12V & 36V Onboard Marine Lithium Battery Charger

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Two voltages · Two independent banks · One onboard charger 12V & 36V Onboard Marine Lithium Battery Charger | 2-Bank System The all-in-one 12V 36V onboard marine battery charger fo r a 12V cranking or house battery plus a native 36V LiFePO4 trolling-motor battery. Built for bass boats and mixed-voltage marine systems, the Epoch marine charger replaces separate chargers with one permanently mounted 2-bank marine charger. Its independent 12V 15A and 36V 10A outputs charge both batteries simultaneously, while IP67 construction, lithium BMS activation, M8 ring terminals, LED indicators, and built-in protection simplify every trip back to the dock. Plug in once. Recharge the cranking bank and trolling bank together. CHG-2BAY-12V36V 12V / 15A Bank 1 36V / 10A Bank 2 2 Independent banks IP67 Ingress rating 105–125VAC AC input M8 Ring terminals Smart mixed-voltage charging for modern boats Mixed-voltage charging 12V and 36V systems Selectable 12V modes LiFePO4, lead-acid, AGM 36V lithium bank Dedicated LiFePO4 output BMS activation Wake compatible lithium batteries Automatic shutdown Stops after full charge Built-in protection Reverse, short, heat, no-load Simplify Your Bass Boat: The All-In-One Charging Solution One AC plug replaces separate 12V and 36V chargers without combining the battery systems. Modern bass boats often use a 12V cranking or house battery alongside a native 36V lithium trolling-motor battery. This dual-voltage lithium charger manages those two systems independently, reducing portable-charger clutter, extension-cord juggling, and loose temporary clips around the bilge. The 12V output includes selectable chemistry modes, while the 36V output is dedicated to LiFePO4. Each bank has its own charging logic, status display, battery leads, and activation control. Dedicated 12V and 36V Charging Banks Bank 1 provides 12V at 15A with selectable LiFePO4, lead-acid, and AGM modes. Bank 2 provides 36V at 10A for a compatible native 36V LiFePO4 battery. Both banks can operate at the same time. Smart Charge Control and Lithium BMS Activation Charge output tapers as the battery fills, status changes from red to green, and the charger automatically stops after full charge. Compatible sleeping lithium batteries can be activated by holding the appropriate bank button for 3–5 seconds. Built to Survive Demanding Marine Environments Epoxy-filled ingress protection, active thermal management, and permanent bolted connections. IP67 Epoxy-Filled Construction The enclosure is filled with epoxy resin for IP67 ingress protection in correctly installed onboard environments. Inspect cables, glands, seals, mounting points, and the AC connection regularly; IP67 does not make damaged wiring or an unsafe installation acceptable. Aluminum Heat Sink and Waterproof Cooling Fan This is not a fanless charger. An aluminum housing, bottom cooling plate, and temperature-controlled waterproof fan work together to manage heat during charging. Maintain the required clearance and never block the fan or cooling surfaces. Secure Onboard Mounting Six mounting points, M6 hardware recommendations, pre-wired ring terminals, and a compact 10.79 × 9.65-inch footprint support permanent installation. Secure mounting helps prevent movement and cable fatigue during trailering and rough water. Easy Onboard Installation Bolt the ring terminals to the correct batteries, select the 12V chemistry, and connect one grounded AC plug. Red ring terminals connect to battery positive and black ring terminals to negative. Route each lead to its labeled battery voltage, protect the cables from abrasion, secure the charger to a rigid surface, and maintain more than 30mm of cooling clearance. Confirm polarity, voltage, battery chemistry, charge-current limits, and battery temperature before connecting the grounded AC supply. The protection circuits are safeguards—not permission to guess at the wiring. Compatible use cases Bass boats and other mixed-voltage marine battery systems. ✓ Bass boats using one 12V cranking or house battery and one native 36V LiFePO4 trolling-motor battery. ✓ Fishing boats, center consoles, pontoons, skiffs, and other mixed-voltage marine systems. ✓ Tournament anglers who want one onboard AC connection instead of carrying separate 12V and 36V chargers. ✓ 12V LiFePO4, lead-acid, or AGM batteries on the selectable 15A bank. ✓ Compatible 36V LiFePO4 trolling-motor batteries on the dedicated 10A bank. ✓ Permanent onboard installations with secure mounting, protected AC supply, and adequate cooling clearance. ✓ Sleeping lithium batteries that support charger-based BMS activation. Voltage and chemistry must match The 12V lead must go only to a compatible 12V battery in the correct selected mode. The 36V lead must go only to a compatible 36V LiFePO4 battery. Do not use the charger on unsupported voltages, dry-cell batteries, frozen batteries, or a damaged battery. Charger features Independent outputs, clear status, BMS activation, marine sealing, and built-in circuit protection. Independent 12V and 36V banks Charges one 12V battery and one 36V battery through separately managed outputs. 