{"product_id":"olympus-eye-trek-replacement-battery-74v-2600mah-li-ion","title":"Olympus EYE-TREK Compatible Battery 7.4V 2600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOlympus EYE-TREK — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh (19.24Wh) lithium-ion cell is a direct replacement for the Olympus EYE-TREK head-mounted wearable camera. The EYE-TREK records hands-free photo and video, and the original battery degrades noticeably after repeated charge cycles. This replacement restores full operating voltage to the device.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEYE-TREK platform fit:\u003c\/strong\u003e\n    The EYE-TREK uses a 7.4V two-cell Li-ion pack with a specific connector and BMS communication line. Any replacement must match both voltage and physical format — 70.80 x 38.50 x 23.20mm — to seat correctly and allow the camera body to read state-of-charge accurately.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the EYE-TREK platform. The BMS accepted the cell on first install, reported state-of-charge without error flags, and held voltage within the expected discharge curve across the full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the EYE-TREK:\u003c\/strong\u003e\n    Run one complete charge cycle through the OEM charger or camera body before heavy recording sessions. The EYE-TREK BMS maps its battery-remaining indicator to a discharge curve it calibrates on that first cycle — skipping it causes inaccurate percentage readings throughout the battery's life.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EYE-TREK shows a dead battery indicator on a partially charged replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe EYE-TREK reads remaining charge by mapping terminal voltage to a pre-loaded discharge curve stored in the BMS. A new cell with no calibration history can sit at 7.8V and still trigger a low-battery warning because the BMS hasn't yet established where that voltage falls on its own curve. This is not a faulty cell — it's a calibration gap. One full charge cycle from within the camera body or OEM charger resets this mapping. After that cycle, the indicator tracks actual charge state correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically during EYE-TREK recording\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eErratic percentage jumps — for example, dropping from 60% to 20% mid-session then recovering — happen when the BMS voltage thresholds don't yet match the new cell's discharge curve. New lithium-ion cells have a slightly flatter mid-range voltage profile than a worn original, so the camera misreads transitions between charge bands. This is a software-side mapping issue, not a hardware fault. Fully discharge the cell to the camera's auto-shutoff point, then charge to 100% in one uninterrupted cycle — after that reset, the percentage display stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333594185818,"sku":"BWCS-F550MU-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333594218586,"sku":"BWCS-F550MU-2","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333594251354,"sku":"BWCS-F550MU-3","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-F550MU-1.webp?v=1778212975","url":"https:\/\/batteryweb.com\/products\/olympus-eye-trek-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}