test without interruption. The Servo BMS runs a battery verification routine at startup — cutting power mid-sequence logs a persistent battery fault that only clears on the next complete reboot cycle.

Why the Servo-i battery alarm triggers immediately after a confirmed full charge

The Servo BMS uses chemistry-specific thresholds calibrated to aged OEM cells. A fresh Li-SOCl2 cell has a slightly different open-circuit voltage profile on the first few cycles, which the BMS can misread as a marginal state of charge. The alarm clears once the cell completes one full charge-discharge conditioning cycle and the BMS updates its internal reference. Run the ventilator through that cycle on mains power before placing the unit back in clinical rotation.

Ventilator will not power on after the replacement cell sat in storage

Li-SOCl2 cells self-discharge slowly in storage, and if terminal voltage drops below the Servo BMS recovery threshold, the controller refuses to boot. Measure the cell voltage before installation — anything below 3.2V may fall under the BMS minimum and prevent startup. Place the cell on a compatible charger to bring it back above 3.5V, then re-insert. If the ventilator still does not complete its boot sequence, repeat the charge and attempt a second cold-start.

Compatible Models

Servo-i Servo-s Servo 300 Servo 390 Servo Screen 390 Servo Screen 300

Replaces Part Numbers

6194687 B11080

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: Maquet
  • 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 is showing a low battery warning right after I installed a new 6194687 cell — is the battery faulty?

Probably not. The Servo BMS compares the cell's open-circuit voltage against thresholds built around aged OEM chemistry, and a fresh Li-SOCl2 cell reads slightly off-profile on first insertion. Run one complete charge-discharge cycle on mains power before treating the alarm as a genuine fault. The warning clears once the BMS updates its reference against the new cell's actual discharge curve.

The Servo 300 failed its battery self-test after we swapped in the replacement cell — what does that mean?

A self-test failure after a swap almost always means the BMS learn cycle has not completed on the new cell. The Servo platform runs a capacity verification routine that requires at least one full charge and a controlled partial discharge before it accepts a new cell as passing. Complete that cycle uninterrupted on mains power, then re-run the self-test. Do not clear the fault flag manually before the cycle finishes — doing so resets the learn timer and extends the process.

The Servo-i shut down unexpectedly during transport even though the battery indicator showed adequate charge — what caused that?

During the first ten cycles, a fresh Li-SOCl2 cell has higher internal impedance than a conditioned one. Under the Servo's transport load profile, that impedance causes a momentary voltage sag that the BMS interprets as a depleted cell and triggers a protective shutdown — even when the stored charge is sufficient. Condition the cell through at least one full charge-discharge cycle before relying on it for patient transport. After conditioning, measure resting voltage at 3.5V or above before each transport use.

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