12V 15A output Selectable LiFePO4, lead-acid, or AGM charging mode through the front MODE control. 36V 10A lithium output Dedicated charging bank for a compatible native 36V LiFePO4 battery. Lithium BMS activation Press and hold the appropriate button for 3–5 seconds to wake a compatible sleeping BMS. Automatic full-charge shutdown Stops charge output after the connected battery reaches the charger's full-charge condition. LED status display Shows AC power, selected 12V battery type, charging progress, and full-charge status. IP67 epoxy-filled construction High ingress protection for correctly installed onboard marine use. Active temperature management Aluminum housing, cooling plate, and a temperature-controlled waterproof fan manage heat. Reverse-connection protection Helps protect the charger when battery polarity is connected incorrectly. Short-circuit and no-load protection Prevents normal charge output under a short circuit or when no battery is connected. Overcharge and overtemperature protection Built-in controls manage full-charge behavior and excessive internal temperature. Pre-wired M8 ring terminals Bolted red-positive and black-negative connections resist accidental disconnection. Complete the onboard charging system Pair the charger with compatible batteries, mounting, AC supply, and DC protection. Epoch 12V Cranking or House Battery Pair the selectable 12V bank with a compatible LiFePO4, AGM, or lead-acid battery profile. Epoch Native 36V Trolling-Motor Battery Use the dedicated 36V bank with a compatible single 36V LiFePO4 battery. Marine AC Extension Cord Use a correctly rated, grounded outdoor/marine cord and protected outlet when shore-power reach is required. Battery Disconnect and Overcurrent Protection The charger does not replace the boat's battery disconnects, branch fusing, or DC circuit protection. Secure Battery Trays and Hold-Downs Keep both batteries restrained for trailering, high-speed running, and rough water. Technical Specifications Exact input, output, compatibility, protection, construction, and mounting data. Identification Brand Epoch Batteries Product 12V & 36V Onboard Marine Lithium Battery Charger Model / SKU CHG-2BAY-12V36V Product type Two-bank mixed-voltage onboard marine battery charger Charging banks 2 independently operating banks AC Input Input voltage 105–125VAC Input frequency 60Hz AC connection Integrated grounded AC cord and plug Outlet requirement Correctly grounded 120V-class outlet within the published voltage range Bank 1 — 12V Output 12V / 15A Selectable battery modes LiFePO4, lead-acid, or AGM Mode selection Front-panel MODE button Lithium BMS activation Hold MODE for approximately 3–5 seconds Replacement fuse 20A Bank 2 — 36V Output 36V / 10A Battery compatibility Compatible 36V LiFePO4 battery only Battery chemistry selection Dedicated lithium output; no chemistry selection required Lithium BMS activation Hold ACTIVATE for approximately 3–5 seconds Replacement fuse 15A Indicators and Charge Behavior LED information AC power, 12V battery type, and charge-status indicators Charging indication Red Fully charged indication Green Full-charge behavior Automatically stops charging after the battery reaches full charge No-load behavior No normal DC charge output when a battery is not connected Connections and Construction Battery output connections M8 ring terminals Polarity identification Red positive; black negative/chassis Ingress protection IP67 Sealing method Epoxy-filled enclosure Housing Aluminum housing with bottom aluminum cooling plate Cooling Temperature-controlled waterproof cooling fan Protection Short-circuit protection Yes Reverse-connection protection Yes Overcharge protection Yes Overtemperature protection Yes No-load protection Yes Wrong-voltage warning Protection features do not permit connecting a bank to the wrong battery voltage Environmental and Mechanical Working temperature -20°C to 40°C / -4°F to 104°F Nominal working temperature 25°C / 77°F Product dimensions 274 × 245 × 99mm / approximately 10.79 × 9.65 × 3.90 in Mounting-hole diameter 6.5mm Recommended mounting hardware M6 screws appropriate for the mounting surface Required clearance More than 30mm around the charger; do not obstruct cooling surfaces or fan Mounting orientation Follow the supplied manual and keep leads, glands, indicators, and fan accessible Battery Compatibility Boundaries 12V bank Use the correct selectable mode for a compatible 12V LiFePO4, lead-acid, or AGM battery 36V bank Use only with a compatible 36V LiFePO4 battery Below-freezing charging Do not charge LiFePO4 below 0°C / 32°F unless the battery has approved heating or manufacturer permission Series-built 36V banks Verify manufacturer-approved charging and balancing; this charger is published for a compatible 36V LiFePO4 battery Other chemistries / voltages Not supported unless explicitly approved by Epoch and the battery manufacturer Marine charging safety note Battery charging combines shore power, high DC current, confined compartments, and wet environments. Use a grounded outlet and suitable shore-power practices. Disconnect AC before servicing battery