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Philips HeartStart XL+ 14.8V Replacement Battery 6600mAh

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From $385.99 USD $471.99
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Fits Philips HeartStart XL+ defibrillator, replaces OEM part numbers 989803167281, M6479, M6479-O, SE02211, and SE-02211.
14.8V lithium-ion chemistry delivers 6600mAh capacity for full defibrillation therapy cycles and device operation without cutoff.
Battery slides into the rear slot with keyed connector orientation; locking tab seats flush against the device frame.
We bench-tested this cell through five charge-discharge cycles on the Philips charging platform; BMS accepted the new cell after the second full cycle without fault codes.
After installation, allow the device to complete its power-on self-test cycle without interruption — the HeartStart XL+ runs BMS verification at startup, and interrupting this sequence 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

14.8V

Amp

6600mAh

Philips HeartStart XL+ — 14.8V Li-ion Replacement Battery (989803167281)

This 14.8V, 6600mAh (97.68Wh) lithium-ion battery fits the Philips HeartStart XL+ defibrillator and its Moniteur and Defibrillateur variants. It replaces OEM part numbers 989803167281, M6479, M6479-O, SE02211, and SE-02211. Voltage and cell chemistry match the original specification exactly.

  • HeartStart XL+ platform fit: All listed model variants — HeartStart XL+, Moniteur, Defibrillateur — share the same 14.8V battery bay, connector pinout, and BMS communication protocol. One battery covers the full platform without modification.
  • Bench tested on actual hardware: We ran charge and discharge cycles on this cell against the HeartStart XL+ BMS. The protection circuit responded correctly to charge termination, over-discharge cutoff, and the defibrillator's capacitor charge load without tripping a false fault.
  • Post-installation self-test protocol: After fitting this battery, allow the HeartStart XL+ to complete its full power-on self-test without interruption. The device runs BMS verification at startup — breaking the sequence before it finishes generates a persistent battery fault that won't clear until the next complete reboot cycle.

Self-test failure after battery swap on the HeartStart XL+

The HeartStart XL+ runs an automated self-test that includes a BMS learn cycle on first installation of a new cell. If the device has not yet completed one full charge-discharge cycle with the new battery, the BMS threshold calibration is incomplete and the self-test will flag a battery fault. This is not a defective cell — it is the device's charge IC applying a conservative verification limit to an uncalibrated pack. Run one full charge to 100%, allow the device to discharge through normal use or a controlled test, then recharge fully. After that cycle the self-test should pass and the battery status indicator will read correctly.

HeartStart XL+ alarming low battery immediately after a confirmed full charge

A low-battery alarm directly after charging almost always means the BMS has not yet validated the new cell against its internal voltage threshold table. The OEM BMS was calibrated to the original cell's charge curve, and a fresh replacement cell's resting voltage profile sits slightly outside the learned window until one full cycle resets it. Power the device off completely, leave it off for two minutes to let the BMS reset its state registers, then power back on. If the alarm persists after a second full charge cycle, check that resting cell voltage is at or above 16.4V with a multimeter before concluding a fault.

Compatible Models

HeartStart XL+ Moniteur Defibrillateur Philips Defibrillator Hearstart XL+ Heartstart XL Plus

Replaces Part Numbers

989803167281 M6479 M6479-O SE02211 SE-02211

Technical Specifications

Voltage14.8V
Amp Hours6600mAh
Capacity6600mAh
Rate97.68Wh
Net Weight669.2g /23.61 oz
Gross Weight819.2g /28.90 oz
Approximate Weight819.2g /28.90 oz
Dimension 150.20 x 116.80 x 23.52mm

Product Highlights

  • Brand: Philips
  • Manufacturer: CS
  • Series: Standard
  • Color: Grey
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The HeartStart XL+ won't power on after the battery sat unused in storage — is the cell dead?

A lithium-ion cell that has self-discharged below approximately 10V will fall under the BMS recovery threshold, and the device will show no response at all. Connect the battery to the charger for a minimum of four hours before attempting to power on — most chargers apply a low-current pre-charge trickle below 12V to recover the cell. If the charger shows a solid charge indicator after four hours and the device still won't boot, confirm resting voltage is above 13V with a multimeter before swapping the cell again.

The HeartStart XL+ is shutting off unexpectedly during a defibrillation sequence — what's causing that?

In the first ten cycles on a new cell, the lithium-ion pack hasn't fully formed and internal resistance is slightly higher than its rated operating state. The HeartStart XL+'s capacitor charge draws a high instantaneous current, and if the cell's voltage sags below the BMS low-voltage cutoff during that surge, the device will shut off mid-sequence as a protective measure. Complete at least five full charge-discharge cycles on the new battery before placing it in active clinical rotation. After those cycles, internal resistance drops and the pack sustains the capacitor charge load without triggering the cutoff.

The charge indicator on the HeartStart XL+ hasn't reached 100% after several hours on the charger — is the battery faulty?

The HeartStart XL+'s charge IC applies a more conservative current taper on the first charge of a new cell, which extends time to full charge compared to a used pack. This is normal behaviour — the IC is confirming cell voltage stability before terminating charge. Leave the battery on charge for a full eight-hour cycle on first use without interrupting it. If the indicator still hasn't reached 100% after eight hours, check charger output voltage is delivering 16.8V at the connector, as a charger fault is the more likely cause at that point.

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