12V 300Ah Cranking & Deep Cycle Lithium Battery (Dual Purpose) - Pro Series
IP67BluetoothHeated
$1,599
In Stock
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A modern bass boat is a demanding electrical platform. A 200- to 250-horsepower outboard, a high-thrust GPS trolling motor, dual livewells, shallow-water anchors, pumps, lighting and several large sonar displays can all compete for battery power. An aging lead-acid bank may feel adequate at launch, then lose voltage and reserve as the day progresses—exactly when you need dependable cranking, strong Spot-Lock performance and clear forward-facing sonar before weigh-in.
Epoch bass boat lithium batteries let anglers build the boat around the job each battery must perform. Native 24V and 36V LiFePO4 batteries provide deep-cycle power for compatible trolling motors. Cranking-capable dual-purpose batteries deliver the short, high-current burst required by approved outboards while also supporting house electronics. Dedicated 12V house batteries isolate graphs, sonar modules and pumps from the starting circuit when maximum system separation is the priority.
The best bass boat battery is therefore not one universal model. It is a correctly engineered combination of voltage, amp-hour capacity, continuous current, cranking capability, charging equipment, cable size and physical fitment. A full Epoch bass boat lithium upgrade can reduce stern weight, simplify rigging and provide more consistent voltage from first cast to final run back to the ramp.
Stable voltage matters to trolling motors, sonar displays and pumps. The representative graph below shows why a 12V LiFePO4 battery can keep equipment operating more consistently: lithium stays near its normal working voltage through much of the cycle, while lead-acid voltage declines progressively as capacity is used.
A native-voltage battery can replace multiple 12V batteries in a compatible trolling system. Epoch's 24V 60Ah Pro Series battery stores 1.54kWh, weighs about 30 pounds and supports 80A continuous output. The 36V 50Ah battery stores 1.92kWh, weighs about 35 pounds and supports 100A continuous output.
For heavier wind, current or longer tournament days, the 36V 100Ah battery provides 3.84kWh and 120A continuous output. One native 36V battery can replace three compatible 12V batteries, freeing space and eliminating two series jumpers.
A standard deep-cycle lithium battery must not be assumed capable of starting a large outboard. Epoch's 12V 172Ah dual-purpose battery uses a cranking-capable BMS, providing 200A continuous output and a 1,000A five-second starting pulse in a 40-pound Group 31 footprint.
The larger 12V 300Ah Pro Series dual-purpose battery provides 300A continuous output, 1,000A for five seconds and 800A for ten seconds, plus 3.84kWh for electronics and house loads. Outboard, alternator, charger and wiring compatibility must be verified before installation.
A separate 12V house bank isolates forward-facing sonar, chartplotters, livewells, pumps, radios and lighting from engine-starting events. Epoch's fish finder battery collection includes compact 50Ah and 100Ah-class options for electronics-focused systems.
Extreme tournament rigs may benefit from a dedicated house battery even when a dual-purpose cranking battery has ample capacity. Separation improves fault isolation and lets the electronics bank be sized around actual daily amp-hour demand rather than starter requirements.
Amp-hours describe stored capacity; they do not prove that a battery can start an engine. A starter motor demands a brief surge of hundreds of amps. A deep-cycle BMS is optimized for sustained accessory power and may disconnect when that surge exceeds its limit. The comparison below uses two current Epoch models to show the difference.
The key distinction: a deep-cycle battery is not inferior—it is designed for a different job. Use deep-cycle lithium for trolling motors and sustained house loads. Use a battery specifically approved for cranking when the circuit must start an outboard.
Forward-facing sonar systems, black boxes and multiple 10- to 16-inch displays need clean, dependable 12V power. When electronics share a weak starting battery, the voltage dip during engine cranking can cause displays to dim, reboot or lose network connections. Long wire runs, undersized conductors, loose terminals and overloaded distribution blocks can make the problem worse.
A properly sized Epoch house battery helps reduce that brownout risk by providing stable LiFePO4 voltage and isolating electronics from the starter circuit. Run the electronics through appropriately sized marine cable, individual fusing and a quality distribution block rather than stacking numerous small wires directly on a battery post. Size the bank by adding the actual current draw of every display, sonar module, livewell, pump and accessory, then multiplying by expected hours of use and adding a practical reserve.
A compatible dual-purpose battery can also support both the outboard and house loads, reducing battery count. For the most power-hungry tournament rigs, a separate house battery provides the greatest isolation and keeps the cranking reserve dedicated to getting back to weigh-in.
