TSI 3330 Aerosol Counter Replacement Battery 11.1V 7800mAh

TSI 3330 / 6530-02 / 8240 / 9110 Series — 11.1V Li-ion Replacement Battery

This is an 11.1V, 7800mAh Li-ion replacement battery for TSI aerosol particle counters and environmental monitoring instruments. It fits the TSI 3330, 6530-02, 8240, and 9110 series, plus over twenty additional TSI instrument models. Voltage and capacity match the original pack spec from the product data.

• Cross-model fit on TSI instruments: The 3330, 6530-02, 8240, and 9110 all run the same 11.1V three-cell architecture with a shared connector pinout and BMS handshake protocol. That common platform is why one pack services instruments from optical particle counters to gas detectors across the TSI range.
• Bench tested on actual hardware: We cycled this pack through a simulated sensor-initialisation load sequence, including the current spike that fires when the laser or probe module powers up. The BMS held the rail steady and did not trip into protection mode during startup or sustained sampling loads.
• Pre-deployment calibration step: After installing this pack, run a full calibration cycle through the instrument menu before your first field session. The TSI firmware maps battery state during calibration — skip this and the instrument's low-battery warning will trigger early on the first measurement run, even with a full charge.

BMS lockout after a TSI instrument sat unused in a carry case for months

Li-ion cells self-discharge at roughly 1–3% per month. If a TSI instrument sits in a case for several months with the battery installed, cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or 7.5V across the pack. At that point the BMS enters a deep-sleep lockout state and the instrument will not respond to the power button at all. To recover, connect the battery to a charger that supports a low-voltage precharge mode and hold it there until the pack voltage climbs above 9V, at which point the BMS will re-initialise and accept a normal charge cycle.

TSI instrument shuts down during USB data transfer to PC

USB data transfer adds a second simultaneous load on top of the active sensor array — the combined draw can push total current consumption above what a partially depleted or degraded pack can sustain without a voltage dropout. When the pack voltage sags below the instrument's cutoff threshold, the firmware shuts down to protect the data log. This is not a firmware fault — it is a battery capacity issue. If shutdowns only occur during USB sessions, charge the pack to full before transferring data and confirm resting voltage reads at least 11.8V before connecting the cable.