BioControl Air Sampler MAS-100 Replacement Battery 10.8V 1800mAh

BioControl Air Sampler MAS-100 — 10.8V Ni-Cd Replacement Battery (110518-U)

This is a 10.8V, 1800mAh Ni-Cd replacement battery for the BioControl MAS-100 microbial air sampler and compatible MAS-AC-6009 and MAS-AC-7009 units. The MAS-100 is a medical-grade instrument used in pharmaceutical and laboratory environments for airborne particle collection and contamination monitoring. It replaces OEM part number 110518-U and matches the original cell chemistry, voltage, and physical footprint.

• MAS-100, MAS-AC-6009, MAS-AC-7009 compatibility: All three models share the same 10.8V battery rail, connector type, and BMS handshake protocol. The pump and collection mechanism draw from the same power circuit, so a single battery specification covers all variants without modification.
• Bench tested on actual hardware: We cycled this battery through the MAS-100's full charge and discharge sequence. The BMS accepted the cell, completed voltage verification, and logged no fault codes after one full cycle.
• Post-swap self-test protocol: After installation, let the device complete its full power-on self-test without interruption. The MAS-100 runs a BMS verification sequence at startup — cutting power during this step logs a false battery fault that persists until the next clean reboot.

BMS learn cycle on first use in the MAS-100

The MAS-100's battery management system calibrates its charge thresholds against the actual cell it detects. A new Ni-Cd cell has not yet completed a calibration cycle, so the BMS applies conservative limits on the first charge. This means the device may show a lower-than-expected state of charge until the first full charge-discharge cycle is complete. Run one full cycle before using the sampler in a scheduled monitoring session — after that, the BMS reports accurately.

Charge indicator stalled below 100% after first installation

On a new Ni-Cd cell, the charge IC in the MAS-100 applies a reduced current limit until it confirms the cell's internal resistance profile. If the indicator stops climbing before 100%, the charge IC has not yet completed its first learning pass. Do not remove the battery — leave it connected and let the charge cycle finish without interruption. Once the first full charge reaches completion, subsequent cycles will reach 100% consistently. Confirm the cell is fully charged by checking for the steady charge-complete indicator rather than the percentage readout alone.