Side-by-side specs
Every battery in this collection uses LiFePO4 chemistry with a built-in battery management system (BMS). Compare stored energy, continuous output, weight, footprint, and price side by side.
11 models · Select a column heading to sort
| Model | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 300Ah | 3.84 kWh | 300A | 81 lbs | 19.7 × 10.5 × 9.8 | 6,000+ | 11 yr | IP67 | Bluetooth: yes | Heated: yes | Victron communications: yes |
 | 60Ah | 1.54 kWh | 80A | 30 lbs | 12.3 × 6.8 × 9 | 6,000+ | 11 yr | IP67 | Bluetooth: yes | Heated: yes | Victron communications: yes |
 | 50Ah | 0.64 kWh | 50A | 14 lbs | 9 × 5.6 × 8.3 | 4,000+ | 11 yr | IP54 | Bluetooth: yes | Heated: no | Victron communications: no |
 | 105Ah | 1.34 kWh | 105A | 22.1 lbs | 10.3 × 6.8 × 9 | 4,000+ | 11 yr | IP54 | Bluetooth: yes | Heated: yes | Victron communications: no |
 | 172Ah | 2.20 kWh | 200A | 40 lbs | 12.9 × 6.2 × 8.5 | 4,000+ | 11 yr | IP65 | Bluetooth: yes | Heated: no | Victron communications: no |
 | 300Ah | 3.84 kWh | 200A | 58 lbs | 13.8 × 7.6 × 10 | 4,000+ | 11 yr | IP54 | Bluetooth: yes | Heated: yes | Victron communications: no |
 | 50Ah | 1.92 kWh | 100A | 35 lbs | 13 × 6.8 × 9.4 | 4,000+ | 11 yr | IP65 | Bluetooth: yes | Heated: yes | Victron communications: no |
 | 100Ah | 1.28 kWh | 100A | 21 lbs | 10.3 × 6.8 × 9 | 4,500+ | 6 yr | IP54 | Bluetooth: no | Heated: no | Victron communications: no |
A modern bass boat is more than a hull, motor and trolling motor. It is a complete electrical platform that may include a high-horsepower outboard, GPS anchoring, forward-facing sonar, multiple large displays, livewell pumps, bilge pumps, shallow-water anchors, lighting, radios, networking equipment and other accessories.
All of those systems depend on the batteries hidden beneath the deck.
A weak battery setup can create slow cranking, dim displays, sonar reboots, reduced trolling-motor thrust and uncertainty about whether enough power remains to finish the tournament day. A properly designed Epoch lithium bass boat battery system gives every major load the voltage, capacity and current it needs.
Epoch offers purpose-built 12V, 24V and 36V LiFePO4 batteries for:
What separates Epoch from a generic lithium battery is the complete ecosystem surrounding the battery.
Depending on the model, Epoch bass boat batteries may include:
The best bass boat battery is not simply the battery with the highest amp-hour number. It is the complete system that starts the engine, keeps the electronics stable, powers the trolling motor through changing conditions and recharges correctly before the next launch.
Tournament anglers cannot control the weather, current, fishing pressure or how far they must run between productive areas. They can control the quality of the electrical system they install.
Epoch lithium bass boat batteries are designed to help remove battery performance from the list of things an angler must worry about.
Lead-acid battery voltage falls progressively as capacity is used. It may sag even more under a heavy load, such as high trolling-motor thrust, several sonar displays or an engine-starting event.
LiFePO4 batteries maintain a flatter working voltage through most of the usable discharge.
That helps compatible equipment operate more consistently throughout the day:
Lithium does not increase equipment beyond its designed output. It helps the equipment receive dependable voltage through more of the battery’s usable capacity.
Lead-acid batteries are commonly operated within a conservative depth-of-discharge range to protect cycle life.
Epoch LiFePO4 batteries are designed for much deeper routine cycling within the limits of the selected model. That allows a greater share of the rated capacity to support actual fishing-day loads.
A lithium battery with a lower nominal amp-hour rating may therefore provide practical runtime comparable to a much larger lead-acid bank that is operated conservatively.
A traditional tournament bass boat may carry three lead-acid trolling batteries plus a separate cranking battery. That bank can weigh several hundred pounds before trays, cables and hardware are included.
Epoch gives anglers several ways to remove that weight:
Removing unnecessary battery weight may improve holeshot, shallow-water draft, handling, trailer load and access to the rigging compartment. Results depend on hull design, load placement, propeller, engine setup and total boat weight.
