Deviser DS2002 Replacement Battery 3.6V 2500mAh Ni-MH

Deviser DS2002 / DS2002H — 3.6V Ni-MH Replacement Battery (30254)

This 3.6V 2500mAh Ni-MH battery replaces the OEM 30254 pack in the Deviser DS2002 and DS2002H digital theodolite and total station. It powers the instrument's electronic angle measurement, display, and data recording functions. Capacity is 2500mAh (9Wh), matching the original specification.

• DS2002 and DS2002H fit: Both models use the same 3.6V single-cell Ni-MH platform, share the same physical pack dimensions (50.50 × 50.30 × 17.25mm), and accept the same connector and BMS handshake — one battery covers both variants.
• Bench tested on actual hardware: We cycled this pack through instrument power-up, angle measurement, and data logging sequences. The BMS held stable voltage through sensor initialisation spikes and did not trip during sustained electronic load.
• Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the DS2002 instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even with a fully charged pack.

BMS lockout after the DS2002 sat unused in a carry case for months

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A DS2002 left in a case for three or more months can drop the pack below the BMS recovery threshold — typically around 2.8–3.0V for a 3.6V cell. When this happens, the instrument either shows no battery indicator or fails to power on entirely, even after placing it on the charger. To recover, connect the pack to the OEM charger and leave it for a full charge cycle without interrupting — most BMS controllers re-initialise once the cell voltage climbs back above the recovery threshold.

DS2002 readings resetting or drifting mid-logging session

This is not a measurement error — it is a voltage dropout under sustained sensor load. When a degraded or partially charged Ni-MH pack cannot maintain voltage during continuous angle sampling and data recording, the processor briefly resets, clearing the active measurement buffer. The display may return to a home screen or show a corrupted last reading. Check resting voltage before field use — a healthy 3.6V Ni-MH cell should read 1.35–1.40V per cell at rest after a full charge; if the pack reads below 3.9V immediately off the charger, replace it.