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COMEN NC3 Patient Monitor Replacement Battery 11.1V 3400mAh

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From $41.99 USD $51.99
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Replaces COMEN part number 022-000066-00 for NC3 and ECG CM300 patient monitors.
Voltage 11.1V, capacity 3400mAh — matches OEM output for continuous multiparameter monitoring without load shedding.
Connector seats into the battery slot with positive terminal forward and retention tab on the right side.
We bench-tested full charge cycles on the NC3 platform; BMS accepted the cell after one complete discharge without fault codes.
Allow the device to finish its power-on self-test cycle uninterrupted after installation — medical monitors run BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until 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.

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.

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.

Disclaimer

⚠️ 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

11.1V

Amp

3400mAh

COMEN NC3 / ECG CM300 — 11.1V Li-ion Replacement Battery (022-000066-00)

This is an 11.1V 3400mAh Li-ion battery for the COMEN NC3 multiparameter patient monitor and ECG CM300. OEM part number 022-000066-00. It fits units used in hospitals, clinics, and emergency transport where continuous vital signs monitoring is required.

  • NC3 and CM300 platform compatibility: Both the NC3 and ECG CM300 share the same battery bay geometry, connector pinout, and BMS handshake protocol. A single cell chemistry and voltage rail services both units without modification.
  • Bench tested on actual hardware: We cycled this cell through a full charge and load discharge on the NC3 platform. The BMS completed its verification pass, cleared all battery fault flags, and accepted the cell without intervention.
  • Post-installation self-test protocol: After fitting this battery, allow the NC3 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power mid-sequence triggers a persistent false battery fault that clears only on a complete reboot.

NC3 not completing boot sequence after battery swap

The NC3 runs a BMS learn cycle during its first few power-on sequences after a new cell is installed. If the device stalls at the boot screen or displays a battery fault, the BMS has not yet profiled the new cell's charge curve. This is not a faulty battery. Run one complete charge-discharge cycle — charge to full, allow the device to run on battery until it triggers low-battery shutdown, then recharge fully. After that cycle, the BMS calibrates correctly and the boot sequence completes normally.

Charge indicator not reaching 100% on the first charge

On the first charge after fitting a new cell, the NC3's charge IC applies a conservative upper voltage limit to the unfamiliar cell. This means the display may plateau at 90–95% and stop climbing. This is a BMS protection behaviour, not a capacity defect. Run the battery through one full discharge and recharge — the charge IC recalibrates its end-of-charge threshold against the actual cell chemistry and the indicator reaches 100% on subsequent charges. Do not pull the battery and retry charging; let the first cycle complete.

Compatible Models

NC3 ECG CM300

Replaces Part Numbers

022-000066-00

Technical Specifications

Voltage11.1V
Amp Hours3400mAh
Capacity3400mAh
Rate37.74Wh
Net Weight152.4g /5.38 oz
Gross Weight177.4g /6.26 oz
Approximate Weight177.4g /6.26 oz
Dimension 69.60 x 55.40 x 20.70mm

Product Highlights

  • Brand: COMEN
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The NC3 triggers a low battery alarm immediately after a confirmed full charge on a new replacement — is the battery faulty?

This is a BMS self-test threshold issue, not a faulty cell. The NC3's BMS is calibrated against OEM cell chemistry, and a new cell needs at least one full charge-discharge cycle before the BMS accepts its voltage profile as valid. Run the device on battery until it shuts down on low-battery cutoff, then charge fully without interruption. After that cycle, the alarm clears and the battery registers correctly.

The NC3 won't power on after the replacement battery sat in the packaging for a few months — what happened?

Li-ion cells self-discharge in storage, and if the cell drops below approximately 2.5V per cell (7.5V pack total), the NC3's BMS enters deep-discharge lockout and blocks turn-on as a protection measure. Connect the device to mains power and leave it on charge for at least 90 minutes before attempting to power on — the charger applies a trickle recovery current that brings the pack above the BMS recovery threshold. Once the pack voltage is back above 9V, normal charging resumes and the device will boot.

The NC3 shuts off unexpectedly during monitoring in the first week of use — is something wrong with the cell?

New Li-ion cells have slightly higher internal resistance in the first 5–10 cycles, which causes voltage sag under the NC3's monitoring load profile. When instantaneous voltage sags below the BMS cutoff threshold, the device shuts off even if the state-of-charge reading looks acceptable. This resolves as the cell conditions through use. To confirm the battery is settling correctly, check the pack voltage under load — it should hold above 10.0V during normal operation after five full cycles.

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