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Nellcor N5500 Monitor 14.4V Replacement Battery 110273

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From $113.99 USD $137.99
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Fits Nellcor N5500 and N5600 monitors; replaces OEM part 110273 and 88888813.
14.4V and 3800mAh rating delivers sustained power for portable pulse oximetry monitoring sessions.
Battery slides into the rear compartment with a keyed connector; orientation is marked on the housing.
We bench tested this Ni-MH cell in the N5500 charging cradle; the BMS accepted the charge within protocol and held voltage stable under typical monitor draw.
After installation, allow the device to complete its power-on self-test without interruption — medical devices run BMS verification at startup, and interrupting this sequence causes a false battery fault that persists until the next full reboot.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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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⚠️ 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

14.4V

Amp

3800mAh

Nellcor N5500 / N5600 Monitor — 14.4V Ni-MH Replacement Battery (110273)

This is a 14.4V 3800mAh Ni-MH replacement battery for the Nellcor N5500 and N5600 pulse oximetry monitors. It replaces OEM part numbers 110273 and 88888813. These monitors are clinical-grade devices used for non-invasive SpO2 and pulse rate monitoring in hospital and portable care settings.

  • N5500 and N5600 compatibility: Both monitors share the same 14.4V battery platform, connector pinout, and BMS handshake protocol. A single cell format covers both units without modification.
  • Bench tested on actual hardware: We cycled this battery through the N5500 charge and discharge sequence. The BMS accepted the cell, completed charge termination correctly, and held voltage within spec under the monitor's continuous SpO2 load profile.
  • Post-swap self-test protocol: After installing this battery, allow the N5500 or N5600 to complete its full power-on self-test without interruption. These monitors run a BMS verification routine at startup — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot.

Device not completing boot sequence on new battery

The N5500 runs a startup self-test that includes a battery verification step. If the cell voltage is below the monitor's minimum boot threshold — typically around 12.0V — the device will stall or abort the boot sequence entirely. This can happen with a new Ni-MH cell that has self-discharged in storage. Charge the battery fully before the first installation, then power on and let the self-test run to completion without interruption.

Low battery alarm triggering immediately after a confirmed full charge

The N5500's BMS uses a capacity threshold calibrated to OEM cell characteristics. A new replacement cell may not satisfy that threshold on the first cycle because the BMS has no discharge history to reference. The monitor flags this as a low battery condition even though the cell is fully charged. Run one complete charge-to-discharge-to-charge cycle on the device before clinical use — this gives the BMS enough data to update its internal capacity estimate and clear the alarm.

Compatible Models

N5500 Monitor N5600 Monitor

Replaces Part Numbers

110273 88888813

Technical Specifications

Voltage14.4V
Amp Hours3800mAh
Capacity3800mAh
Rate54.72Wh
Net Weight602g /21.23 oz
Gross Weight672g /23.70 oz
Approximate Weight672g /23.70 oz
Dimension 101.50 x 67.30 x 34.00mm

Product Highlights

  • Brand: Nellcor
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My N5500 just had a fresh battery installed but it's alarming low battery straight away — is the cell faulty?

The cell is almost certainly fine. The N5500's BMS has no discharge history on a new cell, so it applies a conservative threshold on the first cycle and flags anything that doesn't match expected OEM capacity data. Run one full charge-to-full-discharge-to-full-charge cycle through the monitor itself before drawing any conclusions. After that cycle completes, the BMS updates its reference and the alarm clears.

The N5500 shut down mid-use with no warning — battery indicator was showing half charge moments before.

Ni-MH voltage collapses sharply under load once the cell drops past a certain state of charge — the indicator can look healthy right up until cutoff. In the first 10 cycles, new Ni-MH cells are also more susceptible to voltage sag under the continuous draw of a running SpO2 monitor. This is a break-in characteristic, not a defect. Complete several full charge-discharge cycles and the sag reduces as cell capacity stabilises.

The battery sat in the box for a few months before we installed it — now the N5500 won't power on at all.

Ni-MH cells self-discharge in storage, and if voltage drops below the N5500's BMS recovery threshold, the monitor will not attempt a boot. Connect the battery to the charger for a minimum of 2–3 hours before installing it in the device — do not bypass this step even if the charge indicator moves quickly. Once the cell recovers above approximately 12.0V, reinstall it and allow the full power-on self-test to complete before clinical use.

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