{"product_id":"fenix-arb-l18-4000-18650-4000mah-rechargeable-battery","title":"Fenix ARB-L18-4000 18650 4000mAh Rechargeable Li-ion Battery","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBattery Compatibility: \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e• 18650 battery sizes vary by brand and model. Even a few millimeters can make a battery incompatible with your flashlight. • Please verify the correct length and type (Flat Top or Button Top) before purchasing. Thank you for your understanding.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eFenix ARB-L18-4000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a high-capacity rechargeable 18650 lithium-ion battery designed for compatible Fenix flashlights and other devices using protected 18650 batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWith a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4000mAh capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003estable 7A maximum output current\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, it provides extended runtime while maintaining reliable performance in high-output lighting applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe battery features built-in protection circuitry to help protect against short circuits, overcharging, over-discharging and overheating. Integrated pressure vents provide an additional layer of safety.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUnlike the longer ARB-L18-4000U version, this battery \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edoes not include a built-in USB-C charging port\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making its shorter 69.2 mm length important for compatibility with devices that cannot accommodate extended-length 18650 batteries.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFEATURES\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eGenuine Fenix rechargeable battery\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e18650 Li-ion battery\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e4000mAh high capacity\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e3.6V nominal voltage\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMaximum output current: 7A\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIntegrated protection circuitry\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps protect against short circuits\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOvercharge and over-discharge protection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOverheating protection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePressure relief vents for added safety\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUp to 500 charge cycles\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned to retain approximately 75% capacity after 500 cycles\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eSPECIFICATIONS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fenix\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eModel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ARB-L18-4000\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eBattery Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Rechargeable Li-ion\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eBattery Size:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 18650\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eCapacity:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4000mAh\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eEnergy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 14.4Wh\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eVoltage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3.6V\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eRecommended Charging Current:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2A\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Charging Current:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4A\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Output Current:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 7A\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eLength:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 69.2 mm \/ 2.72 in\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eDiameter:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 18.75 mm \/ 0.74 in\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eWeight:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 55 g \/ 1.94 oz\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Charge Cycles:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Up to 500\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eBuilt-in USB Charging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e No\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eProtection Circuit:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Yes\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eDIMENSIONS \u0026amp; COMPATIBILITY\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eBattery Dimensions:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003e69.2 mm long × 18.75 mm diameter\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe ARB-L18-4000 is a protected 18650 battery and is slightly longer than an unprotected standard 18650 cell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways verify the available battery compartment dimensions before purchasing, especially when using the battery in non-Fenix products.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Do not confuse this model with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eFenix ARB-L18-4000U USB-C battery\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, which is approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e72 mm long\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and may not fit devices designed for the shorter ARB-L18-4000.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"ProductDescriptionContainer prodAccordionContent\" itemprop=\"description\"\u003e\n\u003cdiv class=\"toggled-container\" style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"toggled-container\" style=\"text-align: left;\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003eWe are unable to accept returned batteries once they have been opened, so please ensure they are the correct cell for your device before ordering.\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Fenix","offers":[{"title":"Default Title","offer_id":50353338712304,"sku":"FENIX-ARB-L18-4000","price":35.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0315\/1901\/4957\/files\/Captured_ecran_le2026-09-01a11.15.09.png?v=1788275748","url":"https:\/\/www.flashlightworld.com\/products\/fenix-arb-l18-4000-18650-4000mah-rechargeable-battery","provider":"FlashLight World","version":"1.0","type":"link"}