{"product_id":"cateye-hl-el625rc-replacement-battery-37v-2800mah-li-ion","title":"CATEYE HL-EL625RC Replacement Battery 3.7V 2800mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCATEYE HL-EL625RC — 3.7V Li-ion Replacement Battery (BA-625)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2800mAh Li-ion replacement for the CATEYE HL-EL625RC bicycle headlight. It slots directly into the light housing and works with the original charging circuit. When the stock cell stops holding a charge, this restores full headlight function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHL-EL625RC compatibility:\u003c\/strong\u003e\n    The BA-625 uses the same voltage rail and physical footprint as the factory cell. The light's driver circuit communicates directly with the battery's protection board — no firmware mismatch, no false low-battery warnings on a fresh charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the HL-EL625RC's full charge cycle. The BMS accepted charge without interruption, cell voltage reached 4.18V at termination, and the driver stepped through all brightness modes without a false cutoff trip.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-ride charge habit for the HL-EL625RC:\u003c\/strong\u003e\n    Charge the light fully before a night ride. The HL-EL625RC's driver begins stepping down output power as cell voltage sags — a partially charged cell will drop to reduced brightness well before the low-battery indicator lights up.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HL-EL625RC dims before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe HL-EL625RC uses a constant-current driver that monitors cell voltage in real time. As the Li-ion cell discharges from 4.2V toward 3.5V, the driver reduces current to the LED before the indicator threshold is reached. This is normal driver behaviour, not a fault. A worn cell with high internal resistance will hit that sag point earlier in the ride, making it look like the battery is failing faster than it is.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLight not reaching rated lumen output after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the headlight runs noticeably dimmer than expected after fitting a new cell, check that the battery reached a full charge before use — the driver needs cell voltage above 4.0V to sustain maximum brightness mode. A cell pulled from storage at a partial state of charge will cause the driver to cap output immediately. Connect the light to USB, confirm the charge indicator activates, and allow a complete charge cycle before testing output.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333502369882,"sku":"BWCS-CHL625SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333502402650,"sku":"BWCS-CHL625SL-2","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333502435418,"sku":"BWCS-CHL625SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CHL625SL-1.webp?v=1778212808","url":"https:\/\/batteryweb.com\/products\/cateye-hl-el625rc-replacement-battery-37v-2800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}