Matco Tools TPMS3.0 Replacement Battery 7.4V 2100mAh

Matco Tools Maximus TPMS3.0 / MAXTPMS 2.0 — 7.4V Li-Polymer Replacement Battery

This 7.4V 2100mAh lithium-polymer pack replaces the internal battery in the Matco Tools Maximus TPMS3.0, MAXTPMS 2.0, MDMAXTPMS2, and MDMAXTPMS3G handheld TPMS diagnostic tools. These are portable, technician-grade devices used to activate, program, and relearn TPMS sensors at the wheel. Dimensions are 68.00 × 50.00 × 10.30mm — verify fitment against the existing cell before installing.

• Cross-model fitment — TPMS3.0 and MAXTPMS 2.0 series: Both generations of the Maximus TPMS platform share the same 7.4V cell form factor, connector pinout, and BMS handshake protocol. A single replacement covers the MDMAXTPMS2 and MDMAXTPMS3G variants without modification.
• Bench tested on actual hardware: We cycled this pack through sensor activation sequences and relearn procedures on the TPMS3.0 platform. The BMS maintained stable voltage delivery through repeated RF burst transmissions during sensor wake-up — no cutoff events under normal operating load.
• Post-install calibration on the TPMS tool: After fitting this battery, run a full vehicle relearn sequence before field use. The TPMS3.0 maps cell state during active sensor sessions, and skipping this step causes the low-battery indicator to trigger prematurely on the first job.

BMS cutoff during sensor initialisation on the TPMS3.0

When the TPMS3.0 activates a sensor, it fires a low-frequency RF burst that draws a short current spike from the battery. On an aged or partially discharged cell, this spike can push the instantaneous draw past the BMS overcurrent threshold. The tool shuts off mid-activation — not because the battery is empty, but because the BMS tripped on peak current. A fresh cell with healthy internal resistance handles the spike without triggering cutoff. If you see this on a new pack, ensure the battery is charged above 7.8V before attempting sensor activation cycles.

Battery percentage jumping around at startup after the tool sits unused

If the TPMS tool sits in a case for several weeks, the cell self-discharges and the tool's voltage-threshold indicator loses its reference point for the new cell's discharge curve. At power-on, the display may show 80% then drop to 30% within the first few activations. This is the indicator recalibrating to the actual resting voltage — not a fault with the pack. Run two or three full sensor activation sessions back-to-back and the percentage reading will stabilise. If the tool refuses to power on after extended storage, charge for at least 30 minutes before attempting a restart.