{"product_id":"speras-m4-v3-21700-battery-extension-tube","title":"SPERAS M4 V3 TB217 21700 Battery Extension Tube","description":"\u003cp\u003e\u003cspan\u003eUpgrade your \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSPERAS M4 V3 flashlight\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eTB217 21700 Battery Extension Tube\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, a precision-machined accessory designed to accommodate a larger 21700 Li-ion battery in place of the original 18350 battery.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWith a compatible high-capacity 21700 battery, the M4 V3 can deliver up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2,800 lumens, a maximum beam distance of 740 meters, and up to 500 hours of runtime in ECO mode\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The extended battery tube also provides a longer, more comfortable grip for outdoor use.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eUpgrade to 21700 Battery Power\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cspan\u003eThe TB217 replaces the original short battery tube of the SPERAS M4 V3, allowing the flashlight to operate with a single 21700 Li-ion battery.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eCompared with the standard 18350 configuration, a high-capacity 21700 battery provides significantly more energy for extended outdoor activities, camping, searching, and emergency preparedness.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eUnlock Up to 2,800 Lumens and 740m Throw\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cspan\u003eWhen equipped with the TB217 extension tube and a suitable high-discharge 21700 battery, the SPERAS M4 V3 can achieve improved maximum performance.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Output:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Up to 2,800 lumens\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMaximum Beam Distance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Up to 740 meters\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMaximum ECO Runtime:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Up to 500 hours with a 5000mAh 21700 battery\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan\u003eThese performance figures apply to the compatible M4 V3 flashlight with the specified battery configuration, not to the extension tube alone.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eExtended Runtime for Outdoor Adventures\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cspan\u003eThe larger battery capacity makes the TB217 particularly useful for users who need longer operating times between charges.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eWith a compatible 5000mAh 21700 battery, the M4 V3 can achieve up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e500 hours of runtime in ECO mode\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making the extended configuration suitable for longer camping trips, outdoor exploration, and emergency lighting.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003ePrecision-Machined Aluminum Construction\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cspan\u003eThe TB217 is constructed from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6061 aluminum alloy\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMilitary Type III hard-anodized finish\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, matching the durable construction of the SPERAS M4 V3.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eIts textured exterior provides a secure grip, while the extended body length offers improved handling, particularly during extended use or when wearing gloves.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eEasy Installation\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cspan\u003eThe TB217 is designed as a direct replacement for the original M4 V3 battery tube.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eSimply remove the original short tube, install the TB217 extension tube, and use a compatible 21700 Li-ion battery.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eNo complicated modifications are required.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eDesigned specifically for the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSPERAS M4 V3 flashlight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eConverts the original 18350 battery configuration to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21700\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eSupports up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2,800 lumens\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with a compatible battery\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eExtends maximum beam distance to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e740 meters\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eUp to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e500 hours of ECO runtime\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with a 5000mAh 21700 battery\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003ePrecision CNC-machined \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6061 aluminum alloy\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eMilitary Type III hard-anodized finish\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eTextured surface for a secure grip\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eLonger body for improved handling\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\t\u003cli\u003e\n\t\u003cp\u003e\u003cspan\u003eDirect replacement for the original battery tube\u003c\/span\u003e\u003c\/p\u003e\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003ctable\u003e\n\t\u003ctbody\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003cth\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\t\t\t\u003cth\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/th\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eSPERAS\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eTB217\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eBattery Extension Tube\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eSPERAS M4 V3\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eBattery Compatibility\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003e1 × 21700 Li-ion\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eMaterial\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003e6061 Aluminum Alloy\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eFinish\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eMilitary Type III Hard Anodizing\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eInstallation\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eReplacement Battery Tube\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eMaximum Flashlight Output*\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003e2,800 Lumens\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eMaximum Beam Distance*\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003e740 Meters\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003eMaximum ECO Runtime*\u003c\/span\u003e\u003c\/td\u003e\n\t\t\t\u003ctd\u003e\u003cspan\u003e500 Hours\u003c\/span\u003e\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cspan\u003ePerformance figures refer to the SPERAS M4 V3 flashlight equipped with the TB217 extension tube and a suitable 21700 battery. Actual performance depends on battery specifications and operating conditions.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003e\u003cspan\u003eCompatibility Notice\u003c\/span\u003e\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThis product is an extension tube only, not a complete flashlight.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eDesigned specifically for the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSPERAS M4 V3\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Compatibility with earlier M4 versions or other SPERAS models is not confirmed.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan\u003eA compatible 21700 Li-ion battery is required to use the extended configuration. The flashlight and battery are not included unless explicitly specified in the selected package.\u003c\/span\u003e\u003c\/p\u003e\n","brand":"SPERAS","offers":[{"title":"Default Title","offer_id":67670096576661,"sku":"TB217","price":22.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0629\/7039\/6821\/files\/9ff1470090c808da72722f7874876bed.jpg?v=1791439356","url":"https:\/\/flashlightgo.com\/products\/speras-m4-v3-21700-battery-extension-tube","provider":"flashlightgo","version":"1.0","type":"link"}