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The Epoch 4-Bank Onboard Marine Lithium Battery Charger is an all-in-one bass boat charging solution for four individual 12V batteries, including common three-battery trolling systems plus a cranking or house battery. Four batteries, four smart banks, one onboard charger.
It 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. At a glance: 4 independent banks, 10A per bank, 40A aggregate nominal, 12V each output, IP67 enclosure, M8 ring terminals.
Key Features
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Four independent banks: One battery per output.
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Selectable chemistry: LiFePO4, lead-acid, and AGM.
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Lithium activation: Wakes a compatible BMS.
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LED status: Mode and charge visibility.
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Automatic shutdown: Stops after full charge.
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Built-in protection: Short-circuit, reverse-connection, overtemperature, and no-load protection.
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 Epoch does not publish a formal galvanic-isolation rating for this charger, 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.
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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.
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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.
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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.
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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.
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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.
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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.
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.
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4: Independent banks
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12V: Each battery bank
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10A: Maximum per bank
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40A: Aggregate nominal
Charger features
- Four independent 12V outputs: charge and maintain up to four individual 12V batteries from one onboard unit.
- True 10A bank rating: each output is rated at 10A rather than sharing one low-current output among all four batteries.
- 40A aggregate nominal capacity: four 10A outputs provide up to 40A combined nominal charging when all banks operate at full rating.
- Individual chemistry selection: set every bank independently for LiFePO4, lead-acid, or AGM with its own MODE control.
- Per-battery series-bank charging: each 12V battery in an approved series system receives its own charger connection, helping maintain battery-to-battery balance.
- Lithium BMS activation: hold the MODE button for three to five seconds after selecting Lithium mode.
- Automatic full-charge shutdown: charging stops after a bank reaches the charger's full-charge condition.
- At-a-glance indicators: shows AC power, selected battery type, charging status, and full-charge status for each bank.
- IP67 epoxy-filled enclosure: high ingress protection for correctly installed onboard environments.
- Active thermal management: aluminum housing, bottom cooling plate, and a temperature-controlled waterproof fan.
- M8 ring-terminal leads: bolted red-positive and black-negative connections resist accidental disconnection.
- Circuit protection: includes short-circuit, reverse-connection, overcharge, overtemperature, and no-load protection.
Complete the onboard battery system
- Epoch 12V trolling-motor batteries: use one charger bank per compatible 12V battery in an approved 24V, 36V, or 48V series system.
- Epoch cranking or house battery: use the fourth bank for a compatible 12V starting, electronics, or house battery.
- Marine AC extension cord: use a grounded, correctly rated outdoor or marine cord and a protected 120V outlet when additional reach is required.
- Battery trays and hold-downs: secure every battery for trailering, rough water, and high-speed operation.
- Battery disconnects and fusing: the charger does not replace the boat's battery switches, source protection, or branch overcurrent protection.
Suitable For:
- 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
Certifications & Standards
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IP67: Enclosure filled with pure epoxy resin for IP67 ingress protection; do not submerge the charger or use it with a wet AC plug.
Please Note: Every bank is for one individual 12V battery only; not for native 24V, 36V, or 48V batteries, and do not connect two banks to one battery.
Please Note: Galvanic isolation is not published; confirm the manual and battery manufacturer's instructions before charging a series bank with jumpers in place.
Please Note: Input is 105–125VAC, 60Hz with a North American plug; not a universal 120/240V charger.
Please Note: Do not submerge or use with a wet AC plug. 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 switches, source protection, or branch overcurrent protection.
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Specifications
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
Published warranty term: Not listed on the 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
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Recommended Charging Settings
A basic estimate is battery capacity divided by 10A. 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.
- 50Ah battery: about five hours of bulk charging.
- 100Ah battery: about ten hours of bulk charging.
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 more than 30mm of cooling clearance and protect all leads from abrasion.
- Connect red to battery positive and black to negative, one red/black output pair per individual 12V battery.
- 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.
- Do not connect two charger banks to one battery.
How it works: four separate 10A channels
- AC input: 105–125V, 60 Hz, feeding a four-bank onboard charger with independent mode, status, and regulation.
- Banks 1 to 4: 12V / 10A each, one 12V battery per bank.
- 4 × 10A = 40A total aggregate nominal capacity. That is four separate 10A channels, not one combinable 40A output.
- One bank per battery: each red/black output pair connects to one compatible individual 12V battery.
- Mode selected per bank: LiFePO4, AGM, or lead-acid can be selected independently for every channel.
- Current is not divided: every bank is rated at 10A; one battery's state does not turn the others into shared outputs.
- Independent completion: each channel can taper and stop when its own battery reaches the charger's full-charge condition. At the same moment, one channel can be delivering full rated current, another tapering, a third complete, and the fourth still charging (Epoch's hypothetical example: 10A, about 6A, 0A, and about 8A).
- These are published nominal ratings, not a measured voltage-versus-time charging curve. 12V identifies the supported nominal battery class; actual charging behavior varies with the selected chemistry, battery 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 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 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.
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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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