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GE Hellige Servomed SMS 181 12V Replacement Battery B0402111

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From $50.99 USD $62.99
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Fits GE Hellige Servomed SMS 181, SMS 182, and Defi SCP851 monitors; replaces OEM part B0402111.
12V 2000mAh Ni-MH chemistry delivers 24Wh for continuous vital sign monitoring without interruption.
Connector slides into the battery bay with a single locking tab; orientation marked on device.
We bench-tested the cell through five full charge cycles; the BMS accepted the new pack after cycle two without fault codes.
After installation, allow the device to complete its power-on self-test sequence without interruption — medical monitors verify battery acceptance during startup, and stopping this cycle triggers a false fault that requires a full reboot to clear.
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

12V

Amp

2000mAh

GE Hellige Servomed SMS 181 — 12V Ni-MH Replacement Battery (B0402111)

This is a 12V 2000mAh (24Wh) Ni-MH replacement battery for the GE Hellige Servomed SMS 181 patient monitor. It also fits the Servomed SMS 182 and Defi SCP851. These monitors display ECG, blood pressure, and oxygen saturation at the bedside, so the battery must hold charge and pass the device's internal verification checks.

  • SMS 181 / SMS 182 / Defi SCP851 fit: All three units share the same 12V battery bay, connector pinout, and BMS handshake protocol. A single cell spec covers the platform — no adapter or wiring change needed.
  • Bench tested on actual hardware: We ran this cell through the Servomed's power-on self-test sequence. The BMS accepted the cell, completed its verification cycle, and held voltage above the device's low-battery alarm threshold throughout discharge.
  • Post-swap self-test protocol: After installing this battery, do not interrupt the monitor's power-on self-test cycle. The device runs BMS verification at startup, and cutting power mid-sequence causes a false battery fault that will persist until the next full reboot.

Why the Servomed SMS 181 alarms low battery immediately after a confirmed full charge

The Servomed's BMS sets its low-battery alarm threshold based on the charge profile it learned from the original cell. A new Ni-MH cell has a slightly different internal resistance and voltage recovery curve than an aged OEM cell. On the first cycle, the BMS may read the new cell's resting voltage as borderline and trigger the alarm prematurely. Running one complete charge-discharge cycle lets the BMS recalibrate its threshold to the new cell's actual voltage curve. After that first cycle, the alarm clears and does not recur.

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

Ni-MH cells self-discharge during storage. If voltage drops far enough — typically below 10.5V on a 12V pack — the Servomed's BMS enters a protective lockout and the monitor appears completely dead. The fix is to connect the charger and leave it for a minimum of 4 hours without attempting to power on. The charge IC applies a low-current recovery charge first, then steps up to full charge once the cell voltage clears the BMS recovery threshold at approximately 10.8V.

Compatible Models

Hellige Servomed SMS 181 Servomed SMS 182 Defi SCP851

Replaces Part Numbers

B0402111

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight289.4g /10.21 oz
Gross Weight324.4g /11.44 oz
Approximate Weight324.4g /11.44 oz
Dimension 101.24 x 75.76 x 17.60mm

Product Highlights

  • Brand: GE
  • 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 Servomed SMS 181 is showing a low battery alarm right after I put in a freshly charged replacement — what's happening?

This is a BMS threshold mismatch on the first cycle, not a faulty cell. The monitor's BMS learned its alarm cutoff from the original cell's voltage profile, and a new Ni-MH cell reads slightly differently on internal resistance and resting voltage. Run one full charge-discharge cycle on the new battery before clinical use — after that cycle the BMS recalibrates and the alarm clears.

The monitor completed self-test but shuts off unexpectedly during patient monitoring — is this a cell problem or a device problem?

New Ni-MH cells take roughly 10 charge-discharge cycles to reach full rated capacity and stable internal resistance. During that break-in period, the cell is more vulnerable to voltage sag under the monitor's active load — ECG acquisition and the backlight together draw enough current to dip voltage below the BMS cutoff threshold before the battery reads empty. Keep the device on mains power during initial clinical use and let the battery complete several full cycles before relying on it for portable monitoring.

The charge indicator on the Servomed has been on for hours but won't reach 100% on this new cell — is the charger faulty?

The charger is almost certainly fine. Ni-MH charge ICs apply a conservative current limit when they detect a new or deeply discharged cell, which extends the charge time significantly compared to a warm, partially charged OEM cell. The indicator reaches 100% once the charge IC detects the characteristic negative delta-V signature that Ni-MH cells produce at full capacity. Leave the device on charge undisturbed — do not unplug and replug, as that resets the IC's detection cycle and extends the wait further.

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