About this replacement
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.