{"product_id":"relion-rb36v40-36v-40ah-group-31-lithium-battery","title":"Relion RB36V40 36V 40Ah Group 31 LiFePO4 Deep Cycle Battery","description":"\u003cp class=\"nvn-hero\"\u003eThe Relion RB36V40 packs 36 volts and 40 amp-hours of lithium iron phosphate into a single Group 31 case. It's built to run 36 volt trolling motors off one battery instead of a three-battery lead-acid bank. M8 stud terminals, an IP67 ABS case, and 175 amps of peak discharge mean it holds up to real days on the water.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Relion RB36V40 is a 36 volt, 40 amp-hour lithium iron phosphate battery in a standard Group 31 case. If you run a 36 volt trolling motor, this is the kind of battery that changes how you rig the bow. Instead of stacking three 12 volt lead-acid batteries in series and eating all that weight up front, you drop in one LiFePO4 pack and wire it straight to the motor.\u003c\/p\u003e\n\u003cp\u003eLet's talk about what that means on the water. A 36 volt trolling motor pulls hard, and lead-acid banks sag under that load and give back only about half their rated capacity before the voltage drops too low to be useful. LiFePO4 is a different animal. This pack holds a nearly flat voltage deep into the discharge, so your motor keeps full thrust right up until the battery is close to empty. You get the usable capacity you paid for, not just the top half. Relion rates it at 99 percent efficiency, and 40 amp-hours at 36 volts is real, deliverable energy for a day of fishing. And it's a fraction of the weight of the three-battery lead-acid bank it replaces, which is weight you feel every time you load the boat and every time you're up on plane.\u003c\/p\u003e\n\u003cp\u003eThe RB36V40 puts out 175 amps of peak discharge current. That headroom matters when a high-thrust motor spikes on start-up, or when you punch it to reposition against wind and current. The internal battery management system watches cell voltage, temperature, and current, so the pack protects itself without you thinking about it. LiFePO4 packs like this one also cycle far more times than lead-acid before they wear out, which is why the up-front cost pencils out over a few seasons.\u003c\/p\u003e\n\u003cp\u003eInstall is straightforward if you've wired a battery before. The case measures 13 inches long by 6.8 inches wide by 8.4 inches tall, so it drops into a standard Group 31 tray. Terminals are M8 threaded studs on top, which take a proper ring lug torqued down tight. That stud connection is far more secure than a post clamp under the constant vibration of a boat pounding across chop. Use marine-grade lugs, get them torqued to spec, and seal them against corrosion. If you're mounting in a tight console, measure your hold-down and hatch clearance first, since the 8.4 inch height is a little taller than some lead-acid Group 31 batteries.\u003c\/p\u003e\n\u003cp\u003eThe case is molded ABS and carries an IP67 ingress rating, so it shrugs off bilge spray, rain, and a washdown at the ramp. The battery itself is certified to UN38.3, CE, and UKCA, and the cells inside are UL1642 and IEC62133 certified. That certification stack matters if you ever ship the battery, and it tells you the cells have been through real safety testing, not just a spec sheet.\u003c\/p\u003e\n\u003cp\u003eOne thing to get right is charging. A LiFePO4 pack wants a lithium-profile charger. Use a 36 volt charger set for lithium, or a lithium-compatible on-board charger, and it'll top off fast and hold a long service life. A charger locked to an old lead-acid-only profile can confuse the BMS and cut out mid-charge, so match the charger to the chemistry. If you're charging off the outboard's alternator, plan on a DC-to-DC converter rather than a direct connection.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anglers running 36 volt bow-mount motors on bass boats, bay boats, and center consoles who are tired of hauling and replacing lead-acid banks every couple of seasons. It's not the battery for a 12 volt or 24 volt motor, and it's not a starting battery for your outboard. It's a deep-cycle battery for a 36 volt trolling system, and on the right boat it saves weight, saves space, and just plain lasts.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e36 volts and 40 amp-hours of LiFePO4 capacity in a single Group 31 case, so one battery replaces a three-battery lead-acid bank\u003c\/li\u003e\n  \u003cli\u003eGroup 31 footprint at 13 in long by 6.8 in wide by 8.4 in tall, drops into a standard Group 31 tray\u003c\/li\u003e\n  \u003cli\u003eM8 threaded stud top terminals for a solid, torqued lug connection that holds up to constant vibration\u003c\/li\u003e\n  \u003cli\u003e175 amp peak discharge current feeds high-thrust 36 volt trolling motors without sagging\u003c\/li\u003e\n  \u003cli\u003e99 percent usable efficiency delivers nearly the full 40 Ah to the motor, not just the top half like lead-acid\u003c\/li\u003e\n  \u003cli\u003eFlat LiFePO4 discharge curve keeps the motor at full speed until the pack is nearly empty\u003c\/li\u003e\n  \u003cli\u003eIP67-rated molded ABS case shrugs off bilge spray, rain, and washdown at the ramp\u003c\/li\u003e\n  \u003cli\u003eBuilt-in battery management system monitors cell voltage, temperature, and current for self-protection\u003c\/li\u003e\n  \u003cli\u003eCertified to UN38.3, CE, and UKCA at the battery level, with UL1642 and IEC62133 certified cells\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\u003eWill this battery run my 36 volt trolling motor?\u003c\/summary\u003e\n    \u003cp\u003eYes. The RB36V40 is a 36 volt nominal pack with 40 amp-hours of capacity and 175 amps of peak discharge, so it's built to power a 36 volt bow-mount motor from a single battery instead of three 12 volt lead-acid batteries wired in series.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size battery is this?\u003c\/summary\u003e\n    \u003cp\u003eIt's a Group 31 case, 13 inches long by 6.8 inches wide by 8.4 inches tall, with M8 threaded stud top terminals. It drops into a standard Group 31 tray, though the 8.4 inch height can be a little taller than some lead-acid Group 31 batteries, so check your hold-down and hatch clearance.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow long will it run on the water?\u003c\/summary\u003e\n    \u003cp\u003eThat depends on your motor's thrust and how hard you run it. You've got 40 amp-hours at 36 volts of usable energy, and because LiFePO4 holds a flat voltage deep into the discharge, you get nearly all of that capacity instead of the roughly half a lead-acid bank gives back.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it need a special charger?