{"product_id":"battery-tender-4-amp-battery-charger-maintainer-switchable-6v-12v-smart-automatic-float-protection-for-cars-agm-lithium","title":"Battery Tender 4 Amp Battery Charger \u0026 Maintainer — Switchable 6V\/12V Smart Automatic, Float Protection for Cars, AGM \u0026 Lithium","description":"\u003cstrong\u003eBattery Tender's 4 Amp Power Tender is a fully automatic, switchable 6V\/12V charger and maintainer that safely charges and then holds automotive batteries at the correct storage voltage.\u003c\/strong\u003e\n\n\u003cp\u003eIf you need a compact, dependable charger for cars, SUVs, trucks, motorcycles or seasonal vehicles, this 4 amp unit provides enough power to refill and maintain most automotive batteries without overcharging. Its adaptive charging electronics monitor battery condition hundreds of times per second and automatically shifts from charging to float mode so batteries stay healthy in storage. The unit includes a combo cable with alligator clips and ring terminals, and arrives backed by a 5-year warranty and lifetime customer support.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this charger protect my battery from overcharging?\u003c\/h3\u003e\n\u003cp\u003eThe Battery Tender 4 Amp uses an automatic float\/maintenance stage that takes over when the battery reaches full charge, preventing the continuous trickle that can damage cells. An onboard solid-state status LED shows charging or float condition, and the intelligent ISM controller resumes full charging only if the battery voltage drops under load.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic float\/maintain stage prevents overcharge\u003c\/li\u003e\n  \u003cli\u003eISM adaptive monitoring adjusts output hundreds of times per second\u003c\/li\u003e\n  \u003cli\u003eTwo-color LED indicates charging vs. maintenance\u003c\/li\u003e\n  \u003cli\u003eWill resume charging if battery voltage falls below set threshold\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it work with different battery chemistries and voltages?\u003c\/h3\u003e\n\u003cp\u003eYes — the unit is switchable between 6V and 12V modes and is compatible with lead-acid types (flooded, AGM, gel) as well as LiFePO4 lithium batteries. You select the correct voltage with the push of a button, and the charger’s algorithms apply appropriate charging behavior for supported chemistries.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSwitchable 6V or 12V operation\u003c\/li\u003e\n  \u003cli\u003eSupports flooded, AGM, gel and LiFePO4 lithium batteries\u003c\/li\u003e\n  \u003cli\u003eAutomatic polarity detection prevents incorrect connections\u003c\/li\u003e\n  \u003cli\u003eUL\/CSA, CE and BC approvals for safety and reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to install and use every day?\u003c\/h3\u003e\n\u003cp\u003eThe 4 Amp Power Tender is intended for plug-and-forget convenience: connect the clamps or ring terminals, choose 6V or 12V, and the charger manages the rest. With a combined 11 feet of cord (6 ft AC, 5 ft DC), it reaches batteries in engine bays or garage storage spaces without needing extension cords.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCombo cable with alligator clips and ring terminals included\u003c\/li\u003e\n  \u003cli\u003eCompact, lightweight housing ideal for shop or home storage\u003c\/li\u003e\n  \u003cli\u003eSpark-proof clips and reverse polarity protection for safe hookup\u003c\/li\u003e\n  \u003cli\u003eVisible LED status for easy monitoring at a glance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat accessories and support come with the charger?\u003c\/h3\u003e\n\u003cp\u003eThe package contains the 4 Amp charger and a combo cable that allows both temporary clip-on or permanent ring terminal connections. Battery Tender backs the unit with a five-year warranty and offers lifetime customer service to answer installation or troubleshooting questions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded ring terminal and alligator clip combo cable\u003c\/li\u003e\n  \u003cli\u003eFive-year manufacturer warranty for peace of mind\u003c\/li\u003e\n  \u003cli\u003eLifetime customer support available for guidance\u003c\/li\u003e\n  \u003cli\u003eCertified to common safety standards for consumer electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers, hobbyists and shop technicians who need a reliable, compact charger that can top up and maintain a range of 6V and 12V automotive batteries. It suits seasonal vehicle owners, restoration projects, everyday cars and light trucks, and anyone who prefers a low-maintenance, safety-focused charging solution that can be left connected for extended storage periods.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this charger be left connected indefinitely?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Its automatic float\/maintenance mode holds batteries at proper storage voltage for extended periods without overcharging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does it work with lithium batteries?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It supports LiFePO4 lithium batteries; select the correct voltage and follow battery maker guidelines for charging.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Battery Tender","offers":[{"title":"Default Title","offer_id":48082424758430,"sku":"B07XMJDJX7","price":118.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/battery-tender-4amp-front-view.jpg?v=1785811244","url":"https:\/\/northtrailauto.ca\/products\/battery-tender-4-amp-battery-charger-maintainer-switchable-6v-12v-smart-automatic-float-protection-for-cars-agm-lithium","provider":"North Trail Auto","version":"1.0","type":"link"}