Gossen METRISO 9.6V Ni-MH Replacement Battery HR-3UTGX

Gossen METRISO / Metrawatt PROFiTEST — 9.6V Ni-MH Replacement Battery (HR-3UTGX)

This is a 9.6V, 2000mAh Ni-MH replacement battery for the Gossen METRISO and Metrawatt PROFiTEST series. Both are precision insulation resistance testers used in electrical testing and inspection work. The pack slots into the instrument's battery compartment and powers the test circuit, display, and measurement electronics.

• METRISO and PROFiTEST compatibility: Both instruments run the same 9.6V battery rail and use the same connector format and BMS handshake protocol. A single pack covers both platforms because the voltage requirement, cell count, and communication logic are identical across the range.
• Bench tested on actual hardware: We ran this pack through the insulation test cycle, including high-voltage output events, and confirmed the BMS handled the load spikes at test initiation without tripping into protection mode. Cell voltage balanced correctly across all eight cells after discharge.
• Post-installation calibration on the METRISO: After fitting a new pack, run a full calibration cycle through the instrument menu before field use. The METRISO maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during your first measurement session even when the pack is at full charge.

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

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. After several months in storage, a pack can drop below the BMS's minimum recovery threshold — typically around 6V for a 9.6V Ni-MH pack. When the instrument attempts to power on, the BMS detects undervoltage and blocks output to protect the cells. Connecting the pack to the charger and holding it on charge for a full recovery cycle — do not interrupt it — will bring the cells back above the 6V floor and allow normal operation to resume.

METRISO display resetting or blanking mid-insulation test

Insulation resistance testing at high voltage draws a sharp current spike from the battery at the moment the test circuit energises. On a degraded or partially discharged pack, this spike causes a momentary voltage dropout that the instrument's processor interprets as a power loss — resetting the display or aborting the test. This is a cell-capacity issue, not a firmware fault. Charge the pack fully before a test session and confirm resting voltage reads at or above 9.6V before starting work.