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Four batteries · Four smart banks · One onboard charger
4-Bank Onboard Marine Lithium Battery Charger | 10A Per Bank (40A Total)
The all-in-one bass boat charging solution for four individual 12V batteries—including common three-battery trolling systems plus a cranking or house battery.
The Epoch 4-bank lithium charger delivers four independent 12V / 10A outputs from one permanently mounted marine unit. Each bank has its own LiFePO4, lead-acid, or AGM setting, BMS activation control, and charge-status display—giving tournament anglers fast overnight charging without carrying four separate chargers.
Smart onboard charging for every battery
The Ultimate Charging Solution for 36V Trolling Systems
Charge three individual 12V trolling batteries and one 12V cranking battery from one onboard unit.
A common tournament-bass configuration uses three 12V batteries to create a 36V trolling-motor bank, plus a fourth 12V battery for engine starting, electronics, livewells, and accessories. This 4-bank onboard charger gives every battery its own 10A charging channel.
Connect one red/black output pair to each individual 12V battery. Because the live product page does not publish a formal galvanic-isolation rating, confirm the supplied charger manual and each battery manufacturer's approved method before charging a series-connected bank with the interconnect jumpers left in place.
True 10 Amps Per Bank
Each independent channel is rated at 10A. With four banks charging at full output, the charger provides up to 40A of aggregate nominal charging capacity instead of dividing one small current rating between every battery.
Individual Charging for Series-Bank Balance
Connecting a charger bank to each 12V battery helps reduce battery-to-battery imbalance within an approved 24V, 36V, or 48V series string. The charger fills each battery individually; internal cell balancing is still handled by each battery's BMS.
LiFePO4, Lead-Acid, or AGM Per Bank
Each output has its own MODE control. Select Lithium, lead-acid, or AGM for the battery attached to that bank before charging—ideal for boats that use lithium trolling batteries with a separate AGM cranking battery.
Built for Demanding Marine Environments
Epoxy-filled ingress protection, active cooling, and bolted battery connections.
IP67 Epoxy-Filled Enclosure
The charger enclosure is filled with pure epoxy resin for IP67 ingress protection. Keep the AC plug and battery ring terminals dry and protected, and do not submerge the charger or use it with a wet plug.
Active Aluminum Cooling System
This model is not fanless. The aluminum housing and bottom cooling plate work with a temperature-controlled waterproof fan. Maintain more than 30mm of clearance and never block the fan or heat-dissipation surfaces.
Secure Onboard Connections
Pre-wired M8 ring terminals bolt directly to each battery. Permanent connections reduce the risk of loose temporary clips, while rigid mounting helps limit movement and cable fatigue during trailering and rough-water operation.
Easy Onboard Installation
Mount once, connect one output to each battery, select every chemistry, and charge the boat through one AC cord.
Use the 6.5mm mounting holes and appropriate M6 fasteners to secure the charger to a rigid surface. Maintain the required cooling clearance, protect all leads from abrasion, connect red to battery positive and black to negative, then select the correct mode for each bank before energizing AC power.
Battery type cannot be changed while a bank is charging. Disconnect that bank's DC ring terminals before changing its selected mode.
Compatible use cases
Bass boats, trolling-motor banks, cranking batteries, and four-battery marine systems.
- ✓ Three 12V trolling-motor batteries plus one 12V cranking or house battery, subject to approved series-charging instructions.
- ✓ Four separate 12V LiFePO4 batteries in bass boats, fishing boats, pontoons, and center consoles.
- ✓ Mixed 12V battery chemistries when each bank is individually set to LiFePO4, lead-acid, or AGM mode.
- ✓ Tournament fishing setups that need overnight charging from one onboard AC connection.
- ✓ 12V marine electronics, house, cranking, trolling, auxiliary, or generator batteries within each battery's charge limits.
- ✓ Permanent onboard installations with protected AC power, secure mounting, ventilation clearance, and inspected cabling.
