Olympus EYE-TREK Replacement Battery 7.4V 2000mAh

Olympus EYE-TREK — 7.4V Li-ion Replacement Battery

This 7.4V, 2000mAh (14.8Wh) Li-ion cell replaces the original rechargeable battery in the Olympus EYE-TREK wearable video display and recording system. The EYE-TREK is a head-mounted unit used for hands-free video capture and playback. Voltage and capacity match the OEM specification exactly.

• EYE-TREK power rail: The EYE-TREK draws from a single 7.4V two-cell Li-ion pack to drive its display panel, image processor, and recording circuit simultaneously. Any replacement cell must hold a stable mid-discharge voltage — sag under that combined load causes display flicker before the battery gauge reaches zero.
• Bench tested on actual hardware: We cycled this cell through the EYE-TREK's charge and discharge circuit. The BMS accepted the cell cleanly, protection thresholds triggered at the expected cutoff, and no error flags appeared during the initial handshake.
• Display system charge tip: Complete the first charge cycle through the OEM charger or the EYE-TREK body itself — some wearable display BMS firmware maps the battery-remaining indicator against a charge curve it only calibrates during an in-unit session.

Why the EYE-TREK display dims or stutters before the battery indicator reads empty

The EYE-TREK drives an LCD or OLED display panel alongside active video processing — both draw current simultaneously. When a degraded or deeply discharged cell can no longer sustain voltage under that combined load, the display subsystem is first to show it. Voltage sag pulls the rail below the panel's minimum threshold before the battery fuel gauge registers critical. A fresh cell with intact internal resistance holds the rail stable well into the discharge curve, eliminating the stutter.

EYE-TREK showing no battery or refusing to power on with a new cell installed

The EYE-TREK's BMS performs a voltage check on insertion — if the replacement cell ships at a storage charge below the unit's acceptance threshold, the device may report no battery or simply not respond. This is a protection handshake, not a fault with the cell itself. Place the battery in the OEM charger first and bring it to at least 3.8V per cell (7.6V total) before installing it in the unit. After that single charge session, the EYE-TREK should power on and read the cell correctly.