About this replacement
Midland BTX2 Pro / BTX1 Pro Series — 3.7V Li-Polymer Replacement Battery (YT502262)
This 3.7V 750mAh Li-Polymer cell replaces the YT502262 battery in the Midland BTX2 Pro, BTX2 Pro S, BTX1 Pro, and BTX1 Pro S wireless motorcycle headsets. The original cell degrades with repeated charge cycles, cutting call time short and causing mid-ride dropouts. Swapping this cell restores the headset to factory power capacity.
- BTX Pro series fit: The BTX2 Pro and BTX1 Pro share the same 3.7V power rail, YT502262 footprint, and BMS handshake protocol — that is why one cell fits across both lines. The connector orientation and cell dimensions (60.70 × 22.00 × 5.00mm) are identical across the series.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the BTX2 Pro platform. The BMS accepted the new pack without error flags, and the protection circuit triggered correctly at the low-voltage cutoff threshold.
- First-cycle headset registration: Seat the headset in its charging cradle and complete one full charge before using it. The BTX Pro base station logs the new cell's capacity on that first cycle — skip it and the talk-time indicator will read inaccurately for the first several uses.
Why the BTX2 Pro cuts out mid-call on a new battery
The BTX2 Pro draws simultaneously from the audio amplifier and the Bluetooth radio during a call. That combined load creates a brief voltage sag that the BMS can misread as a low-cell condition, tripping the protection circuit. A fresh cell at storage voltage (around 3.6–3.7V) is more prone to this than one that has completed two or three full charge cycles. Running three full charge-discharge cycles brings the cell to stable operating voltage and reduces sag trips.
Base station showing a charging error after fitting a new cell
The BTX Pro cradle handshakes with the battery BMS before it starts the charge current. If the new cell arrives at deep storage voltage, the base may not complete that handshake and will flag an error LED instead of charging. Connect the headset to the cradle, leave it for 10–15 minutes without disturbing it, and let the BMS pre-charge circuit bring the cell up to 3.0V. Once that threshold is reached, the base station recognises the pack and switches to normal CC/CV charging.