- ✓ Compatible sleeping lithium batteries that support charger-based BMS activation.
Charger features
Fast per-bank charging, mixed-chemistry flexibility, BMS activation, active cooling, and circuit protection.
Complete the onboard battery system
Pair the charger with compatible batteries, mounting, shore-power equipment, and DC protection.
Technical Specifications
Exact output, input, chemistry, connection, cooling, protection, and mounting details.
| Identification | |
|---|---|
| Brand | Epoch Batteries |
| Product | 4-Bank 12V Marine Battery Charger | 10A Per Bank |
| Model / SKU | CHG-4BAY-12V10A |
| Product type | Four-bank onboard marine battery charger with pre-wired M8 ring terminals |
| Charging banks | 4 independently operating 12V banks |
| AC Input | |
| Input voltage | 105–125VAC |
| Input frequency | 60Hz |
| AC connection | Integrated grounded AC cord and North American plug |
| Input limitation | Not a universal 120/240V charger |
| DC Outputs | |
| Number of outputs | 4 |
| Bank voltage | 12V per bank |
| Bank current rating | 10A per bank |
| Aggregate nominal bank rating | 4 × 10A = 40A when all banks deliver full rated current |
| Battery connection rule | One red/black output pair connects to one individual 12V battery |
| Output connectors | M8 ring terminals; red positive and black negative/chassis |
| Replacement fuse | 15A for each 12V / 10A output |
| Battery Compatibility and Controls | |
| Supported battery voltage | 12V batteries only on every bank |
| Selectable chemistries | LiFePO4, lead-acid, or AGM, selected independently per bank |
| Mode control | Dedicated MODE control for each charging bank |
| Changing battery type | Cannot be changed while that bank is charging; disconnect its DC output before changing mode |
| Lithium BMS activation | Select Lithium mode, then hold MODE for approximately 3–5 seconds |
| Cold-weather lithium charging | Do not charge below 0°C / 32°F unless the battery has approved heating or manufacturer permission |
| Indicators and Charge Behavior | |
| AC power indication | Yes |
| Battery-type indication | Yes, individually by bank |
| Charging indication | Red |
| Fully charged indication | Green |
| Full-charge behavior | Automatically shuts down charging after the battery reaches full charge |
| No-load behavior | No normal charging output when no compatible battery is connected |
| Construction and Cooling | |
| Ingress protection | IP67 enclosure |
| Sealing method | Filled with pure epoxy resin |
| Housing | Aluminum housing with bottom aluminum cooling plate |
| Cooling | Temperature-controlled waterproof cooling fan; not fanless |
| Marine-use boundary | Do not submerge; keep AC plug and ring terminals dry and protected |
| Protection | |
| Short-circuit protection | Yes |
| Reverse-connection protection | Yes |
| Overcharge protection | Yes |
| Overtemperature protection | Yes |
| No-load protection | Yes |
| Wrong-voltage limitation | Protection features do not permit use on a native 24V, 36V, or 48V battery |
| Environmental and Mechanical | |
| Working temperature | -20°C to 40°C / -4°F to 104°F |
| Nominal working temperature | 25°C / 77°F |
| Product dimensions | 284 × 245 × 99mm / approximately 11.18 × 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; do not obstruct the fan or heat-dissipation surfaces |
| Published weight | Not listed on the current product page |
| Published warranty term | Not listed on the current product page |
| Series-System Use | |
| Common 36V application | Three separate 12V batteries in series, with one charger bank connected to each battery |
| Fourth-bank application | One separate 12V cranking, starting, house, or electronics battery |
| Series-jumper guidance | Verify the supplied charger manual and battery manufacturer's approved in-place charging method |
| Balance clarification | The charger can charge each 12V battery individually; internal cell balancing remains the battery BMS's function |
| Doubling banks on one battery | Not recommended |
Charging and marine safety note
Verify voltage, polarity, chemistry, temperature, charge-current limits, and series-charging instructions before connecting AC power.
