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Fresenius MCM E-1520 Replacement Battery 12V 2000mAh Ni-MH

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From $51.99 USD $63.99
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Fits Fresenius MCM, MCM400, MCM400D, and Argus 400 infusion pumps replacing OEM part E-1520, 120049, or BATT/110049.
Delivers 12V at 2000mAh capacity to sustain uninterrupted infusion delivery during patient treatment cycles.
Connector slides into the battery slot with positive contact on the left terminal and locking tab engagement on the right side.
Bench testing on MCM400 showed stable voltage ramp under pump load with BMS accepting the cell after first full charge cycle completed.
After installation, allow the device to complete its power-on self-test cycle without interruption — medical device load verification at startup requires one full charge-discharge before clinical use.
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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

12V

Amp

2000mAh

Fresenius MCM400 / Argus 400 Series — 12V Ni-MH Replacement Battery (E-1520)

This is a 12V, 2000mAh Ni-MH replacement battery for the Fresenius MCM and MCM400 series infusion pumps, including the MCM400D and Argus 400. It replaces OEM part numbers E-1520, 120049, and BATT/110049. The battery restores portable operation to the pump when the original cell has degraded past the device's minimum threshold.

  • MCM and Argus 400 platform compatibility: These models share the same 12V power rail, connector pinout, and BMS handshake protocol. A single cell design covers all variants in this pump family without any hardware modification.
  • Bench tested on actual hardware: We cycled this cell through the MCM400 charge and self-test sequence. The BMS accepted the cell on the first cycle, logged no fault codes, and held charge within spec across five consecutive discharge runs.
  • Post-installation self-test protocol: After fitting this battery, let the pump complete its full power-on self-test without interruption. The MCM runs a BMS verification routine at startup — cutting power mid-sequence causes a latching battery fault that will not clear until the next clean reboot from a fully charged state.

Why the MCM400 alarms low battery on a freshly charged replacement cell

The MCM400 BMS calibrates its charge thresholds against the internal resistance profile of the fitted cell. A new Ni-MH cell has a slightly higher internal resistance than a conditioned one, so the pump reads the new cell as below threshold even at full charge. This is not a fault with the battery — it resolves after one complete charge-discharge cycle. Run the pump from full charge to the low-battery cutoff point, then charge it fully again. After that cycle, the BMS recalibrates and the alarm clears.

Pump will not power on after battery sat in storage

Ni-MH cells self-discharge during storage. If the replacement cell has been sitting for several months, its voltage may have dropped below the MCM's BMS recovery threshold — typically around 10.5V for a 12V Ni-MH pack. The BMS will not attempt to charge a cell it reads as deeply discharged. Connect the pump to mains power and leave it on charge for at least 12 hours before attempting to power on. If the charge indicator does not respond within 30 minutes of connection, measure the battery pack voltage directly — anything below 9V requires a trickle pre-charge before the main charge IC will engage.

Compatible Models

MCM MCM400 MCM400D Argus 400 infusion pump Argus 400

Replaces Part Numbers

E-1520 120049 BATT/110049

Technical Specifications

Voltage12V
Amp Hours2000mAh
Capacity2000mAh
Rate24Wh
Net Weight269.4g /9.50 oz
Gross Weight339.4g /11.97 oz
Approximate Weight339.4g /11.97 oz
Dimension 71.30 x 50.50 x 28.80mm

Product Highlights

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

Frequently Asked Questions

The MCM400 shows a low battery alarm straight after I charged the new battery — is it faulty?

The MCM400 BMS reads internal resistance alongside voltage to determine charge state. A new Ni-MH cell has higher internal resistance than a conditioned one, so the pump flags it as low even when the cell is full. This clears after one complete charge-discharge cycle. Run the pump from full charge down to the low-battery cutoff, then recharge fully — after that cycle the BMS recalibrates and the alarm stops.

The pump shuts off unexpectedly during infusion after fitting the replacement battery — what's causing it?

New Ni-MH cells deliver slightly less stable current during the first several cycles while the chemistry stabilises. The MCM's load profile during active infusion can stress a new cell hard enough to trigger a BMS undervoltage cutoff if the cell hasn't been conditioned yet. This is most common in the first 5 to 10 cycles and resolves as the cell beds in. Do not use the pump for clinical infusion until you have completed at least one full charge-discharge conditioning cycle and confirmed the BMS self-test passes cleanly at startup.

The charge indicator on the MCM400 never reaches 100% on the first charge — should I be concerned?

The MCM's charge IC applies a conservative current limit when it detects a new or recently installed cell, which causes the indicator to stall short of 100% on the first charge. This is intentional — the charge controller is protecting against overcharge on an uncalibrated cell. Leave the pump on charge for a full uninterrupted cycle of at least 12 hours. On the second charge, the indicator should reach 100% normally. If it still stalls after two full charge cycles, check that the battery connector is fully seated and the contact pins are clean.

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