Critikon 8700 Monitor Replacement Battery 12V 2300mAh SLA

Critikon 8700 / 8720 Monitor Series — 12V Sealed Lead Acid Replacement Battery

This is a 12V 2300mAh sealed lead-acid battery for the Critikon 8700, 8700T, 8710, and 8720 vital signs monitors, plus 17 additional compatible models in that range. These monitors are portable clinical devices used for blood pressure, heart rate, and SpO2 measurement at the bedside. The battery slots into the monitor's internal bay and powers the unit during patient assessments away from mains supply.

• 8700 series shared battery platform: The 8700, 8700T, 8710, and 8720 share the same 12V sealed lead-acid form factor and connector orientation. The BMS in each model communicates with the battery via the same charge management circuit, so one cell chemistry and capacity spec covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through the Critikon charge circuit and confirmed the BMS accepted the new cell, completed charge acceptance, and did not flag a chemistry mismatch fault. Voltage held within spec across a controlled discharge profile at clinical load levels.
• Post-installation self-test protocol: After fitting this battery, let the monitor complete its full power-on self-test without interrupting it. The Critikon BMS runs a verification sequence at startup — cutting power mid-cycle causes a latching battery fault that will persist until the next complete reboot cycle.

Why the Critikon 8700 alarms low battery immediately after a confirmed full charge

The monitor's BMS compares cell behaviour against a stored threshold profile calibrated to the original factory cell. A new sealed lead-acid cell has not yet completed a full charge-discharge cycle, so its internal resistance reading sits outside the expected window. The BMS interprets this as a degraded or low cell and trips the alarm before the cell is actually depleted. Running one complete charge-to-discharge cycle allows the BMS to update its reference point and clear the false low-battery condition. After that first cycle, the alarm threshold aligns with the actual cell state.

Monitor will not power on after battery sat unused in storage

Sealed lead-acid cells self-discharge over time. If the battery dropped below approximately 10.5V during storage, the Critikon BMS may refuse to initiate a charge cycle as a protection measure against deeply discharged cells. Connect the monitor to mains and leave it on charge for a minimum of 24 hours before attempting to power on. This gives the charge circuit time to apply a recovery trickle before handing off to the main charge stage. If the monitor still won't power on after 24 hours on charge, check that wall voltage is reaching the charge port — a faulty AC adapter will produce the same symptom.