Epoch LiFePO4 batteries require:
Normal marine inspections still matter. Owners should periodically check battery restraints, terminal torque, fuses, breakers, cables, charger connections and compartment drainage.
Marine battery safety should be built in layers. It should never depend on one marketing phrase or one component.
Epoch’s safety-first approach combines model-specific layers such as:
No battery is immune to damage from incorrect installation, reversed polarity, undersized cables, unsupported charging equipment or physical abuse. Epoch’s advantage is that the battery begins with multiple protection layers instead of forcing the customer to depend entirely on external equipment.
Epoch bass boat batteries use lithium iron phosphate chemistry.
LiFePO4 is widely selected for deep-cycle marine applications because it combines stable chemistry, a flat discharge curve and long service life.
Chemistry is only the first safety layer. The quality of the BMS, charger, enclosure, installation and circuit protection also matters.
The Battery Management System monitors the battery while it is charging, discharging and stored.
Depending on the model, the BMS helps protect against:
The BMS must also allow the battery to perform its intended job.
A dual-purpose cranking battery needs a BMS capable of supporting a large starter-motor surge. A trolling-motor battery needs sustained current capability. An electronics battery needs dependable deep-cycle capacity and stable voltage.
Epoch publishes these model-specific ratings so the battery can be selected for the actual load.
Select Epoch batteries carry battery-pack certification rather than relying only on cell-level documentation.
The 12V 300Ah Pro Series dual-purpose battery is listed with UL 1973 certification at the assembled battery-pack level.
That distinction matters because a complete battery certification evaluates the assembled system rather than only one component inside it.
Other Epoch bass boat batteries publish different model-specific certifications and compliance information, which may include:
Certifications differ by model. Always review the exact product page and technical documents for the battery being considered.
Bass boat compartments encounter rain, spray, humidity, rough water and occasional water intrusion.
Epoch offers model-specific enclosure protection:
Current examples include:
An IP rating does not make the complete installation waterproof. Exposed terminals, breakers, plugs, busbars, charger leads and cable connections must still be protected.
Do not intentionally submerge a battery, allow it to sit in standing water or pressure-wash the terminals.
LiFePO4 cells should not normally be charged below their approved temperature without a suitable heating strategy.
Select Epoch trolling and Pro Series batteries include internal heating. When charging power is available and the cells are too cold, the battery can use incoming energy to warm the cells before normal charging begins.
Heating can be valuable for:
Internal heating is model-specific.
The 12V 172Ah dual-purpose battery, for example, includes low-temperature charge protection but does not include internal self-heating. Always compare the exact model’s charging-temperature specifications.
Bass boats experience repeated impact, vibration and rapid changes in electrical demand.
The battery and its mounting system must be designed for that environment.
A lead-acid battery is often held partly in place by its own weight. A much lighter lithium battery can move more easily if it is placed loosely in an oversized tray.
Epoch offers batteries in familiar marine footprints and an exact-fit tray for the 36V 50Ah Group 31 model.
A properly sized tray or hold-down helps prevent:
Always secure the battery mechanically. Never rely on cable tension or battery weight to hold it in position.
A trolling motor may operate at low current while making small positioning corrections, then demand substantially more power when holding a heavy boat in wind or accelerating away from an obstacle.
Current Epoch trolling options provide model-specific continuous output such as:
The battery’s continuous rating must meet or exceed the trolling motor’s maximum required battery current.
The breaker, plug, cable and connectors must also support that current.
A standard deep-cycle lithium battery should not automatically be used as an engine-starting battery.
Starting a large outboard can require hundreds of amps for several seconds. A deep-cycle BMS may disconnect if the starter exceeds its short-duration current limit.
Epoch dual-purpose batteries use cranking-capable BMS designs.
The 12V 172Ah Group 31 dual-purpose battery provides:
The larger 12V 300Ah Pro Series provides:
Outboard compatibility must always be verified. Confirm the engine manufacturer’s cranking requirements, alternator behavior, charging voltage, cable size, fuse requirements and battery guidance before installation.
One of the weaknesses of a traditional battery system is limited visibility.
The angler may know that the motor still runs but not how much usable energy remains or how quickly a particular load is consuming it.
Bluetooth-equipped Epoch batteries connect to a compatible Epoch mobile app.
