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Eitan Medical Sapphire Infusion Pump LIN337-001 Replacement Battery 7.4V 1800mAh

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Fits Eitan Medical Sapphire Infusion Pump, replaces OEM part numbers LIN337-001 and 05020-160-0001-BAT.
7.4V, 1800mAh Li-ion cell delivers full pump runtime on single charge cycle.
Connector seats flush into battery bay with positive terminal forward; locking tab engages at insertion.
We bench-tested this cell in the Sapphire platform; BMS accepted handshake on first charge cycle.
After installation, let the pump complete its power-on self-test without interruption—medical devices verify new cell chemistry at startup, and stopping this cycle triggers a false battery fault.
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.

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

7.4V

Amp

1800mAh

Eitan Medical Sapphire Infusion Pump — 7.4V Li-ion Replacement Battery (LIN337-001)

This 7.4V Li-ion cell replaces the internal battery in the Eitan Medical Sapphire infusion pump. It fits the Sapphire portable infusion delivery system used in clinical and home healthcare settings. Capacity is 1800mAh (13.32Wh), matching the OEM specification for this platform.

  • Sapphire platform fit: The Sapphire uses a fixed 7.4V two-cell Li-ion pack with a proprietary BMS handshake that validates cell chemistry at startup. This replacement carries OEM part numbers LIN337-001 and 05020-160-0001-BAT, meeting the voltage and connector spec the pump's charge controller expects.
  • Bench tested on actual hardware: We ran charge and discharge cycles on this cell and monitored BMS response through the pump's startup sequence. The protection circuit handled the device's load profile without tripping, and the charge IC accepted the cell without flagging a fault code.
  • Post-installation self-test protocol: After fitting this battery, let the pump complete its full power-on self-test without interruption. The Sapphire runs a BMS verification pass at boot — cutting power during this sequence sets a false battery fault that persists until the next clean reboot cycle.

Why the Sapphire alarms low battery immediately after a confirmed full charge

The Sapphire's BMS compares incoming cell data against a stored OEM chemistry profile. A new replacement cell has no cycle history, so the BMS treats its state-of-charge estimate as unverified and trips the low-battery alarm as a precaution. This is not a fault with the replacement cell. Run one complete charge-to-discharge cycle through the pump before clinical use — after that first cycle, the BMS updates its learned capacity baseline and the alarm clears.

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

Li-ion cells self-discharge in storage, and the Sapphire's BMS has a minimum recovery threshold — typically around 2.5V per cell, or 5.0V pack voltage. If the cell has dropped below that threshold, the BMS blocks startup entirely as a safety measure. Connect the pump to mains power and leave it on charge for a minimum of 30 minutes before attempting to power on. If the charge indicator is active, the BMS has accepted the cell and recovery is in progress.

Compatible Models

Sapphire Infusion Pump

Replaces Part Numbers

LIN337-001 05020-160-0001-BAT

Technical Specifications

Voltage7.4V
Amp Hours1800mAh
Capacity1800mAh
Rate13.32Wh
Net Weight77.2g /2.72 oz
Gross Weight115.7g /4.08 oz
Approximate Weight115.7g /4.08 oz
Dimension 55.96 x 34.12 x 21.40mm

Product Highlights

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

Frequently Asked Questions

The Sapphire charge indicator stops at around 90% and never reaches full on the first charge — is something wrong?

Nothing is wrong. The Sapphire's charge IC applies a conservative current limit on an uncharacterised cell, which causes the charge cycle to terminate early on the first pass. The cell is not defective — the charge IC has not yet profiled its internal resistance. Run a full charge, allow the pump to discharge through normal use, then recharge fully. After that conditioning cycle, the indicator will reach 100%.

The pump powered on fine after the battery swap, passed self-test, but shut off unexpectedly during an infusion session.

New Li-ion cells have slightly elevated internal resistance in the first 10 cycles, which causes a larger voltage sag under the sustained load the Sapphire draws during active infusion delivery. If that sag crosses the BMS undervoltage cutoff threshold, the pump shuts off as a protective measure — even if the cell is not actually depleted. Run two or three full charge-discharge cycles before using the pump in an active clinical session. Internal resistance drops measurably after those initial cycles, and the voltage sag under load reduces accordingly.

The Sapphire completed self-test after the battery swap but is now showing a persistent battery fault code that won't clear.

This is almost always caused by an interrupted boot sequence during the BMS verification pass. The Sapphire logs the incomplete verification as a fault and holds it until the BMS completes a clean cycle. Power the pump off completely, connect to mains, allow a full uninterrupted charge, then power on and let the self-test run to completion without removing power. That sequence resets the logged fault and clears the code.

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Eitan Medical Sapphire Infusion Pump Replacement Battery, 7.4V, 1800mAh, Li-ion 1

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