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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 for 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.
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.
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.
Maximum rated current
Current comparison
12V bank
15A output with selectable LiFePO4, AGM, and lead-acid modes.
36V bank
10A 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.
Frequently asked questions
12V & 36V Onboard Marine Charger FAQs
Common questions about simultaneous charging, battery chemistry, onboard mounting, BMS activation, cooling, and protection.
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.