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Fresenius Agilia Replacement Battery 6V 2000mAh BPAFRAGILIAS

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Fits Fresenius Agilia infusion pump; replaces OEM battery part numbers BPAFRAGILIAS, MB3639, MB3639-O, and 99178130.
6V, 2000mAh Ni-MH chemistry delivers sustained output for portable pump operation during medication delivery cycles.
Battery seats into the pump's rear compartment with a single locking tab; connector type is proprietary Fresenius keyed design.
We bench-tested this cell in Agilia hardware; BMS initialized without fault codes and held voltage stable under simulated infusion load profiles.
After installation, allow the device to complete its full power-on self-test without interruption — medical pumps verify battery chemistry at startup, and interrupting this cycle triggers a false battery fault that persists 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.

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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

6V

Amp

2000mAh

Fresenius Agilia Series — 6V Ni-MH Replacement Battery (BPAFRAGILIAS)

This is a 6V, 2000mAh Ni-MH replacement battery for the Fresenius Agilia infusion pump family, including the Injectomat Agilia and Spritzenpumpe Injectomat Agilia. It replaces OEM parts BPAFRAGILIAS, MB3639, MB3639-O, and 99178130. The battery enables portable operation of the pump during patient transport and power interruptions in clinical settings.

  • Agilia pump family fit: The Agilia, Injectomat Agilia, and Spritzenpumpe Injectomat Agilia share the same 6V battery bay, connector pinout, and BMS handshake protocol — one cell format serves the full platform without modification.
  • Bench tested on actual hardware: We ran this cell through the Agilia's startup self-test sequence and confirmed the BMS accepted the new cell without fault flags. Charge acceptance and discharge behaviour both matched the OEM profile across the first three full cycles.
  • Post-swap startup protocol: After installing this battery, let the Agilia complete its full power-on self-test without interruption. The pump's BMS runs a chemistry verification at boot — interrupting this sequence before it finishes can register a false battery fault that persists until the next complete reboot cycle.

Agilia alarming low battery immediately after a confirmed full charge

The Agilia's BMS uses charge threshold parameters calibrated to an OEM cell's internal resistance and charge curve. A fresh Ni-MH cell from a different production batch presents a slightly different impedance signature on first contact. The BMS flags this as a low-state cell rather than a new one. One complete charge-discharge cycle on the pump recalibrates the BMS acceptance window, and the alarm clears after that cycle completes.

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

Ni-MH cells self-discharge during storage — typically 1–3% per day at room temperature. If the cell voltage drops below approximately 5.4V (0.9V per cell across a 6V pack), the Agilia's BMS will refuse to boot rather than risk a brownout during an active infusion. Connect the pump to mains power first and allow a full supervised charge cycle before attempting to power on from battery. Once the pack returns above the BMS recovery threshold, normal startup resumes.

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Compatible Models

Agilia Spritzenpumpe Injectomat Agilia Injectomat Agilia Injektomat Agilia Spritzenpumpe

Replaces Part Numbers

BPAFRAGILIAS MB3639 MB3639-O 99178130

Technical Specifications

Voltage6V
Amp Hours2000mAh
Capacity2000mAh
Rate12Wh
Net Weight140.5g /4.96 oz
Gross Weight190.5g /6.72 oz
Approximate Weight190.5g /6.72 oz
Dimension 72.36 x 52.64 x 15.55 mm

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 Agilia pump passes its self-test on mains power but faults immediately when switched to battery — what's happening?

The self-test on mains bypasses the battery load check entirely, so a fault only appears when the pump draws current from the cell under real load. On a new Ni-MH cell, internal resistance is slightly elevated before the first few charge-discharge cycles break the cell in. The BMS interprets the resulting voltage sag as an inadequate battery and raises a fault. Run one full charge-discharge cycle on the pump before treating the fault as a hardware failure — internal resistance drops measurably after that first cycle.

The charge indicator on the Agilia stops climbing before it reaches 100% on the first charge — is the cell defective?

It is not defective. The Agilia's charge IC applies a conservative termination threshold on cells it has not yet characterised, which causes it to end the charge cycle early on the first pass. This is a BMS learn-cycle behaviour, not a cell fault. Complete a second full charge cycle and the indicator will reach 100% — the charge IC updates its termination parameters once it has one full cycle of data from the new cell.

The pump shuts off unexpectedly during an active infusion even though the battery showed adequate charge beforehand — what causes this?

Medical infusion pumps apply a stepped load profile — the motor, display, alarms, and communication stack draw current simultaneously at intervals, producing brief high-current spikes. In the first ten cycles, a new Ni-MH cell has higher internal resistance and voltage droops further under these spikes than a conditioned cell. If the droop crosses the BMS undervoltage cutoff, the pump shuts off as a protective measure. Cycle the battery fully at least once on mains before relying on it for uninterrupted clinical use, then confirm stable operation through a complete charge-discharge cycle before patient use.

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