FLIR FX Thermal Camera Replacement Battery 3.7V 800mAh

Flir FX / FXV101 Series — 3.7V Li-ion Replacement Battery (G713140AJ)

This 3.7V 800mAh Li-ion cell replaces the original G713140AJ battery in the Flir FX, FXV101, and FXV101-WV1 wireless security cameras. The FX is a compact home monitoring camera that runs continuous or motion-triggered recording. A depleted or degraded original cell is the most common reason these cameras drop offline or stop logging events.

• FX and FXV101 platform fit: All three models share the same 3.7V cell footprint, connector pinout, and BMS handshake protocol — one cell covers the full range without any wiring changes.
• Bench tested on actual hardware: We cycled this cell through simulated motion-event bursts — the combined IR LED and processor current spike during trigger events — and confirmed the BMS held voltage without tripping cutoff under repeated load.
• First-install power cycle: After fitting the new cell, power cycle the camera once through the Flir app. The firmware needs to register the new cell before motion events log correctly to cloud storage — skipping this step can cause missed clips even when the camera appears online.

App showing 0% or incorrect battery percentage after installing the G713140AJ cell

The Flir FX uses a voltage-threshold indicator, not a fuel gauge IC. When a new cell is installed, the camera's firmware reads the resting voltage and maps it to a charge percentage — but that mapping only calibrates correctly after one full charge and discharge cycle. An out-of-box cell sitting at storage voltage (typically 3.6–3.7V) can register as 0% or an arbitrary number until the cycle completes. Charge the camera to 100% via the app indicator, let it run through a full session, then recharge fully. The percentage display stabilises after that single cycle.

Recording stops mid-clip on the FXV101 when WiFi signal is weak

When the FXV101 loses and then re-acquires a weak WiFi signal, the reconnect handshake draws a short current spike that can push total draw — processor plus IR LEDs plus radio — past the BMS overcurrent threshold. The BMS trips, the cell disconnects briefly, and the clip ends. This happens more often with aged cells whose internal resistance has risen, but it can also occur with a new cell if the WiFi signal is marginal. Move the camera closer to the access point or add a mesh node within range — target a signal level that keeps reconnect attempts below one per recording session.