\u003c\/summary\u003e\n    \u003cp\u003eYes. Use a 36 volt charger set for lithium, or a lithium-compatible on-board charger. A charger locked to an old lead-acid-only profile can confuse the battery management system and cut out mid-charge, so match the charger to the LiFePO4 chemistry.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat terminals does it use and how do I connect it?\u003c\/summary\u003e\n    \u003cp\u003eM8 threaded studs on top. Use marine-grade ring lugs torqued to spec and seal them against corrosion. The stud connection holds far better than a post clamp under the vibration of a boat running across chop.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it sealed against water?\u003c\/summary\u003e\n    \u003cp\u003eThe molded ABS case carries an IP67 ingress rating, so it handles bilge spray, rain, and a washdown at the ramp. It's still smart to keep the terminals clean and sealed against salt corrosion over the long haul.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it safety certified?\u003c\/summary\u003e\n    \u003cp\u003eYes. The battery is certified to UN38.3, CE, and UKCA, and the cells inside are UL1642 and IEC62133 certified. That's a full safety-testing stack, which also matters if you ever need to ship the battery.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between a Group 24 and a Group 31 battery?\u003c\/summary\u003e\n    \u003cp\u003eGroup 31 is the larger case size and carries more capacity and power output than a Group 24. For a 36 volt trolling setup where you want the most runtime and thrust headroom, the Group 31 form factor is the one to reach for.\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\u003eNo. This is a deep-cycle battery built for the sustained draw of a 36 volt trolling motor, not the high cranking burst an outboard starter needs. Keep it on your trolling system and use a dedicated starting battery for the outboard.\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\u003eRelion RB36V40 36V 40Ah Group 31 LiFePO4 Deep Cycle 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\u003eRB36V40\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e00850044617623\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\u003e36 Volt\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e40 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\u003eDeep 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 8.4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePeak Discharge Current\u003c\/th\u003e\n\u003ctd\u003e175 A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eEfficiency\u003c\/th\u003e\n\u003ctd\u003e99 Percent\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\u003eIngress Protection\u003c\/th\u003e\n\u003ctd\u003eIP67\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBattery Certifications\u003c\/th\u003e\n\u003ctd\u003eUN38.3, CE, UKCA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCell Certifications\u003c\/th\u003e\n\u003ctd\u003eUL1642, IEC62133\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\": \"Will this battery run my 36 volt trolling motor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The RB36V40 is a 36 volt nominal pack with 40 amp-hours of capacity and 175 amps of peak discharge, so it's built to power a 36 volt bow-mount motor from a single battery instead of three 12 volt lead-acid batteries wired in series.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size battery is this?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a Group 31 case, 13 inches long by 6.8 inches wide by 8.4 inches tall, with M8 threaded stud top terminals. It drops into a standard Group 31 tray, though the 8.4 inch height can be a little taller than some lead-acid Group 31 batteries, so check your hold-down and hatch clearance.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How long will it run on the water?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"That depends on your motor's thrust and how hard you run it. You've got 40 amp-hours at 36 volts of usable energy, and because LiFePO4 holds a flat voltage deep into the discharge, you get nearly all of that capacity instead of the roughly half a lead-acid bank gives back.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it need a special charger?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Use a 36 volt charger set for lithium, or a lithium-compatible on-board charger. A charger locked to an old lead-acid-only profile can confuse the battery management system and cut out mid-charge, so match the charger to the LiFePO4 chemistry.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What terminals does it use and how do I connect it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"M8 threaded studs on top. Use marine-grade ring lugs torqued to spec and seal them against corrosion. The stud connection holds far better than a post clamp under the vibration of a boat running across chop.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it sealed against water?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The molded ABS case carries an IP67 ingress rating, so it handles bilge spray, rain, and a washdown at the ramp. It's still smart to keep the terminals clean and sealed against salt corrosion over the long haul.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it safety certified?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The battery is certified to UN38.3, CE, and UKCA, and the cells inside are UL1642 and IEC62133 certified. That's a full safety-testing stack, which also matters if you ever need to ship the battery.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between a Group 24 and a Group 31 battery?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Group 31 is the larger case size and carries more capacity and power output than a Group 24. For a 36 volt trolling setup where you want the most runtime and thrust headroom, the Group 31 form factor is the one to reach for.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it to start my outboard?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This is a deep-cycle battery built for the sustained draw of a 36 volt trolling motor, not the high cranking burst an outboard starter needs. Keep it on your trolling system and use a dedicated starting battery for the outboard.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Relion","offers":[{"title":"Default Title","offer_id":44786915475549,"sku":"2007070","price":1089.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_27b19b66-ee52-46d1-a001-ffca2acde779.png?v=1784986317","url":"https:\/\/nvnmarine.com\/products\/relion-rb36v40-36v-40ah-group-31-lithium-battery","provider":"NVN Marine","version":"1.0","type":"link"}