MetOne Lasair III 110 Replacement Battery 14.4V 6800mAh NH2034

MetOne Lasair III 110 — 14.4V Li-ion Replacement Battery (NH2034)

This 14.4V, 6800mAh Li-ion battery replaces the OEM pack in the MetOne Lasair III 110 handheld particle counter. It fits the portable aerosol detection unit used in cleanroom surveys, environmental monitoring, and industrial air quality assessments. Voltage and cell count match the original specification exactly.

• Lasair III 110 platform fit: The Lasair III 110 uses a 14.4V four-cell series configuration with a dedicated BMS that handshakes with the instrument's firmware. Both OEM part numbers NH2034 and NH2034HD31 cross-reference to this pack. The connector pinout and BMS communication lines are retained so the instrument reads charge state correctly.
• Bench tested on actual hardware: We cycled this pack through the Lasair III 110's sensor initialisation sequence, which pulls a brief current spike as the laser diode and pump motor spin up simultaneously. The BMS held the rail steady through that load event and did not trip into protection mode.
• First-use calibration cycle: After installing this battery, run a full calibration cycle through the instrument menu before field deployment. The Lasair III 110 maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session, even when the pack is fully charged.

BMS lockout after the Lasair III 110 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the Lasair III 110 sits unused long enough, the pack voltage drops below the BMS recovery threshold — typically around 10.0–10.5V for a 14.4V nominal pack — and the BMS latches into deep-discharge lockout to protect the cells. In this state, the instrument shows no response and the charger may not register the pack at all. Connect the battery to the OEM charger and leave it for 30–60 minutes; most BMS circuits include a trickle pre-charge routine that recovers the pack once it senses a charge source, then resumes normal charging automatically.

Voltage dropout causing readings to reset mid-logging session

During a sustained logging run, the Lasair III 110 keeps the laser diode, pump motor, and onboard processor active simultaneously — a combined load that can drag pack voltage down faster than idle display use suggests. If the voltage dips below the instrument's cutoff threshold even briefly, the firmware resets the active session and returns to the home screen, losing unsaved count data. This is not a capacity failure — it is a voltage sag event under sustained load, more common in aged cells. Replacing a degraded pack with a fresh 6800mAh unit restores the voltage headroom needed to sustain the full draw without dropout.