{"product_id":"relion-rb100-hp-12v-100ah-group-31-lithium-battery","title":"RELiON RB100-HP Group 31 12V 100Ah Lithium Dual-Purpose Battery","description":"\u003cp class=\"nvn-hero\"\u003eThe RELiON RB100-HP is a Group 31 12.8V, 100Ah LiFePO4 battery built as a dual-purpose unit, so it'll crank a small outboard and carry your house loads from the same case. Standard Group 31 size, roughly half the weight of lead-acid, and far more usable capacity.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe RELiON RB100-HP takes the familiar Group 31 footprint and drops in lithium where you used to run lead-acid. It's a 12.8V, 100 amp-hour LiFePO4 battery built as a dual-purpose unit, so it'll crank a small outboard and still carry your house loads through a long day on the water. Same box size you already have room for. A whole lot less weight to haul around.\u003c\/p\u003e\n\u003cp\u003eDual purpose is the part worth slowing down on. A lot of lithium batteries are deep-cycle only and won't handle the current spike of an engine start. The HP in this one stands for the higher-performance cells RELiON uses to make it do both. That means one battery can start a small kicker or outboard and run your electronics, livewell pump, and lights between starts. On a center console or a bay boat where space and weight both matter, that flexibility is the whole point.\u003c\/p\u003e\n\u003cp\u003eFitment is straightforward. The case measures 13 inches long, 6.8 wide, and 8.8 tall, which is standard Group 31, so it'll sit in the same tray and box as the lead-acid battery you're replacing. The top terminals are M8 threaded studs, so you can bolt your existing lugs right on. We'd tell you to add a lock washer and snug them down properly. Vibration on an outboard transom will back a plain nut off over a season, and you don't want a loose lithium terminal.\u003c\/p\u003e\n\u003cp\u003eThe big win is weight. A Group 31 AGM or flooded battery is a back-breaker to wrestle into a locker. Swapping to LiFePO4 cuts that roughly in half, and on a smaller skiff that weight coming off the stern actually helps the boat get up on plane. The chemistry also gives you far more usable capacity. You can pull a lithium battery down deep without hurting it, where a lead-acid battery really only wants to give up about half its rated amp-hours before you start shortening its life.\u003c\/p\u003e\n\u003cp\u003eValue shows up over time, too. LiFePO4 batteries hold up for thousands of charge cycles, far more than you'll ever squeeze out of a lead-acid Group 31 that gets cycled hard. So the higher sticker price spreads out over years of service instead of a battery you're swapping every couple of seasons. For a boat that gets real use, that math tends to land in lithium's favor.\u003c\/p\u003e\n\u003cp\u003eThere's a battery management system built into the case that watches cell voltage, temperature, and current, and it'll shut things down to protect itself if something goes sideways. One thing to get right at install is your charging voltage. Lithium wants a charger or alternator regulator set for a LiFePO4 profile. Leave an old regulator pinned at a high lead-acid absorption voltage and you'll stress the BMS over time. A DC-to-DC charger between the engine and the battery is the clean way to charge off an outboard, and it's what we'd point most rigs toward.\u003c\/p\u003e\n\u003cp\u003eAnd it isn't only a boat battery. The same dual-purpose Group 31 lithium is a favorite in RV house banks, van builds, and small off-grid solar setups, anywhere you want a lot of usable power in a case you can actually lift on your own. Building a bigger house bank? These can be wired in parallel to add capacity. Just match your batteries and follow RELiON's guidance on how many you can string together safely.\u003c\/p\u003e\n\u003cp\u003eIf you've been on the fence about moving a Group 31 over to lithium, the RB100-HP is an easy place to start. You get the weight savings, the deeper usable capacity, and the dual-purpose flexibility to crank and cycle from one battery. We stock them, we ship same day on in-stock units, and we're glad to talk through your charging setup before you buy.