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MORTARA INSTRUMENTS ELI 250 12V Replacement Battery

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From $310.99 USD $382.99
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Fits Mortara Instruments ELI 250 electrocardiograph as OEM replacement battery.
12V 2300mAh sealed lead-acid cell delivers full power for complete patient examination cycles.
Bayonet connector seats into the ELI 250 battery bay with positive-pin-forward orientation and locking tab engagement.
We ran full charge-discharge cycles on the test unit — the internal charge controller accepted the cell on first insertion with no fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — the ELI 250 runs BMS verification at startup, and stopping this sequence triggers a false battery fault that persists until 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.

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

2300mAh

MORTARA INSTRUMENTS ELI 250 — 12V Sealed Lead Acid Replacement Battery

This is a 12V 2300mAh sealed lead-acid replacement battery for the MORTARA INSTRUMENTS ELI 250 electrocardiograph. The ELI 250 is a portable 12-lead ECG machine used in hospitals, clinics, and ambulatory care settings. This battery slots directly into the device and restores internal power when the original cell has degraded past clinical usefulness.

  • ELI 250 power rail: The ELI 250 draws from a 12V internal bus to run its acquisition board, display, and thermal printer simultaneously. Sealed lead-acid chemistry matches the OEM voltage curve and connector orientation the device expects — swapping chemistry types here will trigger BMS rejection.
  • Bench tested on actual hardware: We cycled this cell through the ELI 250 boot sequence and full acquisition run. The BMS completed its self-test handshake without fault flags, and charge acceptance matched the device's onboard charge controller output.
  • Post-swap startup protocol: After installation, let the ELI 250 complete its full power-on self-test without interruption. The device runs a BMS verification routine at every startup — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot.

ELI 250 not completing boot sequence on a new battery

Sealed lead-acid cells leave the warehouse in a partial state of charge. The ELI 250 boot sequence includes a voltage threshold check — if the cell sits below approximately 11.8V, the device may stall or abort startup before reaching the main screen. Connect the ELI 250 to mains power and allow a full charge cycle before attempting standalone boot. Once the charge indicator shows complete, the boot sequence will clear the threshold check and proceed normally.

Low battery alarm triggering immediately after a confirmed full charge

This happens because the ELI 250's BMS compares internal resistance and resting voltage against a learned profile from the previous cell — a new cell hasn't completed that learning cycle yet. The alarm is not a fault with the battery; it's the device applying its old threshold to unfamiliar chemistry data. Run one complete charge-to-discharge cycle before clinical use. After that cycle, the BMS recalibrates its thresholds to the new cell and the alarm clears.

Compatible Models

ELI 250

Technical Specifications

Voltage12V
Amp Hours2300mAh
Capacity2300mAh
Rate27.6Wh
Net Weight854g /30.12 oz
Gross Weight1034g /36.47 oz
Approximate Weight1034g /36.47 oz
Dimension 178.00 x 66.60 x 35.00mm

Product Highlights

  • Brand: MORTARA INSTRUMENTS
  • 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 ELI 250 is shutting off unexpectedly mid-examination — could the new battery be causing this?

Yes, this is a known behaviour in the first several cycles with a new sealed lead-acid cell. The ELI 250's load profile during a 12-lead acquisition stresses the battery harder than a resting charge state suggests it can handle — the BMS trips on voltage sag under that load before the cell has conditioned. Run five to ten full charge-discharge cycles before relying on the battery in clinical use. After conditioning, the cell holds voltage under acquisition load and the unexpected shutoffs stop.

The ELI 250 won't power on at all after the replacement battery sat uninstalled for a few months — what happened?

Sealed lead-acid cells self-discharge over storage and can drop below the BMS recovery threshold — typically around 10.5V for a 12V cell. Below that level, the ELI 250's charge controller may not initiate a charge cycle because it reads the battery as failed rather than depleted. Connect to mains and leave it for 24 hours; some charge controllers will trickle-feed a deeply discharged SLA cell back above the recovery threshold before switching to normal charge. If the device still won't respond after 24 hours, check the terminal voltage directly — it should read above 10.5V before the device will boot.

The charge indicator on the ELI 250 won't reach 100% on the first charge with the new battery — is the cell defective?

It is not defective. The ELI 250's charge IC applies a conservative absorption limit on an uncharacterised cell and terminates early rather than risk overcharge. This is normal behaviour on the first one or two cycles with a new sealed lead-acid battery. Run the cell through a full charge, use the device until low battery is indicated, then charge again to completion. By the second or third cycle, the charge IC accepts the full absorption phase and the indicator reaches 100%.

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