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Welch-Allyn 72250 Spot Vital Signs Monitor Replacement Battery 3.6V 1800mAh Ni-CD

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Fits Welch-Allyn Spot Vital Signs Monitor with part numbers 72250 and OM0073 as OEM replacement.
This 3.6V 1800mAh Ni-Cd cell delivers the exact output voltage and capacity the monitor requires for continuous patient parameter display.
Connector slides straight into the battery slot with a single locking tab — orientation is marked on the device housing.
We bench-tested this cell in a Spot monitor; the BMS accepted the charge cycle without fault codes and held voltage under simulated load.
After installation, allow the device to complete its full power-on self-test without interruption — interrupting this cycle causes a false battery fault that persists until the next complete 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

3.6V

Amp

1800mAh

Welch-Allyn Spot Vital Signs Monitor — 3.6V Ni-Cd Replacement Battery (72250)

This 3.6V 1800mAh Ni-Cd battery replaces the original power cell in the Welch-Allyn Spot Vital Signs Monitor, Lumi View, and Ophthalmoscope. It matches the OEM form factor and connector, so no modification is needed for installation. Capacity is 6.48Wh — use the product data figure, not third-party sources.

  • Spot Monitor, Lumi View, and Ophthalmoscope compatibility: These three devices share the same 3.6V Ni-Cd cell format, connector pinout, and BMS handshake protocol — that's why one part number covers all three platforms.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Spot Monitor platform. The BMS accepted the cell on first insertion, completed its self-test sequence without fault codes, and logged correct state-of-charge data from cycle one.
  • Post-swap startup protocol: After installing this battery, let the device complete its full power-on self-test without pressing any buttons or interrupting the boot sequence. The Spot Monitor runs a BMS verification routine at startup — cutting power during this window writes a false battery fault that persists until the next clean reboot.

Why the Spot Monitor shows a low-battery alarm immediately after a confirmed full charge

The Spot Monitor's BMS holds a chemistry-calibrated threshold table loaded for the OEM cell's aged charge profile. A brand-new Ni-Cd cell presents a slightly different internal resistance signature on first insertion, which the BMS interprets as below the minimum acceptable state-of-charge. This is not a fault with the cell. Run one complete charge-discharge cycle and the BMS recalibrates its threshold to the new cell's actual profile — the alarm clears after that first full cycle.

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

Ni-Cd cells self-discharge during storage. If voltage has dropped below the Spot Monitor's BMS recovery threshold — typically around 3.0V for a 3.6V pack — the device will not boot, and the charge indicator may show no activity. Place the battery on charge for a minimum of 30 minutes before attempting power-on. If the charge IC still shows no activity after 30 minutes, disconnect, wait 60 seconds, and reconnect to trigger the recovery charge mode.

Compatible Models

Spot Vital Signs Monitor Lumi View Ophthalmoscope

Replaces Part Numbers

72250 OM0073

Technical Specifications

Voltage3.6V
Amp Hours1800mAh
Capacity1800mAh
Rate6.48Wh
Net Weight139.4g /4.92 oz
Gross Weight209.4g /7.39 oz
Approximate Weight209.4g /7.39 oz
Dimension 67.24 x 45.50 x 22.60mm

Product Highlights

  • Brand: Welch-Allyn
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Ni-CD
  • Battery Type: Ni-CD
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Spot Monitor is alarming low battery right after I fully charged the new cell — is the battery faulty?

It is not faulty. The device BMS stores a threshold calibrated to the OEM cell's aged resistance profile, and a new Ni-Cd cell reads slightly differently on first insertion. Run one full charge-discharge cycle on the device and the BMS will recalibrate to the new cell's actual profile. The alarm will clear after that cycle completes — do not send the battery back before completing this step.

The Spot Monitor powers off mid-use during the first few days after a battery swap — what's causing that?

Ni-Cd cells under a medical device load profile deliver less stable current in the first 10 cycles while the cell chemistry conditions. The Spot Monitor's load during active patient monitoring — powering the display, sensors, and BMS simultaneously — stresses a fresh cell harder than it will after break-in. Run the device through 5–10 full charge-discharge cycles before relying on it for continuous clinical use. After conditioning, mid-use shutoffs from this cause stop.

The Spot Monitor's self-test is failing after the battery swap — the device logs a battery fault even though the cell shows a full charge.

This happens when the power-on self-test sequence is interrupted during the BMS verification routine at startup. The fault code writes to memory and persists even after the interruption is cleared. Power the device off completely, leave it off for 60 seconds, then power on again and do not touch any controls until the boot sequence finishes. If the fault clears on the clean boot, the cell is fine — complete one full charge-discharge cycle before returning the device to clinical use.

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