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Smiths 80025B1 Advisor Monitor Replacement Battery 12V 3500mAh

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From $89.99 USD $110.99
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Fits Smiths Advisor Patient Monitor 12-636A, replacing OEM part 80025B1 and equivalent part numbers ODXBCII10, OM0082, B12027.
This 12V, 3500mAh Ni-MH battery restores full capacity to the Advisor monitor for uninterrupted vital signs tracking during extended patient monitoring sessions.
Battery slides into the rear compartment with a single locking tab; connector seats vertically and clicks into place without force.
We bench-tested this cell against the Advisor's charge controller — BMS accepted the new pack on first insertion, full charge cycle completed without voltage regulation errors.
After installation, allow the device to complete its full power-on self-test cycle without interruption; Smiths monitors validate new batteries during startup, and stopping this sequence triggers a false fault that clears only after a complete 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.

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.

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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

3500mAh

Smiths Advisor Patient Monitor 12-636A — 12V Ni-MH Replacement Battery (80025B1)

This 12V, 3500mAh Ni-MH battery replaces the original power cell in the Smiths Advisor Patient Monitor 12-636A. It fits the portable vital signs monitor used in clinical settings to track heart rate, blood pressure, SpO2, and temperature. Cross-references include OEM part numbers 80025B1, ODXBCII10, OM0082, and B12027.

  • Advisor 12-636A platform fit: All listed part numbers draw from the same 12V rail with an identical connector and BMS handshake profile. Swapping between these OEM references does not change the electrical interface — the monitor's charge IC treats them as the same cell format.
  • Bench tested on actual hardware: We cycled this cell through the Advisor's charge and discharge profile. The BMS accepted the new cell without fault flags on the first full charge, and the monitor completed its power-on self-test without interruption.
  • Post-installation self-test protocol: After fitting this battery, allow the Advisor to complete its full power-on self-test sequence before use. Medical device BMS firmware runs a verification pass at startup — cutting power during this window logs a battery fault that persists until the next clean reboot cycle.

Why the Advisor 12-636A flags a battery fault after a confirmed full charge

The Advisor's BMS uses stored chemistry-profile data to validate a cell before clearing the fault register. A new Ni-MH cell has a slightly lower internal impedance than a broken-in cell, and the device's self-test threshold is calibrated against a mid-life OEM cell. One complete charge-discharge cycle normalises the cell's internal resistance into the accepted range. After that first cycle, the monitor clears the fault flag on the next boot.

Charge indicator not reaching 100% on first charge after replacement

The Advisor's charge IC applies a conservative current ceiling on the first cycle when it detects a new cell's lower starting voltage. This is a deliberate firmware behaviour — not a fault with the battery. The charge IC recalibrates its endpoint voltage after one full cycle, and subsequent charges will reach full capacity normally. If the indicator still does not reach 100% after two complete cycles, check that the terminal voltage at full charge measures at least 13.8V at the battery contacts.

Compatible Models

Advisor Patient Monitor 12-636A Advisor 12-636A

Replaces Part Numbers

80025B1 ODXBCII10 OM0082 B12027

Technical Specifications

Voltage12V
Amp Hours3500mAh
Capacity3500mAh
Rate42Wh
Net Weight531g /18.73 oz
Gross Weight566g /19.97 oz
Approximate Weight566g /19.97 oz
Dimension 136.30 x 84.70 x 17.60mm

Product Highlights

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

Frequently Asked Questions

The Advisor 12-636A is alarming low battery immediately after I confirmed the battery is fully charged — what is causing this?

The Advisor's BMS compares internal resistance against a stored OEM reference value at startup. A new Ni-MH cell reads outside that window until it has completed one full charge-discharge cycle, so the monitor raises a low-battery alarm even when the cell is fully charged. Run one complete cycle — full charge, full discharge under normal monitoring load, then full charge again — before relying on the alarm as accurate. After that cycle, the BMS recalibrates and the alarm clears.

The Advisor will not power on at all after the replacement battery sat uninstalled for several months — how do I recover it?

Ni-MH cells self-discharge during storage, and if the voltage drops below the Advisor's BMS recovery threshold (typically around 10V for a 12V pack), the device will not attempt to boot. Connect the battery to the monitor and leave it on charge for a minimum of 4 hours before pressing power — the charge IC needs time to trickle-charge the cell back above the recovery threshold before the BMS will allow a boot sequence. If the monitor still does not power on after a 4-hour charge, confirm the battery terminal voltage reads above 10.8V using a multimeter at the connector pins.

The Advisor 12-636A is shutting off unexpectedly during patient monitoring sessions in the first week of use — is this normal?

In the first 10 cycles, a new Ni-MH cell delivers less peak current than a fully conditioned cell, and the Advisor's monitoring load — particularly during simultaneous SpO2 and NIBP measurements — creates short high-draw spikes that can push the BMS to a protective cutoff. This is a conditioning issue, not a defective cell. Continue using the battery through normal monitoring sessions; capacity and peak-current delivery stabilise after 8–10 full cycles. If shutdowns continue beyond 10 cycles, check that the battery contacts in the monitor's bay are clean and making firm contact.

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