About this replacement
TELETRONIC TSM 2002 — 3.6V Ni-MH Replacement Battery (E-0372)
This is a 3.6V, 2100mAh Ni-MH replacement battery for the TELETRONIC TSM 2002 survey and measurement instrument. It carries OEM part number E-0372 and also fits units listed as TSM2002 or P-0372. Capacity figure is taken from the product specification — 7.56Wh total energy.
- TSM 2002 / P-0372 platform compatibility: These model variants share the same 3.6V single-cell Ni-MH architecture, connector pinout, and BMS communication interface. Swapping between them does not require a firmware change or hardware modification.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the TSM 2002 platform and logged BMS handshake behaviour at probe initialisation. The pack held voltage under sustained sensor load without triggering low-voltage cutoff.
- Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the instrument menu before field deployment. The TSM 2002 maps battery state during calibration — skipping this step causes the instrument to report premature low-battery warnings on the first measurement session.
BMS lockout after the TSM 2002 sat unused in a carry case for months
Ni-MH cells self-discharge over time, and if the pack drops below roughly 2.8V during storage, the BMS enters a protective lockout state. In this state the instrument shows no response — no power-on, no charging indication. The fix is to apply a low-current trickle charge using a compatible Ni-MH charger for 20–30 minutes before attempting a normal charge cycle. Once cell voltage recovers above 3.0V, the BMS resets and the instrument recognises the pack normally.
Readings drifting or logging session resetting mid-measurement
This happens when sustained sensor load pulls cell voltage down faster than the BMS expects, triggering a momentary dropout that resets the active logging session. It is not a fault in the instrument — it is a symptom of a cell that can no longer hold voltage under load, even if the battery indicator showed adequate charge. A replacement pack resolves the dropout because fresh cells maintain voltage more consistently under continuous draw. After fitting the new pack, confirm stable voltage during a bench measurement before returning the unit to field use.