{"id":759,"date":"2026-07-01T21:01:33","date_gmt":"2026-07-01T21:01:33","guid":{"rendered":"https:\/\/e-liquidhub.eu\/?post_type=product&#038;p=759"},"modified":"2026-07-01T21:02:08","modified_gmt":"2026-07-01T21:02:08","slug":"fogstar-energy-fs4000","status":"publish","type":"product","link":"https:\/\/e-liquidhub.eu\/fi\/tuote\/fogstar-energy-fs4000\/","title":{"rendered":"Fogstar Energy FS4000"},"content":{"rendered":"<p data-path-to-node=\"11\">Tired of choosing between a massive storage capacity and a high amp discharge when shopping for your high-power mod? <b data-path-to-node=\"11\" data-index-in-node=\"117\">The Fogstar Energy FS4000 21700 Battery<\/b> solves this exact problem instantly. Engineered by one of the UK\u2019s most trusted battery testing powerhouses, this premium 21700 power cell is tailor-made for high-performance and demanding vaping devices. <b data-path-to-node=\"11\" data-index-in-node=\"362\">Consequently<\/b>, you can push your favorite sub-ohm setups to their absolute limits without worrying about sudden voltage drops or mid-day power failure.<\/p>\n<h3 data-path-to-node=\"12\">\ud83d\udd0b Elite 4000mAh Capacity Paired with a 25A Continuous Output<\/h3>\n<p data-path-to-node=\"13\">This heavy-duty cell is designed specifically to keep your advanced setups running at peak power. It treats your kit to a whopping <b data-path-to-node=\"13\" data-index-in-node=\"131\">4000mAh nominal capacity<\/b>, unlocking staggering longevity that easily outmuscles standard 18650 cells. <b data-path-to-node=\"13\" data-index-in-node=\"233\">Furthermore<\/b>, because it boasts a robust <b data-path-to-node=\"13\" data-index-in-node=\"273\">25A continuous discharge rate<\/b>, <b data-path-to-node=\"13\" data-index-in-node=\"304\">therefore<\/b>, it safely delivers rapid ramp-up times and thick vapor production across power-hungry dual-battery or single-battery mod configurations.<\/p>\n<ul data-path-to-node=\"14\">\n<li>\n<p data-path-to-node=\"14,0,0\"><b data-path-to-node=\"14,0,0\" data-index-in-node=\"0\">High-Drain Dominance:<\/b> Perfect for sub-ohm, low-resistance builds and variable wattage kits running at high tiers.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"14,1,0\"><b data-path-to-node=\"14,1,0\" data-index-in-node=\"0\">Flat-Top Architecture:<\/b> Built as a non-protected, flat-top cell engineered to fit flush inside modern regulated vape kits that utilize built-in chipset safeguards.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"14,2,0\"><b data-path-to-node=\"14,2,0\" data-index-in-node=\"0\">Stringent Batch Testing:<\/b> Part of the premier Fogstar Energy lineup, meaning every batch undergoes meticulous quality control to ensure strict rating safety.<\/p>\n<\/li>\n<\/ul>\n<p data-path-to-node=\"15\"><b data-path-to-node=\"15\" data-index-in-node=\"0\">Because<\/b> it utilizes an advanced Lithium-Ion chemical matrix, you can expect an outstanding typical cycle life of 200 to 500 recharges before noticing any major capacity drop-off. <b data-path-to-node=\"15\" data-index-in-node=\"179\">Simply put<\/b>, it provides a straightforward, highly reliable, and completely hassle-free power solution for modern vapers who refuse to compromise on power or longevity.<\/p>\n<blockquote data-path-to-node=\"17\">\n<p data-path-to-node=\"17,0\">\u26a0\ufe0f <b data-path-to-node=\"17,0\" data-index-in-node=\"3\">Critical 21700 Battery Safety Warnings:<\/b> Lithium-ion cells hold massive amounts of energy and require cautious handling. <b data-path-to-node=\"17,0\" data-index-in-node=\"123\">In addition<\/b>, always strictly adhere to the following safety protocols:<\/p>\n<\/blockquote>\n<ul data-path-to-node=\"18\">\n<li>\n<p data-path-to-node=\"18,0,0\"><b data-path-to-node=\"18,0,0\" data-index-in-node=\"0\">Dedicated Smart Charging:<\/b> Never leave a charging cell unattended. Always recharge your 21700 batteries via a high-quality external smart charger (such as an Xtar bay hub) rather than relying on the vape&#8217;s passthrough USB connection.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"18,1,0\"><b data-path-to-node=\"18,1,0\" data-index-in-node=\"0\">Wrap Inspection:<\/b> Regularly inspect the outer protective wrap and top white insulator circle for small tears, scratches, or nicks. If you spot any damage, repair the wrap immediately or recycle the cell safely.<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"18,2,0\"><b data-path-to-node=\"18,2,0\" data-index-in-node=\"0\">Loose Storage Ban:<\/b> Keep loose batteries away from keys, coins, or other metallic items in your pockets or bags. Always store your spare cells securely inside a dedicated plastic protective battery case.