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The Epoch 12V and 36V Onboard Marine Lithium Battery Charger is an all-in-one 2-bank charger for a 12V cranking or house battery plus a native 36V LiFePO4 trolling-motor battery. Two voltages, two independent banks, one onboard charger.
Built for bass boats and mixed-voltage marine systems, it replaces separate chargers with one permanently mounted unit. 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. At a glance: 12V / 15A bank 1, 36V / 10A bank 2, 2 independent banks, IP67, 105–125VAC input, M8 ring terminals.
Key Features
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Mixed-voltage charging: 12V and 36V systems.
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Selectable 12V modes: LiFePO4, lead-acid, and AGM.
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36V lithium bank: Dedicated LiFePO4 output.
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BMS activation: Wakes compatible lithium batteries.
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Automatic shutdown: Stops after full charge.
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Built-in protection: Reverse-connection, short-circuit, overtemperature, and no-load protection.
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.
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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.
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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.
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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.
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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.
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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.
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.
Charger features
- 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
- 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 or 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.
Suitable For:
- 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
Compare
| Bank |
Voltage |
Max current |
Battery modes |
| Bank 1 |
12V |
15A |
LiFePO4, AGM, lead-acid |
| Bank 2 |
36V |
10A |
LiFePO4 only |
Certifications & Standards
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IP67: Epoxy-filled enclosure for IP67 ingress protection in correctly installed onboard environments; IP67 does not make damaged wiring or an unsafe installation acceptable.
Please Note: The 36V bank is LiFePO4-only; never connect the 36V lead to a 12V battery or the 12V lead to a 36V battery.
Please Note: For three 12V batteries in series, use a multi-bank 12V charger when each battery must be charged and balanced separately.
Please Note: Requires a correctly grounded 120V-class outlet (105–125VAC, 60Hz).
Please Note: Do not charge LiFePO4 below 0°C / 32°F unless the battery has approved heating or manufacturer permission.
Please Note: Does not replace the boat's battery disconnects, branch fusing, or DC circuit protection.
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Specifications
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
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Recommended Charging Settings
Approximate charging time can be estimated by dividing the battery's amp-hour capacity by the bank's output, then allowing additional time for charge tapering, balancing, temperature, and battery condition.
- 12V bank: battery Ah divided by 15A.
- 36V bank: battery Ah divided by 10A.
- Never exceed the battery manufacturer's maximum charge-current limit.
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 and protect the cables from abrasion.
- Secure the charger to a rigid surface using the 6.5mm mounting holes and M6 hardware, 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.
How it works: one AC input, two independent banks
- AC input: 105–125V, 60 Hz, feeding a 2-bank onboard charger with independent regulation.
- Bank 1: 12V / 15A with selectable LiFePO4, AGM, and lead-acid modes.
- Bank 2: 36V / 10A, dedicated to compatible 36V LiFePO4 batteries.
- These are the manufacturer's published nominal bank ratings, not a measured voltage-versus-time charging curve; actual charging behavior depends on battery chemistry, state of charge, temperature, and BMS behavior.
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CHG-2BAY-12V36V / CHG-4BAY-12V10A User Manual
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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.
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Epoch Batteries Limited Warranty
Warranty Period
2-year limited warranty on Epoch-branded chargers (Epoch general warranty terms)
Epoch Batteries-branded products are covered against qualifying defects in materials and workmanship for the applicable warranty period, subject to Epoch's model-specific remedy schedule and the terms of its warranty policy. Epoch-branded chargers carry a 2-year limited warranty and accessories (such as fuel gauges and voltage reducers) a 1-year limited warranty, from the original purchase date.
Registration
Register your battery with Epoch within 90 days of purchase for full warranty coverage. If it is not registered within that time, the warranty period begins from the battery's original manufacturing date. Proof of ownership is required for any claim, and coverage is non-transferable and applies only to the original purchaser.
Remedy
After inspection and testing, Epoch will provide the applicable remedy for a qualifying manufacturing defect: an approved repair, a replacement, or a comparable-product offer according to the model's schedule. Typical repair turnaround is 3–10 business days once the product is received.
Exclusions
Coverage may be denied when a failure is caused by misuse, improper handling, installation or storage, or use outside the product's specifications. Examples include an unsecured battery; loose, corroded or improperly connected terminals; series or parallel connections beyond the manufacturer's recommendations; reverse polarity or short circuits; impact, fire or water submersion; storage above 140°F or below -40°F; prolonged storage fully discharged or batteries left uncharged for more than three months; poor crimps, undersized cables or damaged wiring; opened, modified or tampered products; and use in applications the battery was not designed for, including repeated engine starting on non-cranking models.
Obtaining Warranty Service
Start a claim through the Epoch Batteries Warranty Portal with your model and serial number, proof of purchase, a description of the issue and supporting photos or videos. If approved, Epoch provides an RMA number and packing instructions. Do not ship a product without a valid RMA. The customer arranges and pays for shipment to Epoch, packaged in compliance with lithium battery shipping rules. Epoch Batteries can be reached at 1-888-501-1846 or support@epochbatteries.com.
Visit Epoch's Warranty Page to review the full warranty terms.
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Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.
Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.
Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.
For more information about shipping, please visit our complete Shipping Policy.
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Why Shop With Eco Emperor?
At Eco Emperor, our mission is to empower you to lead a sustainable and fun lifestyle with ease and confidence. Whether you're upgrading your outdoor experience or enhancing your eco-conscious journey, here’s why choosing us is a decision you can feel great about:
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Our knowledgeable and friendly team is here to support you every step of the way. We pride ourselves on providing personalized service and swift responses to ensure a smooth and satisfying experience. Our dedicated team is available via phone, email, and live chat to provide you with prompt and helpful support.
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