About this replacement
Crestron TPMC-3X Touchpanel — 3.7V Li-Polymer Replacement Battery (TPMC-3X-BTP)
This is a 3.7V, 1000mAh Li-Polymer battery for the Crestron TPMC-3X Touchpanel. It also fits the PTX3, MTX-3, and Prodigy PTX3 control panels. These panels share the same battery footprint and connector, so one part number covers the full range.
- TPMC-3X and PTX3 series compatibility: All listed models run the same 3.7V single-cell Li-Polymer architecture with an identical connector pinout and BMS handshake. The control panel's firmware recognises the battery state over the same data line across every model in this group.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a TPMC-3X unit and confirmed the BMS accepted the pack without fault codes. Cell voltage held within spec at full charge and the protection circuit tripped correctly at the low-voltage threshold.
- Connector seating on reinstall: The TPMC-3X housing has limited clearance around the battery connector. Press the connector straight down until it clicks — angled insertion bends the pins and causes intermittent power loss that looks like a dead cell.
Why the TPMC-3X shows low battery warning sooner than expected after replacement
The TPMC-3X reads battery state through a fuel gauge IC, not just terminal voltage. If the new cell isn't fully charged before first use, the fuel gauge calibration starts off-kilter and reports depletion early. Charge the panel fully before the first session — the gauge recalibrates over the first complete charge and discharge cycle. After that cycle, the low-battery indicator should trigger accurately at the correct voltage threshold.
Touchpanel powers on but drops off seconds after disconnecting from dock
This happens when the battery connector isn't fully seated and the panel draws current from the dock rather than the cell. The moment you pull the cable, there's no current path and the panel shuts down. It isn't a dead battery — it's a connection fault. Re-open the housing, disconnect and firmly reseat the battery connector, then confirm the panel holds power off-dock before closing the case. A properly seated connector should bring standby voltage to a stable 3.7V.