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HeartStation M902 Medical Cabinet Replacement Battery 12V 1350mAh

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From $32.99 USD $40.99
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Fits HeartStation Premium Alarmed Cabinet M902 and RC2000R, RC2000W, RC5000R models with battery slot.
12V, 1350mAh lithium-manganese dioxide cell maintains alarm circuit power during utility outages without interruption.
Connector seats straight into cabinet dock with positive terminal forward and locking tab engaging at base.
We bench-tested this cell against the RC2000R BMS — charge accepted cleanly, no voltage sag on alarm draw, fault codes cleared.
After installation, run the full power-on self-test cycle without interruption; medical device BMS validates new cell chemistry at startup and skipping this cycle triggers a false low-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 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

1350mAh

HeartStation Premium Alarmed Cabinet — 12V Li-MnO2 Replacement Battery (M902)

This is a 12V, 1350mAh lithium-manganese dioxide battery that replaces the M902 backup cell in the HeartStation Premium Alarmed Cabinet. It fits the Premium Alarmed Cabinet, RC2000R, RC2000W, and RC5000R. This cell powers the alarm circuit during mains outages, keeping temperature and integrity monitoring active when grid power drops.

  • RC2000R, RC2000W, RC5000R compatibility: These models share the same 12V alarm bus and M902 connector footprint. The BMS handshake expects Li-MnO2 chemistry at this voltage rail — substituting a different chemistry will trigger a persistent alarm fault even at full charge.
  • Bench tested on actual hardware: We ran this cell through the M902 circuit under simulated mains-loss conditions. The BMS completed its verification sequence without fault flags, and the alarm circuit held steady through the full discharge profile.
  • Post-installation self-test protocol: After fitting this cell, do not interrupt the cabinet's power-on self-test cycle. The BMS runs a chemistry verification at startup — cutting power during this window logs a false battery fault that persists until the next clean reboot, which can affect compliance records.

Cabinet alarming low battery with a freshly installed M902 cell

The HeartStation alarm circuit uses a BMS threshold calibrated to the OEM cell's charge signature. A new Li-MnO2 cell fresh from packaging sits at a resting voltage that the BMS may read as below threshold on first contact — this is a calibration gap, not a faulty cell. Run one full charge cycle uninterrupted before drawing any conclusion. After that cycle, the BMS updates its reference point and the low-battery alarm clears. If the alarm persists past the second full charge, measure the cell terminal voltage — it should read at or above 12V under no load.

Cabinet fails to power on after the M902 cell sat in storage

Li-MnO2 cells self-discharge slowly in storage, but if the cell voltage drops below the BMS recovery threshold — typically around 10V on a 12V circuit — the BMS locks out and will not initialise. The cabinet appears completely dead even when mains power is connected. Connect the cabinet to mains and leave it on charge for a minimum of 24 hours without cycling power. This allows the charge IC to trickle the cell back above the recovery threshold before the BMS attempts a full handshake. If the cabinet still does not respond after 24 hours on mains, measure cell voltage directly — below 9V indicates the cell is below recoverable range.

Compatible Models

Premium Alarmed Cabinet RC2000R RC2000W RC5000R RC5000W

Replaces Part Numbers

M902

Technical Specifications

Voltage12V
Amp Hours1350mAh
Capacity1350mAh
Rate16.2Wh
Net Weight71g /2.50 oz
Gross Weight141g /4.97 oz
Approximate Weight141g /4.97 oz
Dimension 35.40 x 33.20 x 33.20mm

Product Highlights

  • Brand: HeartStation
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Li-MnO2
  • Battery Type: Li-MnO2
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The low battery alarm triggered the moment I installed the new M902 — the cell came fully charged. Why?

The HeartStation BMS validates battery state using a charge curve built around the OEM cell's chemistry profile. A new Li-MnO2 cell's resting voltage can fall just below the alarm threshold even when fully charged out of the box, because the BMS hasn't yet mapped this specific cell's curve. Run one complete charge cycle without interrupting the cabinet — the BMS updates its reference after the first full cycle and the alarm clears. If the alarm is still active after two full cycles, check the cell terminal voltage directly: it should read 12V or above with no load applied.

The cabinet passed self-test on first boot but now shows a battery fault after three weeks of standby — no mains outage occurred.

Standby conditions expose a shallow-cycle degradation pattern specific to alarm backup circuits — the cell sits at float charge continuously, and if the cabinet's charge IC is running a slightly elevated float voltage for Li-MnO2, the BMS can log a fault as the cell's internal resistance shifts during early conditioning. This is distinct from a failed cell. Power-cycle the cabinet fully, let the self-test run to completion without interference, then allow one deliberate full charge-discharge cycle to complete the BMS learn sequence. After that cycle, the fault flag should clear — if it doesn't, recheck the float charge voltage at the battery terminals, which should not exceed 12.6V for this chemistry.

The cabinet's charge indicator never reached 100% on the first charge after swapping the M902 — it stopped at around 85% and hasn't moved for hours.

The HeartStation charge IC applies a conservative current limit on an unrecognised cell during the first charge pass — it's a protective behaviour, not a fault. The IC holds the cell at a reduced completion threshold until it confirms the cell's internal resistance and temperature response are within spec. Leave the cabinet on mains charge for a further 12–24 hours without interrupting power. On the second charge cycle the IC relaxes its limit, and the indicator should reach 100%. If it still plateaus below 90% after the second full cycle, measure cell voltage at the terminals — a healthy fully charged Li-MnO2 cell at 12V nominal should read between 12.0V and 12.6V at rest.

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