Disconnect AC before servicing battery leads. Never charge a frozen or damaged battery, never place conductive tools across terminals, and do not use the charger with a wet AC plug. Protection features reduce risk but do not make incorrect battery voltage, unsupported chemistry, or poor installation safe.
Epoch 4-Bank Marine Charger FAQs
Common questions about 36V trolling systems, charging time, mixed battery chemistries, onboard mounting, cooling, and lithium activation.
Can I use this 4-bank charger with a 36V trolling-motor system?
Yes, when the 36V system is made from three compatible 12V batteries and each charger bank is connected to one individual 12V battery. The fourth charger bank can serve a separate 12V cranking or house battery. Epoch describes the outputs as independent, but the live page does not publish a formal galvanic-isolation specification; confirm the supplied charger manual and each battery manufacturer's series-charging instructions before leaving series jumpers connected.
How long will 10A per bank take to recharge my batteries?
A basic estimate is battery capacity divided by 10A. A 50Ah battery may need about five hours of bulk charging, while a 100Ah battery may need about ten hours. Real charging time is normally longer because current tapers near full charge and depends on starting state of charge, temperature, battery condition, balancing, and the selected chemistry profile.
Does each bank really provide 10A at the same time?
Epoch rates each of the four independent outputs at 12V and 10A. That represents up to 40A of aggregate nominal charging capacity when all four banks are operating at their full individual ratings. Actual current can taper independently as each battery approaches full charge.
Can I leave the charger connected after the batteries are full?
The published charging logic automatically shuts down a bank after its battery reaches the charger's full-charge condition, and the indicator changes from red to green. For long unattended storage, follow the supplied charger manual and every battery manufacturer's storage guidance, inspect the installation periodically, and isolate the system when required.
Can I connect two charger banks to one battery for 20A charging?
No. Each charger bank should be connected to one individual 12V battery. Combining two smart outputs on one battery can cause the channels to interfere with each other's sensing and charging logic. Use a correctly rated single-bank charger when a battery requires more than 10A.
Can I charge one AGM starting battery and three LiFePO4 trolling batteries?
Yes, provided every battery is 12V and each charger bank is set to the chemistry connected to that bank. Each output has its own MODE control for LiFePO4, lead-acid, or AGM. Battery type cannot be changed while that bank is charging; disconnect the DC ring terminals before changing the mode.
Is this charger fanless?
No. The charger uses an aluminum housing and bottom cooling plate together with a temperature-controlled waterproof cooling fan. Keep the fan and heat-dissipation surfaces unobstructed and maintain the published mounting clearance.
Can I permanently mount it in a marine battery compartment?
Yes. It is an onboard charger with an IP67 epoxy-filled enclosure, 6.5mm mounting holes, and recommended M6 mounting hardware. Maintain more than 30mm of clearance and protect the AC plug and battery ring terminals from rain, snow, standing water, and physical damage. Epoch specifically says not to submerge the charger or use it with a wet AC plug.
Can it wake a lithium battery whose BMS has shut down?
Yes, for compatible deeply discharged LiFePO4 batteries. Select Lithium mode on the relevant bank and hold its MODE button for approximately three to five seconds. BMS activation cannot repair a damaged, frozen, or otherwise unsafe battery.
Can I charge a native 24V, 36V, or 48V battery with one bank?
No. Every charger output is a 12V / 10A bank intended for one compatible 12V battery. The charger can support a higher-voltage system only when that system consists of individual 12V batteries and the battery manufacturer permits in-place multi-bank charging.
Can I charge LiFePO4 batteries below freezing?
Do not charge LiFePO4 below 0°C / 32°F unless the battery has an approved internal heating system or its manufacturer explicitly permits below-freezing charging. The charger's operating-temperature rating does not override the battery's low-temperature charge limit.