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eGroup 31 case at 13 x 6.8 x 8.8 inches drops into the same tray and box as the lead-acid battery you're replacing\u003c\/li\u003e\n  \u003cli\u003e12.8V nominal, 100Ah LiFePO4 chemistry for far more usable capacity than a comparable lead-acid battery\u003c\/li\u003e\n  \u003cli\u003eDual-purpose design cranks a small outboard or kicker and runs house loads from one battery\u003c\/li\u003e\n  \u003cli\u003eM8 threaded stud top terminals accept your existing lugs, add a lock washer for vibration\u003c\/li\u003e\n  \u003cli\u003eRoughly half the weight of a Group 31 AGM or flooded battery, weight that comes off the stern\u003c\/li\u003e\n  \u003cli\u003eBuilt-in battery management system guards against over-voltage, over-current, and temperature extremes\u003c\/li\u003e\n  \u003cli\u003eABS case stands up to cockpit spray and engine-bay heat\u003c\/li\u003e\n  \u003cli\u003eParallel-capable to build a larger house bank when you need more capacity\u003c\/li\u003e\n  \u003cli\u003eDeep discharge without the damage lead-acid takes, so you get more of the rated 100Ah every cycle\u003c\/li\u003e\n  \u003cli\u003eThousands of charge cycles for years of service on a boat that gets used hard\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 RELiON 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\u003eWhat does dual purpose mean on the RB100-HP?\u003c\/summary\u003e\n    \u003cp\u003eIt means the battery handles both jobs. It can crank a small outboard or kicker with the current spike an engine start needs, and it can cycle deep to run your house loads. A lot of lithium batteries are deep-cycle only and won't crank an engine. This one does both, which is why the HP cells matter.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this drop into my existing Group 31 tray?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's a standard Group 31 case at 13 inches long, 6.8 wide, and 8.8 tall, so it sits in the same tray and box as the lead-acid Group 31 you're pulling out. The top terminals are M8 threaded studs, so your existing lugs bolt right on.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it to start my outboard?\u003c\/summary\u003e\n    \u003cp\u003eYes, that's the dual-purpose part. The higher-performance cells handle the cranking current of a small outboard or kicker. For a big high-displacement engine, check the cranking requirement against your engine's spec first, but for most small-to-mid outboards it's a fit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much lighter is it than my lead-acid battery?\u003c\/summary\u003e\n    \u003cp\u003eRoughly half the weight of a comparable Group 31 AGM or flooded battery. On a smaller skiff, taking that weight off the stern actually helps the boat get up on plane.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat charger do I need for it?\u003c\/summary\u003e\n    \u003cp\u003eA charger or alternator regulator set for a LiFePO4 profile. Don't leave an old regulator pinned at a high lead-acid absorption voltage, since that stresses the BMS over time. Charging off an outboard, a DC-to-DC charger between the engine and the battery is the clean way to do it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I wire two in parallel for a bigger house bank?\u003c\/summary\u003e\n    \u003cp\u003eYes, these are parallel-capable. Match your batteries and follow RELiON's guidance on how many you can string together safely, then you've got a larger bank with the same lithium advantages.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow long will a lithium Group 31 like this last?\u003c\/summary\u003e\n    \u003cp\u003eLiFePO4 batteries hold up for thousands of charge cycles, far longer than a lead-acid Group 31 that gets cycled hard. On a boat that sees real use, the longer service life is where the higher upfront cost earns itself back.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it have a battery management system?\u003c\/summary\u003e\n    \u003cp\u003eYes. There's a BMS built into the case that watches cell voltage, temperature, and current, and it'll shut things down to protect itself if a fault shows up.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat kind of terminals does it use?\u003c\/summary\u003e\n    \u003cp\u003eM8 threaded studs on top. That lets you bolt your existing 4\/0 or smaller lugs straight on. Add a lock washer and snug them properly, because transom vibration will loosen a plain nut over a season.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it in an RV or off-grid solar setup?\u003c\/summary\u003e\n    \u003cp\u003eYes. The same dual-purpose Group 31 lithium is popular in RV house banks, van builds, and small off-grid solar setups. Anywhere you want a lot of usable power in a case you can actually lift, it fits.\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\u003eGroup 31 12 Volt 100 AH Lithium Dual Purpose Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eRELiON\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eRB100-HP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e00850025732253\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Group Size\u003c\/th\u003e\n\u003ctd\u003eGroup 31\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Voltage\u003c\/th\u003e\n\u003ctd\u003e12.