{"product_id":"vision-led-daylite-replacement-battery-74v-2600mah-li-ion","title":"Vision LED DayLite Replacement Battery 7.4V 2600mAh DVI-LEDS","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVision LED DayLite Series — 7.4V Li-ion Replacement Battery (DVI-LEDS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V, 2600mAh Li-ion battery replaces the OEM pack in the Vision LED DayLite and LED DayLite HDi medical headlights. These are clinical-grade portable illumination systems used in examination and procedural settings. This listing covers OEM part numbers DVI-LEDS, DVI-LEDSC, and OM0046.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLED DayLite and HDi compatibility:\u003c\/strong\u003e\n    Both the standard DayLite and the HDi share the same 7.4V two-cell Li-ion architecture, connector footprint, and BMS handshake protocol — one battery serves both units without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the DayLite's startup self-test sequence and confirmed BMS communication cleared correctly. The charge IC applied a conservative limit on the first charge cycle, which is normal — capacity reached rated output after the second full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the DayLite to complete its full power-on self-test without interruption. Medical BMS firmware verifies cell chemistry at startup — cutting power mid-sequence flags a persistent battery fault that only clears on a full reboot with an uninterrupted cycle.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DayLite triggers a low-battery alarm on a freshly charged replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe DayLite's BMS compares the incoming cell's voltage response curve against a stored OEM profile during startup. A new cell that hasn't completed at least one full charge-discharge cycle presents a slightly different internal resistance signature. The BMS interprets this mismatch as a degraded pack and trips the low-battery threshold early. Run one complete charge-discharge cycle before clinical use and the alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDayLite won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the pack drops below approximately 2.5V per cell — 5.0V total — the BMS enters protection lockout and blocks load output entirely. The device appears completely dead even though the hardware is intact. Place the battery on charge for a minimum of 30 minutes before attempting to power on; most chargers apply a trickle pre-charge to recover cells sitting in this range and will resume normal charging once the pack reaches 6.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381374648410,"sku":"BWCS-DRN046MD-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381374681178,"sku":"BWCS-DRN046MD-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381374713946,"sku":"BWCS-DRN046MD-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DRN046MD-1.webp?v=1778900351","url":"https:\/\/batteryweb.com\/products\/vision-led-daylite-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}