<\/p>\n<\/li>\n<\/ul>\n<h3 data-path-to-node=\"20\">\ud83d\udce6 Accessory Specifications<\/h3>\n<ul data-path-to-node=\"21\">\n<li>\n<p data-path-to-node=\"21,0,0\"><b data-path-to-node=\"21,0,0\" data-index-in-node=\"0\">Brand:<\/b> Fogstar Energy (FS4000 Series)<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,1,0\"><b data-path-to-node=\"21,1,0\" data-index-in-node=\"0\">Battery Size Size:<\/b> 21700 High-Capacity Configuration<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,2,0\"><b data-path-to-node=\"21,2,0\" data-index-in-node=\"0\">Nominal Storage Capacity:<\/b> 4000mAh<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,3,0\"><b data-path-to-node=\"21,3,0\" data-index-in-node=\"0\">Nominal Working Voltage:<\/b> 3.6V<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,4,0\"><b data-path-to-node=\"21,4,0\" data-index-in-node=\"0\">Continuous Discharge Rate:<\/b> 25A Max Amperage<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,5,0\"><b data-path-to-node=\"21,5,0\" data-index-in-node=\"0\">Terminal Profile Layout:<\/b> Flat Top (Non-Protected)<\/p>\n<\/li>\n<li>\n<p data-path-to-node=\"21,6,0\"><b data-path-to-node=\"21,6,0\" data-index-in-node=\"0\">Ideal Application:<\/b> Sub-Ohm Coils and High-Drain Regulated Vape Devices<\/p>\n<\/li>\n<\/ul>\n<h2 data-path-to-node=\"23\">\ud83d\udcca Hardware Dimension Check<\/h2>\n<h3 data-path-to-node=\"24\">\ud83e\uddea Removable Battery Sizing Guide<\/h3>\n<table data-path-to-node=\"25\">\n<thead>\n<tr>\n<td><strong>Battery Format Profile<\/strong><\/td>\n<td><strong>Physical Measurement Size<\/strong><\/td>\n<td><strong>Compatibility Breakdown<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><span data-path-to-node=\"25,1,0,0\"><b data-path-to-node=\"25,1,0,0\" data-index-in-node=\"0\">Traditional 18650<\/b><\/span><\/td>\n<td><span data-path-to-node=\"25,1,1,0\">18.6mm x 65.1mm<\/span><\/td>\n<td><span data-path-to-node=\"25,1,2,0\">Smaller standard profile. Will <i data-path-to-node=\"25,1,2,0\" data-index-in-node=\"31\">not<\/i> fit 21700 devices unless an adapter sleeve is used.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span data-path-to-node=\"25,2,0,0\"><b data-path-to-node=\"25,2,0,0\" data-index-in-node=\"0\">Oversized 21700<\/b><\/span><\/td>\n<td><span data-path-to-node=\"25,2,1,0\"><b data-path-to-node=\"25,2,1,0\" data-index-in-node=\"0\">21.0mm x 70.0mm<\/b><\/span><\/td>\n<td><span data-path-to-node=\"25,2,2,0\"><b data-path-to-node=\"25,2,2,0\" data-index-in-node=\"0\">\u2705 Check Kit Specs:<\/b> Fits modern, high-powered mod housings built specifically for 21700 cells.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 data-path-to-node=\"26\">\ud83d\uded2 The E-Liquid Hub Multi-Buy Advantage<\/h3>\n<ul data-path-to-node=\"27\">\n<li>\n<p data-path-to-node=\"27,0,0\"><b data-path-to-node=\"27,0,0\" data-index-in-node=\"0\">Stock Up and Save:<\/b> Mix and match your favorite hardware accessories, smart chargers, and juices across our store.<\/p>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Tired of choosing between a massive storage capacity and a high amp discharge when shopping for your high-power mod? The Fogstar Energy FS4000 21700 Battery solves this exact problem instantly. Engineered by one of the UK\u2019s most trusted battery testing powerhouses, this premium 21700 power cell is tailor-made for high-performance and demanding vaping devices. Consequently, [&#8230;]\n","protected":false},"featured_media":760,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[89],"product_tag":[112],"class_list":["post-759","product","type-product","status-publish","has-post-thumbnail","product_cat-accessories","product_tag-batteries","first","instock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub<\/title>\n<meta name=\"description\" content=\"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/e-liquidhub.eu\/fi\/tuote\/fogstar-energy-fs4000\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub\" \/>\n<meta property=\"og:description\" content=\"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/e-liquidhub.eu\/fi\/tuote\/fogstar-energy-fs4000\/\" \/>\n<meta property=\"og:site_name\" content=\"e-liquidhub.eu\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-01T21:02:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/e-liquidhub.eu\/wp-content\/uploads\/2026\/07\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png\" \/>\n\t<meta property=\"og:image:width\" content=\"500\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Arvioitu