{"product_id":"ultraspire-18650-rechargeable-battery","title":"UltrAspire 18650 Rechargeable Battery","description":"\u003cp\u003eThe \u003cb\u003eUltrAspire 18650 Rechargeable Battery\u003c\/b\u003e is the spare rechargeable battery for UltrAspire's Lumen waist lights, programmed for a low-amperage output that gives the light the steady power it wants. Toss one in your pack and a long night on the trail stops being a runtime math problem.\u003c\/p\u003e\u003cp\u003eIt suits ultrarunners and night racers using a Lumen waist light, especially when the race clock runs past dark. You can charge it inside the light or on a separate charger, and UltrAspire rates it for a wide range of temperatures. A spare means a fresh battery is ready when the first one fades, without carrying a second lamp.\u003c\/p\u003e\u003cp\u003eIt powers the \u003ca href=\"\/products\/ultraspire-lumen-600-5-0-waist-light\"\u003eLumen 600 5.0\u003c\/a\u003e and \u003ca href=\"\/products\/ultraspire-lumen-850-duo-waist-light\"\u003eLumen 850 Duo\u003c\/a\u003e. Running the \u003ca href=\"\/products\/ultraspire-lumen-800-solstice-waist-light\"\u003eLumen 800 Solstice\u003c\/a\u003e? It takes the larger \u003ca href=\"\/products\/ultraspire-21700-rechargeable-battery\"\u003eUltrAspire 21700 battery\u003c\/a\u003e instead.\u003c\/p\u003e","brand":"UltrAspire","offers":[{"title":"Default Title","offer_id":52498050515255,"sku":"UA-UA530BK","price":21.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0699\/6908\/4727\/files\/download-2026-06-24T215700.892.png?v=1782320238","url":"https:\/\/foveo.run\/products\/ultraspire-18650-rechargeable-battery","provider":"Foveo Running","version":"1.0","type":"link"}