{"product_id":"eunorau-flash-extra-battery-52v21ah-2nd-52v17ah-3rd-both-52v-21ah-hyfx-d-ra4-third-17ah-battery","title":"Eunorau | Flash Extra Battery 52V21Ah (2nd) | 52V17Ah (3rd) | Both | 52V-21AH-HYFX-D-RA4 - Third 17AH Battery","description":"\u003ch3\u003eEunorau | Flash Extra Battery 52V21Ah (2nd) | 52V17Ah (3rd) | Both\u003c\/h3\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eTwo reliable lithium-ion battery options designed for the Eunorau Flash: a higher-capacity 52V 21Ah down-tube pack using HYFX-D LG3500 cells and a lighter 52V 17Ah Hailong top-tube pack. Both include a 4A charger and an integrated battery management system (BMS) for safer, balanced charging and riding.\u003c\/p\u003e\n\n\u003ch3\u003eBenefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExtend your ride — higher capacity means fewer stops to recharge and longer range per charge.\u003c\/li\u003e\n\u003cli\u003eLess worry about battery health — built-in BMS protects against short circuit, over-charge, over-discharge and over-current.\u003c\/li\u003e\n\u003cli\u003eChoose the right balance of weight and range — pick the 21Ah down-tube for maximum distance or the 17Ah top-tube for a lighter bike.\u003c\/li\u003e\n\u003cli\u003eSimpler charging — standard 4A charger for routine, predictable recharging times.\u003c\/li\u003e\n\u003cli\u003eMore dependable rides on hills and longer trips thanks to consistent power delivery and cell balancing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatibility: Designed to work with the Eunorau Flash e-bike.\u003c\/li\u003e\n\u003cli\u003eTwo form factors: down-tube battery (21Ah) and top-tube Hailong battery (17Ah).\u003c\/li\u003e\n\u003cli\u003eIntegrated BMS with cell balancing for safety and longevity.\u003c\/li\u003e\n\u003cli\u003eIncludes a 4A charger for standard charging.\u003c\/li\u003e\n\u003cli\u003eDurable black finish that matches the bike’s aesthetics.\u003c\/li\u003e\n\u003cli\u003eCycle life rated at approximately 500–800 cycles under normal usage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatibility:\n\u003cul\u003e\n\u003cli\u003eEunorau Flash — https:\/\/eunorau-ebike.com\/products\/flash\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e52V 21Ah HYFX-D (LG3500) — Down-tube battery\n\u003cul\u003e\n\u003cli\u003eModel: 52V21Ah lithium ion e-bike battery (HYFX-D LG3500)\u003c\/li\u003e\n\u003cli\u003eNominal Voltage: 52V\u003c\/li\u003e\n\u003cli\u003eRated Capacity: 21Ah\u003c\/li\u003e\n\u003cli\u003eWeight: 13.9 lbs (?6.3 kg)\u003c\/li\u003e\n\u003cli\u003eStandard Charge Current: 4A\u003c\/li\u003e\n\u003cli\u003eType: Down-tube battery\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eCycle Life: 500–800 cycles\u003c\/li\u003e\n\u003cli\u003eCharger: 4A charger included\u003c\/li\u003e\n\u003cli\u003eBMS \u0026amp; Balance: Short-circuit protection, over-charge protection, over-discharge protection, over-current protection, cell balancing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e52V 17Ah Hailong — Top-tube battery\n\u003cul\u003e\n\u003cli\u003eModel: 52V17Ah lithium ion e-bike battery (Hailong)\u003c\/li\u003e\n\u003cli\u003eNominal Voltage: 52V\u003c\/li\u003e\n\u003cli\u003eRated Capacity: 17Ah\u003c\/li\u003e\n\u003cli\u003eWeight: 10.5 lbs (?4.8 kg)\u003c\/li\u003e\n\u003cli\u003eStandard Charge Current: 4A\u003c\/li\u003e\n\u003cli\u003eType: Top-tube (Hailong) battery\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eCycle Life: 500–800 cycles\u003c\/li\u003e\n\u003cli\u003eCharger: 4A charger included\u003c\/li\u003e\n\u003cli\u003eBMS \u0026amp; Balance: Short-circuit protection, over-charge protection, over-discharge protection, over-current protection, cell balancing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003e--- This Variant ---\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Capacity:\u003c\/strong\u003e Third 17AH Battery\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EUNORAU","offers":[{"title":"Default Title","offer_id":52308331725087,"sku":"52V-17AH-B05-RA4","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0887\/1965\/5199\/files\/V1A0353.jpg?v=1760661826","url":"https:\/\/offgridselection.com\/products\/eunorau-flash-extra-battery-52v21ah-2nd-52v17ah-3rd-both-52v-21ah-hyfx-d-ra4-third-17ah-battery","provider":"Off Grid Selection","version":"1.0","type":"link"}