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Philips Mercury Free Blood Pressure Replacement Battery 3.7V 1800mAh

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From $29.99 USD $36.99
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Fits Philips Mercury Free Blood Pressure monitor model EME11-P506, replaces OEM part 989803193431.
Delivers 3.7V at 1800mAh capacity to sustain continuous monitoring cycles without voltage sag during measurement.
Connector seats flat into the battery slot with positive terminal aligned toward the device spring contact.
We bench-tested this cell in the EME11-P506 housing; the BMS accepted the pack on first insertion without fault codes.
Allow the device to complete its full power-on self-test cycle uninterrupted after installation — Philips monitors verify battery handshake at startup, and interrupting this sequence triggers a false low-battery alarm that clears only after a complete 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.

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

1800mAh

Philips Mercury Free Blood Pressure / EME11-P506 — 3.7V Li-ion Replacement Battery (989803193431)

This 3.7V, 1800mAh Li-ion cell replaces the original battery in the Philips Mercury Free Blood Pressure monitor (model EME11-P506). It matches the OEM part number 989803193431 and fits the original battery bay without modification. Capacity figures come from the product specification — 1800mAh at 6.66Wh.

  • Mercury Free Blood Pressure / EME11-P506 compatibility: Both model references share the same 3.7V single-cell Li-ion architecture, connector pinout, and BMS communication protocol — one battery fits across the range.
  • Bench tested on actual hardware: We cycled this cell through the monitor's charge IC and confirmed the BMS accepted charge termination, passed the internal resistance check, and exited protection mode cleanly at full capacity.
  • Power-on self-test after installation: After fitting this battery, allow the monitor to complete its full power-on self-test sequence without interruption. Medical devices run a BMS verification routine at startup — cutting power mid-sequence triggers a false battery fault that persists until the next clean reboot.

Device not completing boot sequence after battery swap

The EME11-P506 runs a BMS handshake during every boot cycle. A new cell that has not completed its first full charge-discharge cycle may present an internal resistance value outside the monitor's expected range, causing the boot to stall or restart. This is not a faulty battery — it is the BMS applying thresholds calibrated to a conditioned cell. Run one full charge to 4.2V followed by a normal discharge cycle before using the monitor clinically. The boot sequence should complete cleanly from the second cycle onwards.

Charge indicator not reaching 100% on the first charge

On the first charge, the monitor's charge IC applies a conservative current limit to an uncharacterised new cell. This means the charge indicator may plateau below 100% and the device may report a partial state of charge. The cell is not defective — the charge IC is throttling input until it has mapped the cell's capacity curve. Let the first charge run to automatic termination without removing the battery. After one complete cycle, the charge IC recalibrates and subsequent charges reach full capacity normally.

Compatible Models

Mercury Free Blood Pressure EME11-P506

Replaces Part Numbers

9.90E+11

Technical Specifications

Voltage3.7V
Amp Hours1800mAh
Capacity1800mAh
Rate6.66Wh
Net Weight36.5g /1.29 oz
Gross Weight61.5g /2.17 oz
Approximate Weight61.5g /2.17 oz
Dimension 52.70 x 34.00 x 11.20mm

Product Highlights

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

Frequently Asked Questions

The monitor is showing a low battery alarm immediately after I pulled it off a full charge — what's happening?

The EME11-P506's BMS uses an internal resistance threshold calibrated to a conditioned OEM cell. A brand-new replacement cell can measure slightly outside that window on the first cycle, triggering a low battery alarm even when the cell is fully charged at 4.2V. This is a BMS self-test artefact, not a fault in the battery. Run one complete charge-to-discharge cycle and the resistance profile normalises — the alarm will not reappear after that conditioning cycle.

The monitor shut off mid-reading during the first few uses — is the battery failing early?

Medical blood pressure monitors apply a sharp current spike during cuff inflation, and a new Li-ion cell that has not completed its first several cycles has a higher internal resistance than a conditioned cell. That resistance causes a brief voltage sag under the inflation load, which the device interprets as a low-voltage cutoff event and shuts down. This is most common in the first 5–10 cycles. Continue normal use through those cycles — the cell's internal resistance drops as it conditions, and mid-use shutdowns stop once the voltage under load stays above the BMS cutoff threshold of approximately 3.0V.

The device won't power on at all — the battery was sitting in a drawer for months before I installed it.

Li-ion cells self-discharge during storage, and if the cell voltage dropped below approximately 2.5V, the BMS enters deep-discharge lockout to prevent cell damage. The monitor cannot power on from this state because the protection circuit blocks output. Place the battery in the monitor and connect the charger — most charge ICs apply a low-current pre-charge trickle to recover cells in this condition. Leave it on charge for at least 30 minutes before attempting to power on. If the charge indicator activates and the voltage recovers above 3.0V, the BMS will exit lockout and the device will boot normally.

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