lukuaika\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minuuttia\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/\",\"url\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/\",\"name\":\"Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/e-liquidhub.eu\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png\",\"datePublished\":\"2026-07-01T21:01:33+00:00\",\"dateModified\":\"2026-07-01T21:02:08+00:00\",\"description\":\"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/#breadcrumb\"},\"inLanguage\":\"fi\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fi\",\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/#primaryimage\",\"url\":\"https:\\\/\\\/e-liquidhub.eu\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png\",\"contentUrl\":\"https:\\\/\\\/e-liquidhub.eu\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png\",\"width\":500,\"height\":500,\"caption\":\"Fogstar Energy FS4000\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/product\\\/fogstar-energy-fs4000\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/e-liquidhub.eu\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/e-liquidhub.eu\\\/fi\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Fogstar Energy FS4000\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/e-liquidhub.eu\\\/#website\",\"url\":\"https:\\\/\\\/e-liquidhub.eu\\\/\",\"name\":\"e-liquidhub.eu\",\"description\":\"Online E-liquid and Accessories Hub.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/e-liquidhub.eu\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fi\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub","description":"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/e-liquidhub.eu\/fi\/tuote\/fogstar-energy-fs4000\/","og_locale":"fi_FI","og_type":"article","og_title":"Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub","og_description":"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!","og_url":"https:\/\/e-liquidhub.eu\/fi\/tuote\/fogstar-energy-fs4000\/","og_site_name":"e-liquidhub.eu","article_modified_time":"2026-07-01T21:02:08+00:00","og_image":[{"width":500,"height":500,"url":"https:\/\/e-liquidhub.eu\/wp-content\/uploads\/2026\/07\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Arvioitu lukuaika":"3 minuuttia"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/","url":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/","name":"Fogstar Energy FS4000 21700 4000mAh | E-Liquid Hub","isPartOf":{"@id":"https:\/\/e-liquidhub.eu\/#website"},"primaryImageOfPage":{"@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/#primaryimage"},"image":{"@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/#primaryimage"},"thumbnailUrl":"https:\/\/e-liquidhub.eu\/wp-content\/uploads\/2026\/07\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png","datePublished":"2026-07-01T21:01:33+00:00","dateModified":"2026-07-01T21:02:08+00:00","description":"Buy the Fogstar Energy FS4000 21700 Vape Battery. Features an impressive 4000mAh capacity and a 25A continuous discharge. Save up to 46% with bulk deals!","breadcrumb":{"@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/#breadcrumb"},"inLanguage":"fi","potentialAction":[{"@type":"ReadAction","target":["https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/"]}]},{"@type":"ImageObject","inLanguage":"fi","@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/#primaryimage","url":"https:\/\/e-liquidhub.eu\/wp-content\/uploads\/2026\/07\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png","contentUrl":"https:\/\/e-liquidhub.eu\/wp-content\/uploads\/2026\/07\/fogstar-energy-21700-fs4000-4000mah-battery.jpg.png","width":500,"height":500,"caption":"Fogstar Energy FS4000"},{"@type":"BreadcrumbList","@id":"https:\/\/e-liquidhub.eu\/product\/fogstar-energy-fs4000\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/e-liquidhub.eu\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/e-liquidhub.eu\/fi\/shop\/"},{"@type":"ListItem","position":3,"name":"Fogstar Energy FS4000"}]},{"@type":"WebSite","@id":"https:\/\/e-liquidhub.eu\/#website","url":"https:\/\/e-liquidhub.eu\/","name":"e-liquidhub.eu","description":"Online E-liquid and Accessories Hub.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/e-liquidhub.eu\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fi"}]}},"jetpack_sharing_enabled":true,"tiered_pricing_type":"fixed","tiered_pricing_fixed_rules":[],"tiered_pricing_product_settings":{"layout":"default","base_unit_name":{"singular":null,"plural":null},"default_variation":null},"tiered_pricing_minimum_quantity":null,"tiered_pricing_roles_data":[],"tiered_pricing_percentage_rules":[],"_links":{"self":[{"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/product\/759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/comments?post=759"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/media\/760"}],"wp:attachment":[{"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/media?parent=759"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/product_brand?post=759"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/product_cat?post=759"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/e-liquidhub.eu\/fi\/wp-json\/wp\/v2\/product_tag?post=759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}