Metrohm MIRA XTR Replacement Battery 10.8V 3400mAh

Metrohm MIRA XTR / MIRA P / NanoRAM / TacticID — 10.8V Li-ion Replacement Battery

This 10.8V 3400mAh Li-ion battery replaces the internal pack in the Metrohm MIRA XTR, MIRA P, NanoRAM, and TacticID handheld Raman spectrometers. These instruments share a common battery bay format and voltage rail across the platform. Capacity is sourced from product data at 3400mAh (36.72Wh).

• Shared platform compatibility — MIRA XTR, MIRA P, NanoRAM, TacticID: These four Raman spectrometers use the same 10.8V three-cell Li-ion configuration, matching connector footprint, and compatible BMS handshake protocol. Swapping across models in this family works because the instruments draw from the same voltage rail and expect the same cell-group reporting.
• Bench tested on actual hardware: We ran this pack against a simulated MIRA XTR load profile, including the current spike at laser module initialisation. The BMS held without tripping, and cell voltage balanced correctly through a full discharge-recharge cycle.
• Post-install calibration on Raman instruments: After installing a new pack, run a full instrument calibration cycle through the system menu before taking field measurements. The MIRA XTR maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during your first measurement session, even with a fully charged pack.

BMS cutoff at laser module power-up on the MIRA XTR

The MIRA XTR fires its laser module during instrument initialisation, and this draw spike is the single largest current event the battery sees. A degraded or cold cell pack can't hold voltage through that spike, and the BMS interprets the sag as an undervoltage fault — cutting power before a scan begins. This replacement pack is spec'd to handle that initialisation surge without triggering cutoff. If the instrument shuts off at the exact moment the laser arms, check that cell voltage is above 10.5V before powering on in cold conditions.

Pack not recognised after the instrument sat unused for several months

Li-ion cells that sit discharged below approximately 9V will cause the BMS to enter a deep-sleep protection state. When you insert the pack and press power, the instrument sees no valid battery signal and either ignores it or shows a battery error. Connect the charger before attempting to power on — most BMS circuits will accept a trickle recovery charge and exit sleep mode within 15–30 minutes. Once cell voltage climbs back above 10.0V, the instrument will recognise the pack and boot normally.