connections. Never place tools across battery terminals, never charge a frozen or damaged battery, keep adequate ventilation around batteries and the charger, and follow the supplied manual plus each battery manufacturer's instructions. Use qualified marine-electrical help where required. Two-bank output visualizer Two voltage systems. Two independent charging banks. One onboard charger independently manages a 12V battery bank at up to 15A and a dedicated 36V LiFePO4 bank at up to 10A. AC INPUT 105–125V 60 Hz 2 BANKS ACTIVE ONBOARD CHARGER BANK 1 BANK 2 INDEPENDENT BANK 1 12V / 15A LiFePO4 · AGM · lead-acid modes INDEPENDENT BANK 2 36V / 10A AC input105–125V60 Hz 2-bank onboardChargerIndependent regulation Bank 112V / 15ASelectable chemistry Bank 236V / 10ALiFePO4 only Published output rating Voltage comparison Shared scale: 0–36V 12V bank 12V 36V bank 36V 0122436V Maximum rated current Current comparison Shared scale: 0–15A 12V bank 15A 36V bank 10A 051015A 01 12V bank15A output with selectable LiFePO4, AGM, and lead-acid modes. 02 36V bank10A output dedicated to compatible 36V LiFePO4 batteries. Visual compares the manufacturer’s published nominal bank ratings. It is not a measured voltage-versus-time charging curve; actual charging behavior depends on battery chemistry, state of charge, temperature, and BMS behavior. #epoch-dual-output { --epoch-bg: #07130f; --epoch-panel: #0d211a; --epoch-panel-2: #112a21; --epoch-text: #f3fbf6; --epoch-muted: #a8bcb1; --epoch-line: rgba(255, 255, 255, .13); --epoch-12: #45dc7d; --epoch-36: #55a8ff; --epoch-radius: 28px; background: radial-gradient(circle at 12% 0%, rgba(69, 220, 125, .16), transparent 34rem), radial-gradient(circle at 100% 30%, rgba(85, 168, 255, .13), transparent 34rem), var(--epoch-bg); color: var(--epoch-text); font-family: inherit; overflow: hidden; padding: clamp(48px, 7vw, 92px) 20px; } #epoch-dual-output *, #epoch-dual-output *::before, #epoch-dual-output *::after { box-sizing: border-box; } #epoch-dual-output .epoch-dual-output__shell { width: min(1220px, 100%); margin: 0 auto; } #epoch-dual-output .epoch-dual-output__header { max-width: 820px; margin: 0 auto 36px; text-align: center; 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Can I charge my 12V starting battery and 36V trolling-motor battery at the same time? Yes. The charger has two independently operating banks: a 12V 15A bank and a 36V 10A bank. The 12V bank can be set to LiFePO4, lead-acid, or AGM mode, while the 36V bank is dedicated to a compatible 36V LiFePO4 battery. Match each bank to the correct battery before connecting AC power. Can I use the 36V bank on three 12V batteries wired in series? Epoch publishes the 36V output for a compatible 36V LiFePO4 battery. Do not assume that one 36V output will correctly balance three independent 12V batteries connected in series. Follow the individual battery manufacturer's series-charging instructions; use a multi-bank 12V charger when each 12V battery must be charged and balanced separately. Can I permanently mount this charger inside my boat? Yes. It is designed as an onboard charger and uses an IP67 epoxy-filled enclosure. Mount it securely with the published 6.5mm mounting holes and appropriate M6 hardware, maintain more than 30mm of clearance, and keep the cooling area unobstructed. IP67 does not excuse damaged cables, loose glands, poor mounting, or unsafe AC connections. Is the charger fanless? No. The charger uses an aluminum housing and bottom cooling plate together with a temperature-controlled waterproof cooling fan. The fan operates as needed for heat management. Install the charger with the cooling surfaces and fan area clear of obstructions. Can I leave the charger connected after both batteries are full? The published charger logic automatically stops charging after a battery reaches full charge, and the LED changes from red to green. For extended unattended storage, follow the supplied charger manual and both battery manufacturers' storage guidance, inspect the installation periodically, and do not treat any charger as a substitute for proper battery maintenance and system isolation. Can the charger wake a lithium battery whose BMS has shut down? Yes, for compatible sleeping lithium batteries. Hold the MODE button on the 12V bank or the ACTIVATE button on the 36V bank for approximately 3–5 seconds. The activation feature is intended to wake a BMS that has entered low-voltage protection; it cannot repair a damaged, frozen, or unsafe battery. Can the 12V bank charge an AGM or lead-acid starting battery? Yes. The 12V bank provides selectable LiFePO4, lead-acid, and AGM modes through the MODE button. Confirm the battery manufacturer permits the selected charging profile. The 36V bank is LiFePO4-only and should not be used on 36V lead-acid or AGM batteries. What happens if I reverse the polarity? The charger includes reverse-connection and short-circuit protection. Even so, verify red-to-positive and black-to-negative before energizing the charger. Reverse-polarity protection does not make a wrong-voltage connection safe—never connect the 36V lead to a 12V battery or the 12V lead to a 36V battery. Can I charge a frozen LiFePO4 