{"product_id":"surgitel-eclipse-ehl65-replacement-battery-74v-2600mah-li-ion","title":"SurgiTel Eclipse EHL65 Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSurgiTel Eclipse EHL65 \/ Odyssey Analog — 7.4V Li-ion Replacement Battery (25458)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 2600mAh lithium-ion battery for the SurgiTel Eclipse EHL65 surgical headlight system. It fits the EHL65, EHL-65, and Odyssey Analog loupes-mounted illumination units used in dental and surgical settings. Voltage and connector match OEM spec (part number 25458 \/ OM0134).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEHL65 and Odyssey Analog platform compatibility:\u003c\/strong\u003e\n    Both models share the same 7.4V power rail, battery connector, and BMS handshake protocol — that is why one cell services both. The BMS on each unit checks cell voltage and internal resistance at startup before passing power to the LED driver board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the EHL65 power-on sequence and confirmed the BMS completed its startup verification without triggering a false fault. The LED driver received stable voltage within the expected range across the full charge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eStartup sequence on medical hardware:\u003c\/strong\u003e\n    After installing this battery, allow the EHL65 to complete its full power-on self-test without interruption. The BMS runs a cell-verification routine at boot — cutting power mid-sequence causes a latched fault state that does not clear until the next full cold reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EHL65 reports low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe EHL65 BMS stores a learned discharge profile calibrated to the original cell's internal resistance. A new cell presents a different resistance signature, which the BMS initially reads as a partially depleted pack — even when voltage is at 8.4V fully charged. This is not a fault with the replacement cell. One complete charge-to-discharge cycle allows the BMS to update its learned parameters and clear the alarm. After that first conditioning cycle, low-battery alerts track accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEHL65 fails to power on after the battery sat unused in storage\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge roughly 2–3% per month. A cell stored for several months can drop below the EHL65 BMS recovery threshold — typically around 2.5V per cell, or 5.0V pack voltage — at which point the BMS locks out power delivery as a protection measure. Place the battery on the OEM charger and leave it connected for a minimum of 30 minutes before attempting to power the unit. If the charger shows no activity, the cell may need a brief pre-charge pulse; use only a charger that supports recovery mode for Li-ion cells below 5.0V pack voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381436743770,"sku":"BWCS-STH650MD-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381436776538,"sku":"BWCS-STH650MD-2","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381436809306,"sku":"BWCS-STH650MD-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-STH650MD-1.webp?v=1778900853","url":"https:\/\/batteryweb.com\/products\/surgitel-eclipse-ehl65-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}