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRated Capacity\u003c\/th\u003e\n\u003ctd\u003e100 Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eChemistry\u003c\/th\u003e\n\u003ctd\u003eLithium Iron Phosphate (LiFePO4)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Type\u003c\/th\u003e\n\u003ctd\u003eDual Purpose (starting and deep cycle)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Type\u003c\/th\u003e\n\u003ctd\u003eM8 Threaded Stud, Top Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions (L x W x H)\u003c\/th\u003e\n\u003ctd\u003e13 in x 6.8 in x 8.8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCase Material\u003c\/th\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003e13 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e6.8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHeight\u003c\/th\u003e\n\u003ctd\u003e8.8 in\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\": \"What does dual purpose mean on the RB100-HP?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It means the battery handles both jobs. It can crank a small outboard or kicker with the current spike an engine start needs, and it can cycle deep to run your house loads. A lot of lithium batteries are deep-cycle only and won't crank an engine. This one does both, which is why the HP cells matter.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will this drop into my existing Group 31 tray?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's a standard Group 31 case at 13 inches long, 6.8 wide, and 8.8 tall, so it sits in the same tray and box as the lead-acid Group 31 you're pulling out. The top terminals are M8 threaded studs, so your existing lugs bolt right on.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it to start my outboard?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, that's the dual-purpose part. The higher-performance cells handle the cranking current of a small outboard or kicker. For a big high-displacement engine, check the cranking requirement against your engine's spec first, but for most small-to-mid outboards it's a fit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much lighter is it than my lead-acid battery?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Roughly half the weight of a comparable Group 31 AGM or flooded battery. On a smaller skiff, taking that weight off the stern actually helps the boat get up on plane.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What charger do I need for it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A charger or alternator regulator set for a LiFePO4 profile. Don't leave an old regulator pinned at a high lead-acid absorption voltage, since that stresses the BMS over time. Charging off an outboard, a DC-to-DC charger between the engine and the battery is the clean way to do it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I wire two in parallel for a bigger house bank?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, these are parallel-capable. Match your batteries and follow RELiON's guidance on how many you can string together safely, then you've got a larger bank with the same lithium advantages.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How long will a lithium Group 31 like this last?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"LiFePO4 batteries hold up for thousands of charge cycles, far longer than a lead-acid Group 31 that gets cycled hard. On a boat that sees real use, the longer service life is where the higher upfront cost earns itself back.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it have a battery management system?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. There's a BMS built into the case that watches cell voltage, temperature, and current, and it'll shut things down to protect itself if a fault shows up.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What kind of terminals does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"M8 threaded studs on top. That lets you bolt your existing 4\/0 or smaller lugs straight on. Add a lock washer and snug them properly, because transom vibration will loosen a plain nut over a season.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it in an RV or off-grid solar setup?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The same dual-purpose Group 31 lithium is popular in RV house banks, van builds, and small off-grid solar setups. Anywhere you want a lot of usable power in a case you can actually lift, it fits.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"RELiON","offers":[{"title":"Default Title","offer_id":44786927566941,"sku":"2007076","price":999.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_3374d6ff-89b6-4095-9dba-cfbba4f1d59a.png?v=1784987127","url":"https:\/\/nvnmarine.com\/products\/relion-rb100-hp-12v-100ah-group-31-lithium-battery","provider":"NVN Marine","version":"1.0","type":"link"}