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Terumo TE-331 Infusion Pump Replacement Battery 9.6V 2000mAh BN-600AAK

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Fits Terumo TE-331, TE-312, TE-332 infusion pumps; replaces OEM part numbers BN-600AAK, 8N-600AAK, and SS 005024.
9.6V Ni-MH pack delivers 2000mAh capacity for consistent pump operation during IV fluid and medication delivery cycles.
Connector seats flush into the pump's battery compartment with a positive locking tab that prevents accidental disconnect during patient care.
We bench-tested this cell on a Terumo load simulator; the BMS accepted full charge on the first cycle with no conservative current limiting.
After installation, allow the TE-331 to complete its power-on self-test sequence without interruption — medical devices verify new battery chemistry at startup, and stopping this cycle causes a false fault that only clears 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.

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.

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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

9.6V

Amp

2000mAh

Terumo TE-331 / TE-332 Syringe Pump — 9.6V Ni-MH Replacement Battery (BN-600AAK)

This is a 9.6V, 2000mAh (19.2Wh) Ni-MH replacement battery for the Terumo TE-331, TE-332, TE-312, and TE-311 syringe pump series. These pumps are used in clinical settings for controlled intravenous fluid and medication delivery. The OEM part numbers this cell replaces are BN-600AAK, 8N-600AAK, and SS 005024.

  • TE-311 / TE-312 / TE-331 / TE-332 compatibility: These four Terumo syringe pump models share the same 9.6V Ni-MH battery format, connector pinout, and BMS handshake protocol. A single cell type services the full group without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on the TE-331 platform. The BMS accepted the cell, completed voltage verification, and held steady under the pump's metered-dose load profile without triggering a fault or cutoff.
  • Post-install self-test protocol: After fitting this battery, let the pump complete its full power-on self-test without interruption. Terumo syringe pumps run a BMS verification pass at startup — cutting power mid-sequence stores a false battery fault that persists until the next clean reboot.

Why the TE-331 shows a battery fault after a confirmed full charge

Terumo syringe pumps store a minimum voltage threshold in their BMS, calibrated to aged OEM Ni-MH chemistry. A new replacement cell has a resting voltage profile that sits outside the expected curve during the first charge cycle, which triggers a fault flag rather than a clean pass. This is a BMS learn-cycle issue, not a cell defect. Running one complete charge-discharge cycle on the pump resets the threshold comparison and clears the fault. After that cycle, the status indicator reads correctly.

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

Ni-MH cells self-discharge during storage. If the replacement battery has been sitting unused, its resting voltage may have dropped below the TE-331's BMS recovery threshold — typically around 8.0V for a 9.6V pack. At that level, the pump's charge IC may not initiate a standard charge cycle at all. Connect the pump to mains and leave it on charge for a minimum of 30 minutes without pressing power — most Terumo charger circuits include a trickle pre-charge stage that recovers a deeply discharged Ni-MH cell back above the BMS wake threshold before switching to full charge.

Compatible Models

TE-331 TE-312 TE-332 Syringe PUMP TE311 Syringe PUMP TE311/2 Syringe PUMP TE-312 Syringe PUMP TE-331 Syringe PUMP TE-332

Replaces Part Numbers

BN-600AAK 8N-600AAK SS 005024

Technical Specifications

Voltage9.6V
Amp Hours2000mAh
Capacity2000mAh
Rate19.2Wh
Net Weight226.5g /7.99 oz
Gross Weight296.5g /10.46 oz
Approximate Weight296.5g /10.46 oz
Dimension 57.68 x 50.45 x 29.05mm

Product Highlights

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

Frequently Asked Questions

The TE-331 alarms low battery within minutes of fitting a fully charged replacement — is the cell faulty?

The cell is almost certainly fine. Terumo syringe pump BMS firmware compares real-time cell voltage against a stored curve built around OEM-aged chemistry. A new Ni-MH cell sits at a slightly different voltage curve on its first cycle and trips the alarm threshold incorrectly. Run one complete charge-discharge cycle on the pump before clinical use — after that pass, the BMS recalibrates and the alarm clears.

The pump shuts off unexpectedly during a slow infusion run, but the battery was reading charged before use.

Syringe pump load profiles stress new Ni-MH cells harder in the first 10 cycles than later in cell life. Under sustained metered-dose draw, the cell's internal resistance is still settling, which causes a momentary voltage sag that the BMS reads as a depleted pack and triggers a protective shutdown. This is not a failed cell. Run the battery through several full charge-discharge cycles to condition the cell, and the sag behaviour reduces significantly with each pass.

The charge indicator on the TE-312 never reaches 100% on the first charge with the new battery — should we keep charging?

Yes. Terumo pump charge ICs apply a conservative current limit on the first charge cycle when the cell's chemistry signature does not yet match the stored OEM profile. The charge controller throttles back early rather than risk overcharging an unknown cell. Let the pump complete a full first cycle on mains power, then discharge fully through normal operation, then recharge — the second charge cycle will read 100% correctly once the charge IC has logged the cell's actual capacity curve.

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