X-Rite SE15-44 Replacement Battery 7.4V 2600mAh Li-ion

X-Rite SE15-44 / eXact Series — 7.4V Li-ion Replacement Battery (XRSE1544)

This 7.4V 2600mAh Li-ion pack replaces the OEM XRSE1544 battery in X-Rite portable spectrophotometers. It fits the SE15-44, SE15-46, eXact, and eXact Advance instruments used in colour measurement, print verification, and QC workflows. Voltage and capacity match OEM spec exactly — 7.4V, 2600mAh (19.24Wh).

• SE15-44, SE15-46, eXact, and eXact Advance compatibility: These models share the same battery bay format, connector pinout, and BMS handshake protocol, which is why a single pack covers the full range. Swapping between them requires no modification.
• Bench tested on actual hardware: We ran the pack through full charge and discharge cycles with measurement and data-logging loads active. The BMS held steady through repeated sensor-illumination pulses without tripping or dropping voltage below the instrument's low-battery threshold.
• Post-install calibration step: After fitting this battery, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this causes premature low-battery warnings to appear on the first measurement session even with a full charge.

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

Li-ion cells in spectrophotometer packs self-discharge slowly during storage. If the pack voltage drops below roughly 2.5V per cell, the BMS enters a protective lockout state and blocks charge current entirely. Placing the battery on a standard charger at this point shows no charging activity — the instrument may not even power on to display an error. To recover, use a charger with a trickle or recovery mode that applies a low current (around 0.1C) until the pack climbs back above 3.0V per cell, then continue with a normal charge cycle.

Readings resetting or dropping out mid-logging session

During sustained data-logging, the spectrophotometer draws current continuously from the sensor array, display, and processor simultaneously. If cell impedance has risen — common in aged packs — voltage sags briefly under this combined load, crossing the instrument's undervoltage cutoff and triggering a reset or measurement abort. The fix is straightforward: replace the pack rather than recharge it, since an impedance problem does not recover with charging. After fitting the new pack, confirm voltage at the battery contacts reads at or above 7.4V before starting a logging session.