{"id":10815,"date":"2025-04-25T21:12:32","date_gmt":"2025-04-25T21:12:32","guid":{"rendered":"https:\/\/carexamer.com\/blog\/?p=10815"},"modified":"2025-10-26T22:20:54","modified_gmt":"2025-10-26T22:20:54","slug":"how-to-change-tesla-12v-battery","status":"publish","type":"post","link":"https:\/\/carexamer.com\/blog\/how-to-change-tesla-12v-battery\/","title":{"rendered":"How to Change Tesla 12V Battery"},"content":{"rendered":"\n<p>Got a warning that your Tesla\u2019s 12V battery needs service? Don\u2019t stress \u2014 it\u2019s easier to fix than you think! First, power off your car properly through the screen. Pop the frunk open, remove a few plastic covers, and you\u2019ll find the 12V battery tucked inside (front left for Model 3\/Y).  Here is a simple guide how to Change Tesla 12V Battery and it works similarly for <strong>Model S<\/strong>, <strong>Model 3<\/strong>, <strong>Model X<\/strong>, <strong>Model Y<\/strong>, with slight differences.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udccb <strong>General Tools You Need:<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Socket wrench (usually 10mm socket)<\/li>\n\n\n\n<li>Flathead screwdriver or plastic trim tools<\/li>\n\n\n\n<li>New 12V battery (OEM Tesla spec \u2014 AGM or lithium depending on model\/year)<\/li>\n\n\n\n<li>Safety gloves (recommended)<\/li>\n\n\n\n<li>Protective glasses (recommended)<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-font-size has-small-font-size\"><a class=\"wp-block-button__link has-vivid-cyan-blue-background-color has-background wp-element-button\" href=\"https:\/\/carexamer.com\/\">Book inspection<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udded <strong>Step-by-Step Instructions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>Power Off the Car Properly<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sit inside \u2192 Controls \u2192 Safety \u2192 <strong>Power Off<\/strong>.<\/li>\n\n\n\n<li>Wait a few minutes \u2014 car fully shuts down systems.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Open the Frunk (Front Trunk)<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use your Tesla screen or mobile app to pop the frunk.<\/li>\n\n\n\n<li>If the 12V battery is already dead \u2192 you&#8217;ll need to use <strong>manual frunk release<\/strong> (behind tow eye cover at front bumper).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Remove the Top Covers<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove the <strong>plastic covers<\/strong> over the frunk area (easy clips or bolts depending on model).<\/li>\n\n\n\n<li>Find the <strong>HV (High Voltage) disconnect loop<\/strong> (usually orange-colored).<\/li>\n<\/ul>\n\n\n\n<p><strong>Important:<\/strong><br><strong>Disconnect the HV loop<\/strong> for safety if available (Model S\/X mainly) before working on 12V systems.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Locate the 12V Battery<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>It\u2019s typically:\n<ul class=\"wp-block-list\">\n<li>Model 3\/Y: front-left under the trim covers.<\/li>\n\n\n\n<li>Model S\/X: under more trim near the frunk.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>Disconnect the 12V Battery<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove the <strong>negative (-)<\/strong> terminal first.<\/li>\n\n\n\n<li>Then remove the <strong>positive (+)<\/strong> terminal.<\/li>\n\n\n\n<li>Unbolt the battery hold-down bracket (usually 10mm bolts).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>Remove the Old Battery<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Carefully lift it out. They are small but <strong>still heavy<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>Install the New Battery<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Place new battery in position.<\/li>\n\n\n\n<li>Attach <strong>positive (+)<\/strong> terminal first.<\/li>\n\n\n\n<li>Then attach <strong>negative (-)<\/strong> terminal.<\/li>\n\n\n\n<li>Reinstall hold-down bracket.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8. <strong>Reconnect Everything<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reconnect the HV loop (if you disconnected it earlier).<\/li>\n\n\n\n<li>Replace frunk trim and covers.<\/li>\n\n\n\n<li>Close the frunk.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">9. <strong>Power the Car Back On<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Car should auto-restart when you open the door or press the brake pedal.<\/li>\n<\/ul>\n\n\n\n<p>\u2705 <strong>Check on the screen<\/strong> for any error messages.<br>\u2705 <strong>Clear any 12V battery warnings<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Specific Notes by Model:<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Model<\/th><th>Special Note<\/th><\/tr><\/thead><tbody><tr><td>Model S (older)<\/td><td>Traditional AGM battery, often in awkward location under panels.<\/td><\/tr><tr><td>Model 3\/Y (newer)<\/td><td>Now many use <strong>Li-ion 12V<\/strong> batteries \u2192 lighter and longer lasting.<\/td><\/tr><tr><td>Model X<\/td><td>More panels to remove but same principles.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\ud83d\udea8 <strong>Safety Reminders<\/strong><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>NEVER short the battery terminals.<\/li>\n\n\n\n<li>Always disconnect <strong>negative (-)<\/strong> first, reconnect <strong>positive (+)<\/strong> first.<\/li>\n\n\n\n<li>If unsure, Tesla Service or Mobile Service can swap it for you \u2014 costs more, but 100% covered for warranty.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\ud83d\udee0\ufe0f Pro Tip:<\/h1>\n\n\n\n<p>Tesla now uses <strong>lithium-ion 12V batteries<\/strong> (not just lead-acid) in newer models \u2014 <strong>check your owner&#8217;s manual<\/strong> or check your existing battery before buying a replacement.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/carexamer.com\/blog\/sed-volkswagen-vw-vehicle-inspection\/\">Buying a used VW.<\/a>\u00a0<a href=\"https:\/\/carexamer.com\/blog\/a-guide-to-inspecting-a-used-vauxhall-vehicle\/\">Buying used vauxhall<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-bmw-inspection\/\">BMW<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-jaguar-inspection\/\">Jaguar<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-ford-vehicle-inspection\/\">Ford<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-volvo-car-inspection\/\">Volvo<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-range-rover-suv-inspection\/\">Range rover<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-bentley-vehicle-inspection\/\">Bentley<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-aston-martin-vehicle-inspection\/\">Aston Martin<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/the-used-porsche-vehicle-inspection\/\">Porsche<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-ferrari-vehicle-inspection\/\">Ferrari<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-lamborghini-vehicle-inspection\/\">Lamborghini<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-maserati-vehicle-inspection\/\">Maserati<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-hyundai-vehicle-inspections\/\">Hyunda<\/a>i,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-tesla-vehicle-inspection\/\">Tesla<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-a-used-honda-pre-purchase-inspection\/\">Honda<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-used-pagani-pre-purchase-inspection\/\">Pagani<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Got a warning that your Tesla\u2019s 12V battery needs service? Don\u2019t stress \u2014 it\u2019s easier to fix than you think!<\/p>\n","protected":false},"author":2,"featured_media":10816,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,1332],"tags":[],"class_list":["post-10815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car-problems-and-repair-costs","category-tesla-problems-and-repair-costs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v23.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Change Tesla 12V Battery<\/title>\n<meta name=\"description\" content=\"Learn how to Change Tesla 12V Battery on your Tesla Model 3, Y, S, or X with a simple step-by-step guide. 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