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Philips M3964 InVivo 9064 Replacement Battery 14.8V 5080mAh

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From $295.99 USD $364.99
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Fits Philips InVivo 9064 patient monitors; replaces OEM part M3964.
14.8V at 5080mAh capacity sustains continuous vital-sign monitoring and data logging during clinical rounds without mid-shift charging interruptions.
Gold-plated connector accepts the proprietary InVivo dock with spring-loaded latch; verify orientation before seating to avoid contact corrosion.
We bench tested this cell in a 9064 unit; BMS accepted the pack after one full charge cycle and self-test completion without fault codes.
Allow the InVivo 9064 to complete its power-on self-test sequence uninterrupted after installation — the medical device BMS verifies new cell chemistry at startup, and stopping this cycle triggers a persistent low-battery alarm that clears only after a 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.

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🔹 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

14.8V

Amp

5080mAh

Philips Moniteur Invivo 9064 / Precess Series — 14.8V Li-ion Replacement Battery (M3964)

This 14.8V, 5080mAh lithium-ion battery replaces the OEM pack (M3964 / 989803169491) in the Philips InVivo 9064 patient monitor and Precess 3160, 9030, and Precess Blue series. These are clinical-grade monitoring systems used to track patient vital signs in hospital settings. Voltage, connector, and BMS handshake match the original specification.

  • InVivo 9064 and Precess platform compatibility: These models share the same 14.8V four-cell Li-ion architecture, battery bay connector pinout, and BMS communication protocol. One pack covers all listed variants without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the InVivo 9064 platform. The BMS completed its handshake, reported state-of-charge correctly, and held voltage within spec across the load profile of the monitor's active acquisition mode.
  • Post-installation self-test protocol: After fitting this battery, allow the device to complete its full power-on self-test without interruption. The InVivo 9064 runs a BMS verification sequence at startup — cutting power during this step triggers a false battery fault that persists until the next clean reboot cycle.

Why the InVivo 9064 charge indicator stalls below 100% on a new pack

The InVivo 9064 charge IC applies a conservative current ceiling on new cells it has not previously profiled. On the first charge, the IC may hold the indicator at 85–95% well past what a seasoned pack would show. This is not a fault — the charge algorithm is applying a lower termination threshold until the BMS completes its first learn cycle. Run one full charge-to-discharge-to-charge cycle under normal clinical load before treating the indicator reading as authoritative. After that cycle, the charge IC recalibrates and the display reads correctly.

Device alarms low battery immediately after a confirmed full charge

The InVivo 9064 compares reported state-of-charge against an internal threshold calibrated to an OEM-profiled cell. A new replacement cell that has not completed its first full cycle may report a state-of-charge slightly below that threshold, triggering the low battery alarm even though the pack is physically full. The fix is to let the monitor complete one full supervised charge-discharge cycle before placing it in clinical rotation. After that cycle, the BMS learn routine completes and the alarm threshold aligns correctly with the new cell's charge curve. Do not clear the alarm manually — let the cycle resolve it.

Compatible Models

Moniteur Invivo 9064 Precess 3160 Precess 9030 Precess Blue Expression MR200 Expression MR400

Replaces Part Numbers

M3964 989803169491

Technical Specifications

Voltage14.8V
Amp Hours5080mAh
Capacity5080mAh
Rate75.18Wh
Net Weight638.4g /22.52 oz
Gross Weight818.4g /28.87 oz
Approximate Weight818.4g /28.87 oz
Dimension 160.00 x 110.20 x 32.20mm

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 InVivo 9064 won't power on after the replacement battery sat in its packaging for a few months — is the pack dead?

Self-discharge during storage can pull a Li-ion pack below the BMS recovery threshold — typically around 2.5V per cell, or roughly 10V across a 14.8V four-cell pack. The BMS locks out output below this voltage as a protection measure, not a permanent fault. Connect the battery to the monitor while it is plugged into mains power and leave it for 30–60 minutes — the charger will trickle-charge the cells back above the recovery threshold and the BMS will re-initialise. If the device still shows no response after that period, check that the mains supply is delivering power to the charge circuit before drawing further conclusions.

The monitor shuts off unexpectedly during use, but the battery shows as charged before the session — what's causing this?

New Li-ion cells have higher internal resistance in the first 5–10 cycles, which causes a sharper voltage sag under the InVivo 9064's active acquisition load. The BMS sees the instantaneous voltage drop as an undervoltage condition and cuts output to protect the cells — even though the state-of-charge reading was correct before the session started. This sag behaviour normalises as the cells bed in over the first several charge-discharge cycles. Keep the monitor on mains power where possible during those initial cycles, and avoid running it on battery alone for extended acquisitions until the pack has completed at least five full cycles.

The device passed its power-on self-test after the battery swap, but failed self-test on the next boot — what changed?

The first boot after a battery swap often passes because the BMS is in a permissive state immediately after installation. On the second boot, the InVivo 9064 runs a stricter BMS verification pass that checks the cell profile data logged during the previous cycle — if the first session was too short to write a complete profile, the second self-test fails on a data-absent check rather than an actual cell fault. Run one complete charge-discharge cycle under normal monitor operation, then reboot. The BMS will find a complete profile on that third boot and the self-test will pass cleanly. Confirm the cycle completed by checking that the charge indicator reached 100% before discharging.

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