{"product_id":"ultraspire-21700-rechargeable-battery","title":"UltrAspire 21700 Rechargeable Battery","description":"\u003cp\u003eThe \u003cb\u003eUltrAspire 21700 Rechargeable Battery\u003c\/b\u003e is the spare battery for the Lumen 800 Solstice, UltrAspire's all-night waist light. Pack a second one and a long night on the trail gets a whole lot less stressful.\u003c\/p\u003e\u003cp\u003eIt is for ultrarunners and overnight racers who run the Solstice through long races and big training nights. UltrAspire pairs it with the Solstice to make sure you have the power to run through the night, and you can charge it right inside the light. With a spare charged and ready in your drop bag, a fading light is a quick fix rather than a race-ender.\u003c\/p\u003e\u003cp\u003eIt fits the \u003ca href=\"\/products\/ultraspire-lumen-800-solstice-waist-light\"\u003eLumen 800 Solstice\u003c\/a\u003e only. Running a \u003ca href=\"\/products\/ultraspire-lumen-600-5-0-waist-light\"\u003eLumen 600 5.0\u003c\/a\u003e or \u003ca href=\"\/products\/ultraspire-lumen-850-duo-waist-light\"\u003eLumen 850 Duo\u003c\/a\u003e? You need the \u003ca href=\"\/products\/ultraspire-18650-rechargeable-battery\"\u003eUltrAspire 18650 battery\u003c\/a\u003e.\u003c\/p\u003e","brand":"UltrAspire","offers":[{"title":"Default Title","offer_id":52499252314423,"sku":"UA-UA545RE","price":29.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0699\/6908\/4727\/files\/download-2026-06-24T215859.176.png?v=1782320358","url":"https:\/\/foveo.run\/products\/ultraspire-21700-rechargeable-battery","provider":"Foveo Running","version":"1.0","type":"link"}