WP-CVI-03 Particle Measuring Systems AC100 Replacement Battery 14.4V 6400mAh

Particle Measuring Systems AC100 / Minicapt 100 — 14.4V Li-ion Replacement Battery (WP-CVI-03)

This 14.4V, 6400mAh Li-ion battery replaces OEM part WP-CVI-03 in the Particle Measuring Systems AC100, AC100H, and Minicapt 100 portable aerosol particle counters. These instruments are used in cleanroom surveys, pharmaceutical facility audits, and ISO compliance testing where uninterrupted monitoring matters. Voltage and capacity match the original pack to keep the instrument's sampling and data-logging functions running without interruption.

• AC100, AC100H, and Minicapt 100 compatibility: All three models share the same 14.4V battery architecture, connector pinout, and BMS communication protocol. A single replacement pack covers the full platform — no model-specific variants needed.
• Bench tested on actual hardware: We ran this pack through the AC100's probe initialisation sequence, where the laser diode and optical sensor draw a brief current spike at power-up. The BMS handled the surge without tripping into protection mode, and the instrument accepted the pack without a battery-fault flag.
• Pre-deployment calibration cycle: After fitting this pack, run a full calibration cycle through the instrument's menu before your first field session. The AC100 maps battery state during calibration — skip this step and the low-battery warning can trigger early on the first measurement run, even with a full charge.

BMS lockout after the AC100 sat unused in a carry case for months

Li-ion cells in instruments stored for extended periods can self-discharge below the BMS recovery threshold — typically around 2.5V per cell. When that happens, the BMS latches into deep-discharge protection and the instrument either shows no battery indication or refuses to power on. Connecting the charger immediately and leaving it for 60–90 minutes without interruption usually wakes the BMS. If the charger LED does not respond after 90 minutes, disconnect, wait two minutes, then reconnect — this resets the charger's handshake with the pack's protection circuit.

AC100 shuts down mid-measurement with no low-battery warning

This happens when the instrument's sustained sensor load — laser diode, pump motor, and active display running simultaneously — pulls the pack voltage below the BMS cutoff threshold faster than the indicator updates. The shutdown is abrupt because the BMS acts before the display's voltage-averaging routine registers the drop. It is more common with a partially degraded cell that holds a surface charge but collapses under real load. Charge the pack fully, then check the instrument's battery status screen immediately after a cold boot — a rested voltage below 15.2V on a "full" pack points to cell degradation.