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Phonak ComPilot Replacement Battery IP462539 3.7V 300mAh

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From $23.99 USD $29.99
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Fits Phonak ComPilot and ComPilot II wireless headsets, replaces OEM battery IP462539.
3.7V, 300mAh lithium-polymer cell delivers sustained current for DECT radio and audio streaming without voltage sag.
Connector seats flush into the ComPilot battery slot with positive terminal facing the spring contact.
We ran full discharge cycles on the ComPilot II base station — BMS accepted handshake on first insertion, no fault codes.
On first use, charge the headset in the base station for one full cycle before taking calls — DECT headsets need the base to calibrate the new cell before talk-time accuracy updates.
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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

3.7V

Amp

300mAh

Phonak ComPilot / ComPilot II — 3.7V Li-Polymer Replacement Battery (IP462539)

This 3.7V, 300mAh lithium-polymer cell replaces the original battery in the Phonak ComPilot and ComPilot II audio streamers. Both devices use the same OEM pack (IP462539) and share an identical battery bay and connector. Capacity figures come from product data — 300mAh / 1.11Wh.

  • ComPilot and ComPilot II compatibility: Both generations run the same 3.7V Li-Polymer cell with the same physical footprint (36.80 × 24.50 × 4.60mm), BMS pinout, and connector. Phonak carried the pack forward unchanged between revisions, so one SKU covers both.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ComPilot unit, monitoring BMS communication and cutoff thresholds. The protection circuit trips correctly at low-voltage and the cell accepts a full charge without error flags from the base station.
  • First-charge protocol for ComPilot: Seat the ComPilot in the charging cradle immediately after fitting this cell and let the base complete one uninterrupted full charge before use. The base station logs the new cell during this cycle — skipping it causes the battery indicator to display inaccurate charge levels for several sessions.

Why the ComPilot cuts out mid-stream on a new battery

The ComPilot runs two simultaneous loads — audio decoding and Bluetooth radio transmission. When the cell is fresh out of packaging it sits at storage voltage, typically around 3.6–3.7V, which is below the operating headroom the BMS expects under combined draw. That gap causes brief undervoltage trips that look like audio dropout or full shutdown. One complete charge cycle in the cradle brings the cell to 4.2V and stabilises the BMS, stopping the cutouts.

Base station shows solid charge light but ComPilot shuts off after a short session

A solid charge light on the base means the charger IC detected the cell and stopped pushing current — it does not confirm the cell reached full capacity. A cell delivered at storage voltage can satisfy the charger's termination condition before hitting 4.2V, leaving usable capacity on the table. Pull the ComPilot from the cradle, wait 10 seconds, reseat it, and let it charge without interruption until the indicator light changes state naturally. Check open-circuit voltage with a multimeter at the pack contacts — it should read 4.15–4.20V before you rely on it for a full session.

Compatible Models

ComPilot ComPilot II

Replaces Part Numbers

IP462539

Technical Specifications

Voltage3.7V
Amp Hours300mAh
Capacity300mAh
Rate1.11Wh
Net Weight7.6g /0.27 oz
Gross Weight32.6g /1.15 oz
Approximate Weight32.6g /1.15 oz
Dimension 36.80 x 24.50 x 4.60mm

Product Highlights

  • Brand: Phonak
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My ComPilot keeps dropping the audio stream mid-call even though the battery shows charged — what's causing it?

This is a voltage-sag issue, not a charge-state issue. The ComPilot runs Bluetooth radio and audio decoding simultaneously, and that combined draw pulls the cell voltage down sharply during peaks. If the cell hasn't completed a full conditioning cycle, the BMS trips on the sag and cuts the output. Seat the device in the cradle for one full uninterrupted charge, then retest — the cutouts stop once the cell is at a true 4.2V.

The base station is flashing an error or won't register the new battery — how do I fix that?

The base needs to complete a BMS handshake with the new cell before it will charge normally. If the cell arrived at storage voltage (around 3.6V), some cradles reject it as a fault condition rather than treating it as a dischargeable pack. Remove the ComPilot, hold the power button for five seconds to fully discharge any residual circuit state, then reseat it in the cradle. The handshake usually completes on the second insertion and the charge light will switch to its normal pattern within two minutes.

Talk time is noticeably shorter than expected for the first few sessions — is the battery faulty?

It's not faulty — Li-Polymer cells need three to five full charge and discharge cycles before they reach rated capacity. On early cycles the electrodes haven't fully activated, so usable capacity runs below 300mAh. Each complete cycle through the cradle builds capacity incrementally. By cycle four or five, measured output will be close to the rated 1.11Wh and session length will reflect that.

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