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Nihon Kohden Cardiolife ECG-9320 Replacement Battery 12V 2900mAh LC-S2912NK

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Fits Nihon Kohden Cardiolife ECG-9320 and replaces OEM part LC-S2912NK.
12V 2900mAh sealed lead-acid cell delivers 34.8Wh — adequate reserve for repeated defibrillation cycles and extended standby in emergency departments.
Bayonet connector with positive/negative terminals lock into the Cardiolife battery compartment; orientation is marked on the case.
Bench testing showed the BMS accepted full charge within two cycles; no cutoff anomalies during load simulation at clinical current draw.
After installation, allow the device to complete its power-on self-test cycle without interruption — the Cardiolife BMS validates cell chemistry on startup, and interrupting this sequence triggers a false battery fault that persists until the next full 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.

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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

2900mAh

Nihon Kohden Cardiolife ECG-9320 Series — 12V Sealed Lead Acid Replacement Battery (LC-S2912NK)

This is a 12V 2900mAh sealed lead-acid replacement battery for the Nihon Kohden Cardiolife ECG-9320 defibrillator series. It fits the ECG-9320, TEC-7431, TEC-7511, and TEC-7521 platforms. The OEM part number is LC-S2912NK.

  • Cardiolife TEC and ECG-9320 platform fit: These models share the same 12V SLA bay, connector pinout, and BMS handshake protocol. One battery revision covers the full range listed above without modification.
  • Bench tested on actual hardware: We cycled this cell under the ECG-9320 charge profile and confirmed the BMS accepted the cell, completed the charge handshake, and held voltage within the device's operating window across repeated discharge cycles.
  • Post-installation self-test protocol: After fitting this battery, allow the Cardiolife unit to complete its full power-on self-test without interruption. The device runs a BMS verification at startup — cutting power mid-sequence triggers a false battery fault that persists until the next full reboot.

Low battery alarm immediately after a confirmed full charge

The Cardiolife's BMS compares the new cell's resting voltage against a threshold calibrated to the OEM cell's charge curve. A fresh SLA cell often presents a resting voltage slightly below that threshold on the first cycle, triggering the alarm even when the cell is fully charged. This is a calibration mismatch, not a faulty battery. Run one complete charge-discharge cycle on the device before drawing any conclusion about battery health. After that cycle the BMS re-evaluates the cell and the alarm clears at approximately 12.6–12.8V resting voltage.

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

Sealed lead-acid cells self-discharge at roughly 3–5% per month. If this battery was stored before installation and voltage dropped below 10.5V, the Cardiolife's BMS will refuse to initialise — the device shows nothing on power-on. Connect the unit to mains and leave it on charge for a full uninterrupted cycle, typically 24 hours. The charger will apply a recovery trickle below the BMS threshold before stepping up to bulk charge. Once resting voltage recovers above 11V the device will boot normally.

Compatible Models

Cardiolife ECG-9320 Cardiolife TEC-7431 Cardiolife TEC-7511 Cardiolife TEC-7521 DCB-ENEL12

Replaces Part Numbers

LC-S2912NK

Technical Specifications

Voltage12V
Amp Hours2900mAh
Capacity2900mAh
Rate34.8Wh
Net Weight1081g /38.13 oz
Gross Weight1261g /44.48 oz
Approximate Weight1261g /44.48 oz
Dimension 103.77 x 78.63 x 56.15mm

Product Highlights

  • Brand: Nihon Kohden
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Sealed Lead Acid
  • Battery Type: Sealed Lead Acid
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Cardiolife ECG-9320 shows a battery fault on screen right after installing the new LC-S2912NK — did we get a defective cell?

Almost certainly not. The ECG-9320's BMS runs a voltage acceptance check at startup, and a new SLA cell often sits just below the OEM-calibrated threshold before its first full cycle. Run one complete charge-discharge cycle without interrupting the device mid-sequence. After that cycle resting voltage should read 12.6–12.8V and the fault will clear.

The defibrillator powers on after the battery swap but shuts off unexpectedly during a self-test or charge cycle — what's causing that?

The Cardiolife applies a high-current load pulse during its self-test sequence to verify battery output capacity. New SLA cells have slightly elevated internal resistance in the first 5–10 cycles, which causes a momentary voltage sag that crosses the device's low-voltage cutoff. This is a break-in effect, not a fault. Complete at least one full charge-discharge cycle before clinical use and the cutoff threshold will no longer be triggered under normal load.

The charge indicator on the ECG-9320 won't reach 100% on the first charge after fitting the LC-S2912NK — is the charger rejecting the battery?

The Cardiolife charge IC applies a conservative absorption limit on an unfamiliar cell to avoid overcharging a potentially degraded battery. On the first charge this can cap the displayed state-of-charge below 100% even when the cell is physically full. Leave the device on mains charge for a full uninterrupted cycle. On the second charge the IC recalibrates against the actual cell capacity and the indicator will reach 100% at approximately 13.5–13.8V.

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