{"product_id":"battery-tender-4-bank-12v-battery-charger-maintainer","title":"Battery Tender 4-Bank 12V Battery Charger and Maintainer","description":"\u003cp class=\"nvn-hero\"\u003eThe Battery Tender 4-Bank Battery Management System charges and maintains up to four separate 12-volt batteries at once, each on its own 1.25-amp bank. Fully automatic 4-step charging for AGM, gel, and flooded lead-acid batteries. Perfect for anyone juggling a car, bike, boat, and a battery or two in storage.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Battery Tender 4-Bank Battery Management System is built for the person who's always got more than one 12-volt battery to look after. Car in the garage. Motorcycle. The boat down at the slip. Maybe a classic that only comes out on nice weekends. This unit gives you four completely separate charging banks in one box, so every battery gets its own dedicated 1.25-amp feed instead of taking turns.\u003c\/p\u003e\n\u003cp\u003eEach bank runs Battery Tender's BTP microprocessor charging, the same 4-step fully automatic process the brand is known for. It reads the battery, charges it, tops it off, then drops into a float maintenance mode that keeps it at full without cooking it. That's the whole point of a maintainer. You set it and forget it. Leave it connected all winter and your battery is ready to crank in spring instead of sitting there sulfated and flat.\u003c\/p\u003e\n\u003cp\u003eThe 4-step sequence is what separates this from an old-school trickle charger. Step one initializes and checks the battery. Step two runs the bulk charge to bring it up. Step three tops it off and holds it. Step four settles into float, feeding just enough to offset natural self-discharge. A dumb trickle charger just pushes current the whole time, which is exactly how batteries get overcharged and dried out. This one backs off when the battery's full and wakes back up when it needs to.\u003c\/p\u003e\n\u003cp\u003eBecause the four banks are independent, you can mix and match. Start battery on one, house battery on another, a windlass or accessory battery on a third, the motorcycle on the fourth. One bank finishing early doesn't slow the others down. And since each bank is isolated, you're not fighting isolator or combiner headaches to charge batteries that live on different systems.\u003c\/p\u003e\n\u003cp\u003eIt handles the three lead-acid chemistries you'll actually run into: AGM, gel, and standard flooded. The 1.25 amps per bank is a maintainer-class current, not a fast bulk charger. That's by design. It's the right rate for keeping healthy batteries healthy over weeks and months of storage, and it's gentle enough that you never have to babysit it. If you're trying to jump a dead-flat deep-cycle bank back to life in an hour, that's a different tool. This one is about keeping good batteries good.\u003c\/p\u003e\n\u003cp\u003eEach bank comes with its own set of alligator combo clips, and the quick-connect design means you can leave the harness on the battery and just snap the charger on and off. The whole unit measures 8.8 inches long by 7 inches wide by 3.5 inches tall, so it tucks onto a garage shelf, a workbench, or a bulkhead without eating much room. The AC power cord is 6 feet, which gives you a bit of reach to a wall outlet.\u003c\/p\u003e\n\u003cp\u003eWho's this really for? Anybody running a small fleet. Powersports folks with a bike, a quad, and a side-by-side that all sit between rides. Collectors with a couple of classics on maintainers year-round. Boaters juggling a start battery and a house bank over the off-season. Fleet and shop owners who'd rather spend a couple hundred bucks once than keep buying replacement batteries because something got left to die. A 4-bank unit is the natural pick when a single-bank tender means you're constantly moving it around.\u003c\/p\u003e\n\u003cp\u003eA couple of honest notes from people who've lived with these. Give it a few inches of clearance for airflow, and mount it vertically if you're bolting it to a wall so it breathes. Keep it out of standing water and spray. The alligator clips and the housing aren't meant for a wet bilge or an exposed deck, so if you're maintaining a boat battery, put the charger somewhere dry and run the clips to the battery. Treat it right and it'll quietly keep four batteries alive for years.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eFour independent charging banks, each with its own 1.25-amp output, so every battery charges on its own schedule\u003c\/li\u003e\n  \u003cli\u003e4-step fully automatic charging: initialize, bulk, absorption, then float maintenance\u003c\/li\u003e\n  \u003cli\u003eBTP microprocessor technology reads each battery and adjusts, no overcharging and no babysitting\u003c\/li\u003e\n  \u003cli\u003eWorks with 12-volt AGM, gel, and flooded lead-acid batteries\u003c\/li\u003e\n  \u003cli\u003eQuick-connect design lets you leave the harness on the battery and snap the charger on and off\u003c\/li\u003e\n  \u003cli\u003eFour sets of alligator combo clips included, one per bank\u003c\/li\u003e\n  \u003cli\u003e6-foot AC power cord for reach to a wall outlet\u003c\/li\u003e\n  \u003cli\u003eCompact 8.8 x 7 x 3.5-inch housing fits a shelf, bench, or bulkhead\u003c\/li\u003e\n  \u003cli\u003eFloat mode keeps stored batteries topped off through winter without drying them out\u003c\/li\u003e\n  \u003cli\u003eSet-it-and-forget-it operation, safe to leave connected long term\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Battery Tender reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan it charge four batteries at the same time?\u003c\/summary\u003e\n    \u003cp\u003eYes. It has four completely separate banks, each with its own 1.25-amp output. Every battery charges independently, so one finishing early doesn't hold up the others.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a charger or a maintainer?\u003c\/summary\u003e\n    \u003cp\u003eBoth. Each bank runs a 4-step fully automatic cycle that charges the battery up, then drops into float to maintain it. At 1.25 amps per bank it's tuned for maintaining and topping off healthy batteries, not for fast-charging a dead-flat pack.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat battery types does it work with?\u003c\/summary\u003e\n    \u003cp\u003eIt's designed for 12-volt lead-acid batteries in three chemistries: AGM, gel, and standard flooded. It reads and adjusts to each one automatically.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I leave it connected all winter?