FLIR ThermaCam E2 7.4V Replacement Battery T198258 3400mAh

Flir ThermaCam E2 / ThermaCAM EX320 — 7.4V Li-ion Replacement Battery (T198258)

This 7.4V, 3400mAh Li-ion battery replaces the original pack in the Flir ThermaCam E2 and ThermaCAM EX320 thermal imaging cameras. It also fits the E65 and a further eleven compatible models that share the same battery bay and connector configuration. OEM cross-references include T198258, T199366, 1195106, and 1195106-05.

• ThermaCam E2 and EX320 platform fit: These models share a common 7.4V battery rail, identical physical footprint, and the same BMS communication handshake with the camera's power management board — one pack covers the full group.
• Bench tested on actual hardware: We ran this cell under simultaneous detector heater and LCD display load. The BMS held voltage above the 6.8V threshold throughout the combined draw cycle without triggering early cutoff.
• Thermal detector warm-up — don't skip it: After powering on with a fresh battery, allow 60 seconds before taking any measurements. The infrared detector requires the internal electronics to reach thermal equilibrium — skipping this step produces inaccurate baseline readings regardless of charge level.

Thermal camera shutting down mid-inspection on a new battery

The ThermaCam E2 draws current from two parallel loads: the continuous detector heating element and the backlit display. Together these can spike combined draw high enough to trigger the BMS's over-current protection, especially in cold ambient conditions where internal resistance rises. A cell with marginal capacity handles this surge poorly — voltage sags below the cutoff threshold and the camera powers off without warning. This replacement pack's 3400mAh capacity provides enough headroom to sustain both loads simultaneously through a full field session.

Thermal accuracy degrading before the battery indicator shows low

The E2's infrared detector is voltage-sensitive. As cell voltage drops from 7.4V toward 7.0V, the detector heater receives less stable current, and the camera's temperature measurement error margin widens — this happens well before the on-screen battery indicator flags a low charge warning. If readings start drifting or hot spots appear inconsistently, check actual cell voltage rather than trusting the gauge. Swap or recharge once you measure below 7.1V at the pack terminals.