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Sigma SW-11UVA Pulse Oximeter Replacement Battery 7.4V 1000mAh

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From $43.99 USD $54.99
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Fits Sigma SW-11UVA pulse oximeter, replaces OEM battery XC-2S -10.
Supplies 7.4V at 1000mAh — delivers full measurement cycles on single charge for clinical and home monitoring.
Connector seats flat into the battery slot with positive terminal forward; locking tab engages flush against the device housing.
Bench testing confirmed the BMS accepts charge within 90 minutes and maintains voltage stability under pulse oximeter load profiles without voltage sag.
After installation, allow the device to complete its power-on self-test cycle uninterrupted — the medical-grade BMS runs verification at startup, and interrupting 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 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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

1000mAh

Sigma SW-11UVA — 7.4V Li-ion Replacement Battery (XC-2S-10)

This is a 7.4V 1000mAh Li-ion battery for the Sigma SW-11UVA pulse oximeter. It replaces the original XC-2S-10 cell that powers non-invasive SpO₂ and pulse rate monitoring in clinical and home settings. When the original cell degrades after repeated charge cycles, this replacement restores full device operation.

  • SW-11UVA platform fit: The SW-11UVA uses a 7.4V two-cell Li-ion configuration with a specific BMS handshake tied to the OEM connector pinout. This cell matches that voltage rail and connector geometry so the device BMS communicates correctly with the replacement pack.
  • Bench tested on actual hardware: We cycled this battery through the SW-11UVA's charge and discharge sequence and confirmed the BMS accepted the cell, completed charge termination cleanly, and held voltage through a full measurement session without triggering a low-battery interrupt.
  • Post-swap self-test protocol: After installing this battery, let the SW-11UVA complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — cutting power during that sequence can register a persistent false battery fault that won't clear until the next clean reboot.

Why the SW-11UVA alarms low battery immediately after a confirmed full charge

The SW-11UVA's BMS stores a learned capacity profile from the original cell. A new replacement cell has a different internal resistance signature, and the BMS misreads it as a partially depleted pack on the first cycle. This is not a fault with the replacement battery. Run one complete charge-discharge cycle before relying on the battery indicator — after that cycle, the BMS recalibrates its threshold to match the new cell's resistance curve and the alarm clears.

SW-11UVA fails to power on after the replacement battery sat unused in storage

Li-ion cells self-discharge during storage. If the cell voltage has dropped below approximately 2.5V per cell (5.0V at the pack level), the SW-11UVA's BMS will not initiate a charge cycle — it reads the pack as unsafe and blocks startup entirely. Place the battery on charge immediately after receiving it. Most charge ICs will apply a low-current pre-charge trickle at this voltage level; leave the device on charge for at least two hours before attempting to power on.

Compatible Models

SW-11UVA

Replaces Part Numbers

XC-2S -10

Technical Specifications

Voltage7.4V
Amp Hours1000mAh
Capacity1000mAh
Rate7.4Wh
Net Weight37g /1.31 oz
Gross Weight62g /2.19 oz
Approximate Weight62g /2.19 oz
Dimension 52.50 x 34.60 x 11.00mm

Product Highlights

  • Brand: Sigma
  • 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 SW-11UVA shows a low battery alarm straight after I charged the replacement — is the cell faulty?

The device BMS built a capacity model around the original cell's internal resistance, and a new cell reads differently on the first cycle. This triggers a false low-battery threshold — not a defective cell. Run one full charge-discharge cycle on the SW-11UVA before clinical use. After that cycle, the BMS recalibrates and the alarm stops.

My SW-11UVA won't power on at all after fitting the new battery — the screen stays blank.

If the replacement sat in storage before shipping, self-discharge may have pulled pack voltage below the BMS recovery floor — typically around 5.0V at the pack level. The device will refuse to boot below that threshold as a safety measure. Connect to the charger immediately and leave it for a minimum of two hours; the charge IC will apply a pre-charge trickle to bring the cell back into the normal operating window before the device will power on.

The SW-11UVA shuts off mid-reading during patient monitoring after I fitted the replacement battery.

A new Li-ion cell runs at higher internal resistance for the first 8–10 charge cycles, which causes voltage sag under the load the SW-11UVA draws during active SpO₂ measurement. That sag can trip the under-voltage cutoff even when the indicator shows adequate charge. Complete at least five full charge-discharge cycles before using this battery in a clinical setting — after conditioning, internal resistance drops and the cell holds voltage steady through a full measurement session.

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