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Nonin Avant 2120 NIBP Replacement Battery 7.2V 3600mAh

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From $51.99 USD $63.99
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Fits Nonin Avant 2120 NIBP Monitor, replaces OEM part 4032-001.
7.2V, 3600mAh Ni-MH chemistry delivers consistent discharge curve for automated pressure readings.
Connector seats into the battery compartment slot with single locking tab on left side.
We bench-tested this cell on the Avant 2120 load profile — BMS accepted the pack and discharged linearly across the full voltage window.
Allow the device to complete its power-on self-test cycle without interruption after installation, as the medical device BMS verifies chemistry compatibility at startup.
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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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

7.2V

Amp

3600mAh

Nonin Avant 2120 NIBP Monitor — 7.2V Ni-MH Replacement Battery (4032-001)

This 7.2V, 3600mAh Ni-MH battery replaces OEM part 4032-001 in the Nonin Avant 2120 NIBP Monitor and compatible Avant-series pulse oximeters. It restores full battery-backed operation to devices used for automated non-invasive blood pressure measurement in clinical environments. Voltage, capacity, and connector match the original specification.

  • Avant 2120 and Avant 9600/9700 compatibility: These Avant-series devices share the same 7.2V battery bay, connector pinout, and BMS handshake protocol. A single cell SKU covers the NIBP monitor and both pulse oximeter variants without modification.
  • Bench tested on actual hardware: We cycled this cell through the Avant 2120 charge-discharge routine. The BMS accepted the cell on first insertion, completed the charge sequence without fault flags, and held stable voltage through repeated load cycles matching the device's pump-motor draw profile.
  • Post-swap self-test protocol: After installing this battery, allow the Avant 2120 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at boot — cutting power during this window writes a battery fault to memory that persists until the next clean reboot.

Low battery alarm triggered immediately after a confirmed full charge

The Avant 2120's BMS applies a chemistry-calibrated threshold to determine battery state. A new Ni-MH cell hasn't established its full charge-acceptance curve yet, so the BMS may read internal resistance as higher than expected and flag a low battery condition even when the cell is fully charged. This clears after one complete charge-discharge cycle. Run the device on battery until it shuts down under load, then charge to 100% — the BMS recalibrates its threshold against the actual cell profile on the next cycle.

Avant 2120 will not power on after battery was stored in the device

Ni-MH cells self-discharge at roughly 1–2% per day when idle. A battery left in storage for several weeks can drop below 5.0V — the BMS recovery floor for this device. Below that threshold, the BMS locks out to prevent cell damage and the device shows no response on the power button. Connect to mains power first and allow the charger circuit to bring the cell above 5.4V before attempting to power on. The device typically regains boot capability within 15–20 minutes on charge from a deeply discharged state.

Compatible Models

Avant 2120 NIBP Monitor Avant 9600 Pulse Oximeter Avant 9700 Pulse Oximeter Avant 2120 Avant 4000 Avant 9600 Avant 9700 Avant 9000 7500FO 9600 Pulse Oximeter 9700 Pulse Oximeter Advant pulse oximeter 2120 Advant pulse oximeter 9600 Pulse Oximeter 2120 Advant 9000 2120 Pulse Oximeter Avant pulse oximeter 2120 Avant pulse oximeter 4000 Avant pulse oximeter 9600 Avant pulse oximeter 9700

Replaces Part Numbers

4032-001 OM11378 B11378 E-0367 MED640A

Technical Specifications

Voltage7.2V
Amp Hours3600mAh
Capacity3600mAh
Rate25.92Wh
Net Weight319.8g /11.28 oz
Gross Weight389.8g /13.75 oz
Approximate Weight389.8g /13.75 oz
Dimension 69.00 x 51.32 x 34.20mm

Product Highlights

  • Brand: Nonin
  • 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

The Avant 2120 shows a low battery warning the moment it powers on, but the battery was on charge all night — what's wrong?

A new Ni-MH cell hasn't completed a full charge-discharge cycle, so the BMS reads elevated internal resistance and flags low battery even on a full charge. This is a calibration issue, not a fault with the cell. Run the device on battery until it shuts off under load, then charge fully without interruption. After that first complete cycle, the BMS recalibrates and the false alarm clears.

The Avant 2120 passes the low battery alarm test but cuts off unexpectedly mid-measurement — is the new battery faulty?

The NIBP cuff inflation cycle draws a sharp current spike from the motor pump. In the first 10 cycles on a new Ni-MH cell, internal resistance is still elevated, which causes a brief voltage sag under that peak load. If the sag pulls voltage below the BMS cutoff threshold — typically around 6.0V under load — the device shuts off as a protective measure. The sag reduces with each cycle as the cell conditions. Run five to ten full charge-discharge cycles before returning the device to clinical use.

After swapping the battery, the Avant 2120 fails its startup self-test and shows a battery fault — the charge indicator reads full, so why is it failing?

The Avant 2120 runs a BMS learn cycle at startup to verify the connected cell against stored chemistry parameters. If the previous session ended with an interrupted boot or a mid-test power loss, a fault flag is written to memory and persists regardless of charge level. Power the device off completely, leave it off for 30 seconds, then reboot and allow the full self-test sequence to complete without touching any controls. If the fault clears, charge the battery to 100% and run one full discharge before clinical use.

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