\u003c\/summary\u003e\n    \u003cp\u003eYes, that's exactly what it's built for. Once a battery is topped off, each bank settles into float mode and feeds just enough current to offset self-discharge, so your batteries are ready to go in spring.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the charging current per bank?\u003c\/summary\u003e\n    \u003cp\u003e1.25 amps per bank. That's a maintainer-class rate, gentle enough to leave connected long term without cooking the battery.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it work on 6-volt batteries?\u003c\/summary\u003e\n    \u003cp\u003eNo. This unit is for 12-volt batteries only.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat comes in the box?\u003c\/summary\u003e\n    \u003cp\u003eThe charger, four separate sets of alligator combo clips (one per bank), and a 6-foot AC power cord.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it on my motorcycle, ATV, and boat?\u003c\/summary\u003e\n    \u003cp\u003eYes. Any 12-volt AGM, gel, or flooded lead-acid battery works, so you can run a car, motorcycle, ATV, side-by-side, or boat battery on different banks at the same time.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much room does it need?\u003c\/summary\u003e\n    \u003cp\u003eThe housing is 8.8 inches long by 7 inches wide by 3.5 inches tall. Give it a few inches of clearance for airflow, and mount it vertically if you're bolting it to a wall.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I mount it in a boat bilge or somewhere it might get wet?\u003c\/summary\u003e\n    \u003cp\u003eNo. The clips and housing aren't meant for a wet bilge or exposed deck. If you're maintaining a boat battery, keep the charger in a dry spot and run the clips out to the battery.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eBattery Tender 4-Bank 12V Battery Charger and Maintainer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eBattery Tender\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e022-0148-DL-WH\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e734357214819\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Voltage\u003c\/th\u003e\n\u003ctd\u003e12 Volt\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNumber of Banks\u003c\/th\u003e\n\u003ctd\u003e4 (independent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharging Current\u003c\/th\u003e\n\u003ctd\u003e1.25 Amp per bank\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Types Supported\u003c\/th\u003e\n\u003ctd\u003eAGM, Gel, Flooded Lead-Acid\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharging Stages\u003c\/th\u003e\n\u003ctd\u003e4 Step Fully Automatic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharging Technology\u003c\/th\u003e\n\u003ctd\u003eBTP Microprocessor Technology\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions (L x W x H)\u003c\/th\u003e\n\u003ctd\u003e8.8 in x 7 in x 3.5 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Connections\u003c\/th\u003e\n\u003ctd\u003eFour separate alligator combo clips\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAC Power Cord Length\u003c\/th\u003e\n\u003ctd\u003e6 feet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnection Type\u003c\/th\u003e\n\u003ctd\u003eQuick-connect harness\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHousing Color\u003c\/th\u003e\n\u003ctd\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can it charge four batteries at the same time?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It has four completely separate banks, each with its own 1.25-amp output. Every battery charges independently, so one finishing early doesn't hold up the others.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a charger or a maintainer?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Both. Each bank runs a 4-step fully automatic cycle that charges the battery up, then drops into float to maintain it. At 1.25 amps per bank it's tuned for maintaining and topping off healthy batteries, not for fast-charging a dead-flat pack.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What battery types does it work with?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's designed for 12-volt lead-acid batteries in three chemistries: AGM, gel, and standard flooded. It reads and adjusts to each one automatically.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I leave it connected all winter?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, that's exactly what it's built for. Once a battery is topped off, each bank settles into float mode and feeds just enough current to offset self-discharge, so your batteries are ready to go in spring.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the charging current per bank?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"1.25 amps per bank. That's a maintainer-class rate, gentle enough to leave connected long term without cooking the battery.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it work on 6-volt batteries?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This unit is for 12-volt batteries only.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What comes in the box?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The charger, four separate sets of alligator combo clips (one per bank), and a 6-foot AC power cord.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it on my motorcycle, ATV, and boat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Any 12-volt AGM, gel, or flooded lead-acid battery works, so you can run a car, motorcycle, ATV, side-by-side, or boat battery on different banks at the same time.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much room does it need?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The housing is 8.8 inches long by 7 inches wide by 3.5 inches tall. Give it a few inches of clearance for airflow, and mount it vertically if you're bolting it to a wall.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I mount it in a boat bilge or somewhere it might get wet?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. The clips and housing aren't meant for a wet bilge or exposed deck. If you're maintaining a boat battery, keep the charger in a dry spot and run the clips out to the battery.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Battery Tender","offers":[{"title":"Default Title","offer_id":44996599906397,"sku":"2007960","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_d4b25972-b786-4a3a-ab8e-bbe01536916a.png?v=1788628146","url":"https:\/\/nvnmarine.com\/products\/battery-tender-4-bank-12v-battery-charger-maintainer","provider":"NVN Marine","version":"1.0","type":"link"}