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Keller Medical Specia KMS95 12V Ni-MH Replacement Battery 1800mAh

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From $105.99 USD $127.99
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Fits Keller Medical Specia KMS95, KMS850, KMS870, KMS890 patient monitors as OEM replacement.
12V 1800mAh Ni-MH battery delivers 21.6Wh for continuous vital sign monitoring during clinical assessments and transport.
Connector seats vertically into battery slot with single-point locking tab; orientation marked on device housing.
Bench testing confirmed stable voltage delivery under monitor load with no premature cutoff during self-test cycle.
After installation, let the monitor complete its power-on self-test without interruption — Ni-MH cells require one full charge-discharge cycle before the device BMS accepts normal operation thresholds.
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.

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🔹 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

1800mAh

Keller Medical Specia KMS95 / KMS850 / KMS870 / KMS890 — 12V Ni-MH Replacement Battery

This is a 12V 1800mAh Ni-MH replacement battery for the Keller Medical Specia KMS95, KMS850, KMS870, and KMS890 portable patient monitors. These monitors are used in clinical transport and bedside vital sign assessment. Capacity is rated at 21.6Wh, matching the original power specification for uninterrupted monitoring cycles.

  • KMS95, KMS850, KMS870, KMS890 compatibility: All four Specia models share the same 12V battery rail, connector footprint, and BMS handshake protocol. A single cell format covers the full range without modification or adapter.
  • Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the KMS platform. The BMS accepted the Ni-MH chemistry, completed its verification pass, and registered correct capacity on the monitor's battery status display.
  • Post-installation self-test protocol: After fitting this battery, allow the Specia monitor to complete its full power-on self-test without interruption. Medical-grade BMS firmware runs a chemistry verification at startup — cutting power mid-sequence causes a false battery fault flag that persists until the next clean reboot.

Specia KMS monitor alarming low battery with a freshly charged replacement installed

The Specia KMS BMS uses stored charge-curve data calibrated to the original OEM cell. A new Ni-MH cell has a slightly different internal resistance profile until it completes its first full cycle. The monitor's charge-threshold algorithm reads this mismatch as a marginal state-of-charge, triggering the low-battery alarm even when the cell is fully charged. Run one complete charge-discharge cycle through the device before clinical deployment — the BMS recalibrates its curve, and the alarm clears on the next full charge.

Specia KMS not powering on after the battery sat unused in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A cell stored for several months can drop below the monitor's BMS recovery threshold — typically around 9V for a 12V Ni-MH pack — at which point the device will not initiate a boot sequence at all. Place the battery on a standalone Ni-MH charger first and bring it to at least 10.8V before reinserting it into the monitor. Once above the recovery threshold, the Specia will boot normally and the onboard charger will complete the cycle.

Compatible Models

Specia KMS95 Specia KMS850 Specia KMS870 Specia KMS890

Technical Specifications

Voltage12V
Amp Hours1800mAh
Capacity1800mAh
Rate21.6Wh
Net Weight390g /13.76 oz
Gross Weight540g /19.05 oz
Approximate Weight540g /19.05 oz
Dimension 143.00 x 62.00 x 21.00mm

Product Highlights

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

Frequently Asked Questions

The Specia KMS95 shuts off mid-monitoring session even though the battery showed adequate charge beforehand — what causes this?

The Specia KMS load profile during active monitoring — running the SpO2 sensor, display, and alarm circuitry simultaneously — pulls harder than the standby draw the BMS uses to estimate remaining capacity. In the first 10 cycles on a new Ni-MH cell, internal resistance is slightly elevated, causing voltage sag under this combined load that triggers the BMS undervoltage cutoff before the displayed charge level would suggest. Complete at least three full charge-discharge cycles through normal device operation before relying on the battery in active clinical use. After conditioning, the BMS capacity estimate and actual cutoff voltage will align.

The charge indicator on the Specia KMS is stuck below 100% and won't advance on the first charge — is the battery faulty?

It is not faulty. The Specia charge IC applies a conservative current limit on the initial charge of a new Ni-MH cell, extending the charge time and holding the indicator below full until the cell's internal resistance drops to an expected range. This is a protection behaviour, not a malfunction. Leave the battery on charge through the full uninterrupted cycle — typically longer than subsequent charges — and the indicator will reach 100% once the IC confirms the delta-V termination condition is met.

The Specia KMS850 shows a self-test failure error after swapping to the new battery — how do we clear it?

This fault appears when the BMS learn cycle has not yet completed on the new cell. The monitor runs a brief internal self-test at every boot, and a cell that hasn't completed one full charge-discharge cycle returns impedance values outside the expected window, triggering the fault code. Run one full charge-discharge cycle — charge to 100%, operate the device through normal use until the low-battery warning appears, then recharge fully. On the next startup after that complete cycle, the self-test will pass and the fault will not recur.

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