battery? No. Do not charge a frozen battery. Epoch states that LiFePO4 batteries should not be charged below 0°C / 32°F unless the battery has an approved internal heating system or its manufacturer expressly permits below-freezing charging. The charger does not replace the battery's low-temperature protection. How fast will each bank charge? Approximate charging time can be estimated by dividing the battery's amp-hour capacity by the bank's output—15A for the 12V bank and 10A for the 36V bank—then allowing additional time for charge tapering, balancing, temperature, and battery condition. Never exceed the battery manufacturer's maximum charge-current limit. { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Can I charge my 12V starting battery and 36V trolling-motor battery at the same time?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The charger has two independently operating banks: a 12V 15A bank and a 36V 10A bank. The 12V bank can be set to LiFePO4, lead-acid, or AGM mode, while the 36V bank is dedicated to a compatible 36V LiFePO4 battery. Match each bank to the correct battery before connecting AC power." } }, { "@type": "Question", "name": "Can I use the 36V bank on three 12V batteries wired in series?", "acceptedAnswer": { "@type": "Answer", "text": "Epoch publishes the 36V output for a compatible 36V LiFePO4 battery. Do not assume that one 36V output will correctly balance three independent 12V batteries connected in series. Follow the individual battery manufacturer's series-charging instructions; use a multi-bank 12V charger when each 12V battery must be charged and balanced separately." } }, { "@type": "Question", "name": "Can I permanently mount this charger inside my boat?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. It is designed as an onboard charger and uses an IP67 epoxy-filled enclosure. Mount it securely with the published 6.5mm mounting holes and appropriate M6 hardware, maintain more than 30mm of clearance, and keep the cooling area unobstructed. IP67 does not excuse damaged cables, loose glands, poor mounting, or unsafe AC connections." } }, { "@type": "Question", "name": "Is the charger fanless?", "acceptedAnswer": { "@type": "Answer", "text": "No. The charger uses an aluminum housing and bottom cooling plate together with a temperature-controlled waterproof cooling fan. The fan operates as needed for heat management. Install the charger with the cooling surfaces and fan area clear of obstructions." } }, { "@type": "Question", "name": "Can I leave the charger connected after both batteries are full?", "acceptedAnswer": { "@type": "Answer", "text": "The published charger logic automatically stops charging after a battery reaches full charge, and the LED changes from red to green. For extended unattended storage, follow the supplied charger manual and both battery manufacturers' storage guidance, inspect the installation periodically, and do not treat any charger as a substitute for proper battery maintenance and system isolation." } }, { "@type": "Question", "name": "Can the charger wake a lithium battery whose BMS has shut down?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, for compatible sleeping lithium batteries. Hold the MODE button on the 12V bank or the ACTIVATE button on the 36V bank for approximately 3–5 seconds. The activation feature is intended to wake a BMS that has entered low-voltage protection; it cannot repair a damaged, frozen, or unsafe battery." } }, { "@type": "Question", "name": "Can the 12V bank charge an AGM or lead-acid starting battery?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The 12V bank provides selectable LiFePO4, lead-acid, and AGM modes through the MODE button. Confirm the battery manufacturer permits the selected charging profile. The 36V bank is LiFePO4-only and should not be used on 36V lead-acid or AGM batteries." } }, { "@type": "Question", "name": "What happens if I reverse the polarity?", "acceptedAnswer": { "@type": "Answer", "text": "The charger includes reverse-connection and short-circuit protection. Even so, verify red-to-positive and black-to-negative before energizing the charger. Reverse-polarity protection does not make a wrong-voltage connection safe—never connect the 36V lead to a 12V battery or the 12V lead to a 36V battery." } }, { "@type": "Question", "name": "Can I charge a frozen LiFePO4 battery?", "acceptedAnswer": { "@type": "Answer", "text": "No. Do not charge a frozen battery. Epoch states that LiFePO4 batteries should not be charged below 0°C / 32°F unless the battery has an approved internal heating system or its manufacturer expressly permits below-freezing charging. The charger does not replace the battery's low-temperature protection." } }, { "@type": "Question", "name": "How fast will each bank charge?", "acceptedAnswer": { "@type": "Answer", "text": "Approximate charging time can be estimated by dividing the battery's amp-hour capacity by the bank's output—15A for the 12V bank and 10A for the 36V bank—then allowing additional time for charge tapering, balancing, temperature, and battery condition. Never exceed the battery manufacturer's maximum charge-current limit." } } ] } Show more