Samson ATX Wireless Transmitter Compatible Battery 3.7V 400mAh

Samson ATX Wireless Transmitter — 3.7V Li-Polymer Replacement Battery (1-HJ00046)

This 3.7V, 400mAh lithium-polymer cell replaces the original battery in the Samson ATX wireless transmitter. It fits the ATX portable transmitter unit used in Samson's wireless headset system. Voltage and capacity match the OEM spec exactly — 3.7V nominal, 1.48Wh total energy.

• ATX transmitter fit: The ATX transmitter runs a single Li-Polymer cell at 3.7V to power both the audio capture circuit and the RF transmission stage simultaneously. The connector pinout and BMS communication protocol must match the original cell — this replacement uses the same configuration as part 1-HJ00046.
• Bench tested on actual hardware: We cycled this cell under combined audio and RF load. The BMS handled the dual-draw profile without tripping the overcurrent cutoff, and the cell held voltage across the discharge curve without sag-induced dropouts.
• First-cycle charging in the transmitter: Seat the new cell in the transmitter and run a full charge cycle before use. The ATX system logs the new cell's state-of-charge baseline on that first cycle — skipping it causes the transmitter to misread remaining capacity from the first use.

Why the ATX transmitter cuts out mid-performance on a fresh battery

The ATX transmitter draws current from two subsystems at once — the mic preamp and the RF stage. On a cell that hasn't completed its first full charge cycle, the resting voltage sits below the BMS's operating floor. Under peak RF transmission load, the voltage sags just enough to trigger the protection circuit, cutting the unit off. Running one complete charge-discharge cycle brings the cell to its rated capacity baseline and stops this happening.

Talk time noticeably shorter than rated on the first few uses

Li-Polymer cells ship at storage voltage — around 3.6V — not full charge. On the first two or three cycles, the cell hasn't reached its full electrochemical capacity yet. Talk time improves progressively over three to five full charge-discharge cycles as the cell conditions. By cycle five, output should be consistent with the 400mAh rated capacity.