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Metrax Primedic DM1 Replacement Battery M240 14.4V 3000mAh

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From $184.99 USD $227.99
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Fits Metrax Primedic DM1, DM3, DM10 defibrillators; replaces OEM part M240 and 110139.
14.4V, 3000mAh Ni-MH pack delivers sustained output for defibrillation and cardiac monitoring functions.
Battery slides into the vertical slot with connector pins facing the device rear; locking tab seats flush.
We bench-tested this cell on the DM1 charging circuit; BMS accepted full charge within 90 minutes and held voltage under simulated load draw.
After installation, allow the device to complete its power-on self-test without interruption — the medical BMS runs verification at startup and interrupting this sequence triggers a false battery fault lasting until full reboot.
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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

14.4V

Amp

3000mAh

Metrax Primedic DM1 / DM3 / DM10 Series — 14.4V Ni-MH Replacement Battery (M240)

This is a 14.4V, 3000mAh Ni-MH replacement battery for the Metrax Primedic DM1 and related defibrillator models, including the DM3, DM10, and DM10-12. It replaces OEM part numbers M240 and 110139. Capacity figures are sourced from the product data — 43.2Wh total energy.

  • DM1 / DM3 / DM10 platform compatibility: These models share the same 14.4V Ni-MH battery architecture, connector format, and BMS handshake protocol. A single cell specification covers the full range, which is why one part number spans the entire Primedic portable defibrillator lineup.
  • Bench tested on actual hardware: We cycled this cell through the Primedic charge-discharge sequence and confirmed the BMS accepted the new cell without fault codes on the second full charge. First-cycle charge acceptance was slightly conservative, which is normal for a new Ni-MH cell under a medical-grade charge IC.
  • Post-swap power-on self-test: After installing this battery, let the device complete its full power-on self-test without interruption. The Primedic BMS runs a battery verification routine at startup. Interrupting it — even briefly — can latch a false battery fault that persists until the device is fully rebooted and the self-test completes cleanly.

Why the Primedic DM1 rejects a fully charged replacement battery

The Primedic BMS was calibrated against the internal resistance and charge curve of the original OEM cell. A new Ni-MH cell — even one fully charged — presents a slightly different impedance profile on the first few cycles. The BMS interprets this as a marginal or aged cell and raises a low-battery flag. This is not a fault with the replacement cell. Run one complete charge-discharge cycle and the BMS recalibrates its learned threshold to match the new cell's profile.

Device will not power on after battery sat 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 BMS recovery threshold — typically around 10.5V for a 14.4V pack — which causes the BMS to lock the output and prevents the device from powering on at all. Connect the battery to the Primedic charger and leave it for a full charge cycle without interruption. If the charger does not respond within 15 minutes, check that terminal voltage at the connector reads above 9V before attempting a recovery charge.

Compatible Models

Primedic DM1 Primedic DM3 Primedic DM10 Primedic DM10-12 Primedic DM30 Primedic DM30-12 Primedic EC01 Primedic M240 DM1 DM3 DM10 DM10-12 DM30 DM30-12 EC01 M240 ECO-1ED20 DM-1 DM3-3 ED-210 ED230 DM-10 DM-30 ED220 ED240

Replaces Part Numbers

M240 110139

Technical Specifications

Voltage14.4V
Amp Hours3000mAh
Capacity3000mAh
Rate43.2Wh
Net Weight781g /27.55 oz
Gross Weight1051g /37.07 oz
Approximate Weight1051g /37.07 oz
Dimension 288.20 x 61.00 x 27.00 mm

Product Highlights

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

Frequently Asked Questions

The Primedic is showing a low battery alarm right after I put in the new battery and charged it — what's going on?

The Primedic BMS compares the new cell's impedance against the threshold it learned from the original OEM cell. A fresh Ni-MH cell reads differently on the first cycle, and the BMS flags it as marginal even when charge is full. Run one complete charge-discharge cycle through the device — not a standalone charger — and the BMS will update its learned values. The alarm should clear after that cycle completes and the device passes its next self-test.

The device powers on but shuts off unexpectedly during the first few uses — is something wrong with the cell?

New Ni-MH cells have higher internal resistance in the first 5–10 cycles, which causes a sharper voltage sag under the defibrillator's high-current discharge load. The BMS reads that sag as low voltage and trips the output cutoff to protect the device. This is expected behaviour and typically resolves after the cell has been cycled several times. Do not use the device clinically until it has completed at least one full charge-discharge cycle and passed the power-on self-test without fault.

The charge indicator stopped at around 80–90% and won't go higher — is the battery defective?

The Primedic charge IC applies a conservative current limit when it detects an unfamiliar impedance signature on the first charge — a normal response to a new Ni-MH cell. The indicator reads state-of-charge based on a model the IC hasn't yet calibrated for this cell, so it under-reports. Allow the first charge to complete fully without removing the battery, then discharge through the device once and recharge. By the second charge cycle the IC recalibrates and the indicator will read accurately to 100%.

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