About this replacement
Teleradio TG-TXMNL Transmitter — 3.7V Li-Polymer Replacement Battery (D00004-02)
This 3.7V, 1800mAh Li-Polymer battery is a direct replacement for the Teleradio TG-TXMNL wireless transmitter. It fits the handheld unit used to operate overhead cranes and lifting equipment via wireless control. Rated at 6.66Wh and sized at 68.40 × 42.20 × 14.80mm to seat correctly inside the transmitter housing.
- TG-TXMNL transmitter compatibility: This cell matches the voltage rail and physical footprint of the TG-TXMNL platform. OEM references D00004-02, 22.381.2, M245060, and D4-02 all map to the same cell specification used across the TG-TXMNL transmitter series.
- Bench tested on actual hardware: We ran this cell through charge cycles on the TG-TXMNL transmitter and confirmed the BMS accepted the cell without fault flags. Solenoid activation events during testing did not trigger power dropout at full charge.
- Idle storage charge interval: Crane remotes often sit unused for weeks. Charge this battery at least once per month during idle periods — Li-Polymer cells discharged below 2.5V enter deep-discharge BMS lockout and may not recover even when a charger is connected.
Solenoid activation causing power dropout on a freshly swapped battery
When a crane remote activates a solenoid or relay, there is a short inrush current spike that the battery must supply without the voltage sagging below the BMS cutoff threshold. A cell at storage voltage — typically around 3.6V — has less headroom to absorb that spike than a fully charged cell at 4.2V. The BMS interprets the sag as a fault condition and cuts output to protect the cell. Always charge the replacement battery to full before first use in the transmitter to avoid this trip.
Remote showing low-battery warning immediately after new cell install
Li-Polymer cells ship at storage voltage, typically 3.6–3.7V, not at full charge. The TG-TXMNL transmitter reads cell voltage and displays a low-battery indicator when voltage sits below its threshold, which can trigger even on a brand-new cell straight out of packaging. This is not a faulty battery — it is a cell that has not yet been charged. Connect the transmitter to its charger and bring the cell to 4.2V before treating the indicator as a defect.