SmartMod Pro Tristar Tester Version2.0 Compatible Battery 3.7V 400mAh

SmartMod Pro Tristar Tester Version2.0 — 3.7V Li-Polymer Replacement Battery

This is a 3.7V, 400mAh (1.48Wh) lithium-polymer cell for the SmartMod Pro Tristar Tester Version2.0. It fits directly into the handheld unit and restores full instrument operation when the original cell has degraded. Dimensions are 43.20 × 20.10 × 5.70mm — verify against your existing cell before installing.

• Pro Tristar Tester Version2.0 fitment: The Version2.0 runs a single-cell Li-Polymer pack at 3.7V nominal. The BMS in this instrument monitors cell voltage directly — swapping to a cell outside the original physical envelope or voltage spec causes the instrument to report a battery fault before the first measurement.
• Bench tested on actual hardware: We cycled this cell through probe initialisation events, which pull a brief current spike as the measurement circuit powers up. The BMS did not trip on cold start, and the cell held stable voltage under the sustained sensor load typical of a logging session.
• Post-install calibration on the Pro Tristar Tester Version2.0: After fitting this cell, run a full calibration cycle through the instrument menu before deploying to the field. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session even when the cell is fully charged.

BMS lockout after the Pro Tristar Tester Version2.0 sat unused in a carry case

Li-Polymer cells self-discharge slowly in storage. If the Pro Tristar Tester Version2.0 sat unused for several months, the cell voltage may have dropped below the BMS recovery threshold — typically around 2.5V for a 3.7V nominal cell. At that point the BMS latches into protection mode and the instrument will not power on or accept a charge. Connect the instrument to its charger and leave it for at least 30 minutes before attempting to power on — most chargers trickle current into a locked-out pack to bring it back above the recovery threshold. If the instrument still does not respond after 30 minutes, the original cell has dropped below recoverable voltage and replacement is the only fix.

Pro Tristar Tester Version2.0 shuts down during USB data transfer to a PC

USB data transfer adds a second current draw on top of the active measurement circuit — both the communication stack and the sensor load run simultaneously. On a degraded or partially charged cell, the combined draw causes a voltage dropout that the BMS reads as an undervoltage event, and the instrument cuts power mid-transfer. This is not a firmware fault. Charge the cell fully before any USB session, and check that the transfer cable is not also attempting to draw bus power from the instrument side. A full charge brings the resting cell voltage to approximately 4.2V, which gives enough headroom for the combined load.