Medical Research Labs Neuro Probe System 200 12V Replacement Battery 2300mAh

MEDICAL RESEARCH LABS Neuro Probe System 200 / 501 Monitor Defibrillator — 12V Sealed Lead Acid Replacement Battery

This is a 12V 2300mAh (27.6Wh) sealed lead acid replacement battery for the MEDICAL RESEARCH LABS Neuro Probe System 200, Neuro Probe System 300, 501 Monitor Defibrillator, and Porta Pak 500. These are neurological diagnostic and monitoring devices used in clinical and research settings. The battery provides backup power to maintain continuous operation during patient monitoring and neural assessment procedures.

• Multi-model fit — Neuro Probe and Porta Pak platforms: The Neuro Probe System 200 and 300, 501 Monitor Defibrillator, and Porta Pak 500 share the same 12V SLA battery rail, connector form factor, and charge management circuit. A single cell spec covers all four devices without modification.
• Bench tested on actual hardware: We ran this cell through charge and load cycles on the 12V SLA charge profile. The BMS accepted the cell cleanly, held voltage under continuous monitoring load, and showed no cutoff or fault flags across multiple discharge cycles.
• Post-installation self-test protocol: After swapping the battery, allow the device to complete its full power-on self-test without interruption. Medical devices in this class run a BMS verification sequence at startup — cutting power during this window triggers a persistent false battery fault that will not clear until the next complete reboot cycle.

Why the Neuro Probe System 200 alarms low battery immediately after a confirmed full charge

The charge management IC on this device sets its low-battery threshold against the OEM cell's internal resistance profile. A new replacement cell has a different impedance signature until it completes one full charge-discharge cycle. The BMS reads this mismatch as an undervoltage condition and trips the alarm even when the cell is fully charged. Running one complete charge-discharge cycle on the new battery resets the BMS learned threshold and clears the alarm permanently.

Device will not complete boot sequence after battery sat in storage

Sealed lead acid cells self-discharge at roughly 3–5% per month in storage. If the cell drops below approximately 10.5V, the BMS enters a deep-discharge lockout and will not pass enough current to complete the boot sequence. The fix is to connect the device to mains power and allow the charge IC to apply a slow recovery charge — most units in this class apply a trickle at 0.1C until the cell recovers above 11V, then switch to normal charge. Do not attempt to boot from battery until the cell has reached at least 11.8V on the charge display.