Crestron TPMC-4XG-BTP Compatible Battery 3.7V 1700mAh

Crestron TPMC-4XG Touchpanel — 3.7V Li-ion Replacement Battery (TPMC-4XG-BTP)

This 3.7V 1700mAh Li-ion battery replaces the OEM cell in the Crestron TPMC-4XG tabletop touchscreen control panel. It fits the TPMC-4XG, TPMC-4XG-B, TPMC-4XG Touchpanel, and A0356 variants. Swap it in when the original no longer holds charge or the panel loses wireless control capability between sessions.

• TPMC-4XG platform fit: All listed variants — TPMC-4XG, TPMC-4XG-B, and A0356 — share the same battery bay dimensions, connector pinout, and 3.7V charging circuit. One cell SKU covers the whole family without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the TPMC-4XG platform. The BMS accepted the cell without fault flags, reached full charge voltage at 4.2V, and the panel resumed wireless communication without requiring a re-pair sequence.
• Single-cell replacement rule: The TPMC-4XG runs on one internal Li-ion cell. Do not leave the old partially degraded cell installed alongside a new one — remove the original completely before fitting this replacement. A mismatched cell left in circuit will skew charge balance and shorten the new cell's cycle life.

Why the TPMC-4XG drops wireless connection before the battery indicator warns you

The TPMC-4XG's battery gauge reads state-of-charge from a voltage curve, not a coulomb counter. As Li-ion cells age, internal resistance rises and the resting voltage stays artificially high — so the panel reports 30–40% remaining while actual usable capacity has dropped sharply. Under the transmit load of a wireless burst, voltage sags below the radio module's minimum rail and the connection drops. The panel may recover seconds later as voltage rebounds, which makes the fault look intermittent. If your panel drops connection mid-use but shows battery remaining, the cell's internal resistance has risen enough to fail under load — replace it.

Touchpanel powers on but wireless control stops responding after a few button presses

This symptom — a live display but dead control output — points to a cell that can sustain idle draw but not the current spike of repeated wireless transmissions. Each button press triggers a radio burst that pulls more current than the screen does at rest. A degraded cell collapses in voltage under that burst, the radio drops out, and the panel appears frozen to the user. Check resting voltage on the cell before condemning the panel: a healthy Li-ion cell sits at 3.7V or above at rest. Below 3.5V at rest, replace the cell before assuming a panel fault.