Depending on the battery and app version, available information may include:
This helps anglers answer practical questions:
Because LiFePO4 voltage remains relatively flat, direct BMS state-of-charge information is more useful than trying to estimate remaining capacity from voltage alone.
Select Pro Series batteries support app-based firmware updates.
This allows compatible battery software to be updated without removing and shipping the battery solely for routine software changes.
Select Pro Series batteries include CAN-bus and RS485 communications for compatible power-system integration.
This can be useful in advanced bass boats, multi-use boats and marine electrical systems that include:
Not every bass boat requires a connected Victron energy system, but the communication capability gives professional installers and advanced owners a path to deeper monitoring and coordinated charging.
A bass boat battery system commonly performs three different functions:
One battery may perform more than one job, but each job must be considered separately.
A 12V bass boat battery may be used for engine starting, electronics, livewell pumps, lighting or a small 12V trolling motor.
The correct battery depends on whether the circuit requires cranking power, deep-cycle capacity or both.
The 12V 172Ah dual-purpose battery is one of Epoch’s most compelling bass boat options.
It combines compatible outboard-starting capability and substantial deep-cycle capacity in a compact Group 31 case.
It is well suited to anglers who want to:
The battery is approximately 12.91 inches long, 6.22 inches wide and 8.46 inches high.
That familiar Group 31 format makes it easier to retrofit into many existing marine trays, but tray dimensions, lid clearance, terminal access and hold-down hardware must still be checked.
This model is not approved for series wiring. Do not use multiple 12V 172Ah batteries to build a 24V or 36V trolling bank unless Epoch provides written model-specific approval.
The 300Ah Pro Series is designed for the most demanding bass boat and marine electrical systems.
It combines cranking capability with 3.84kWh of deep-cycle energy.
That capacity can support:
The 300Ah Pro Series is physically larger than a Group 31 battery. It uses a Group 8D-style footprint measuring approximately 19.70 inches long, 10.5 inches wide and 9.75 inches high.
Choose it when maximum capacity, high current, heating, IP67 protection, Victron communication and UL-certified pack construction are worth dedicating additional compartment space.
A separate Epoch 12V house battery can isolate sonar and accessories from engine-starting events.
This can be valuable when a boat uses:
A dedicated electronics battery reduces the risk that a starter-voltage event will cause displays to dim, reboot or lose network connections.
The battery does not replace good wiring. Electronics should still use correctly sized marine cable, appropriate fusing and a quality distribution system.
A 24V trolling motor traditionally uses two 12V batteries wired in series.
Epoch allows the angler to replace that multi-battery bank with one native 24V LiFePO4 battery.
The 24V 60Ah Pro Series stores approximately 1.54kWh in a compact Group 27 footprint.
Its dimensions are approximately:
Available features include:
This is a strong option for anglers who prioritize:
The 24V 100Ah battery stores approximately 2.56kWh and provides twice the nominal capacity of a 50Ah-class system.
It provides:
The case measures approximately 13 inches long, 10.25 inches wide and 11 inches high and weighs approximately 48.5 pounds.
Choose the 100Ah model when longer runtime and additional tournament reserve matter more than selecting the smallest possible battery.
One native 24V Epoch battery can eliminate:
It also provides one Bluetooth state-of-charge reading for the entire 24V trolling system.
A 36V trolling motor is common on tournament bass boats, larger hulls and boats that must maintain control in strong wind and current.
Epoch offers two native-voltage 36V options.
The 36V 50Ah Essential Series stores approximately 1.92kWh in a Group 31 footprint.
It provides:
Its dimensions are approximately 13 inches long, 6.8 inches wide and 9.44 inches high.
That familiar Group 31 footprint is one of its biggest advantages.
A single battery can replace three compatible 12V lead-acid trolling batteries while fitting into a tray format already common in bass boats.
The 36V 100Ah battery stores approximately 3.84kWh—twice the energy of the 36V 50Ah model.
It provides:
Its dimensions are approximately 20 inches long, 10.25 inches wide and 11 inches high.
Choose the 100Ah model when:
Matched 36V 50Ah batteries can be connected in parallel to increase capacity while preserving the Group 31 footprint.
Possible configurations include:
This approach can be attractive when a boat has several existing Group 31 tray positions or when the installer wants to distribute weight rather than place one large battery in a single compartment.
It can also provide a degree of battery-level redundancy. If one battery is intentionally isolated, the remaining batteries may continue operating when their available current and capacity are sufficient.
That is not a guarantee against every failure. Shared breakers, busbars, plugs, cables and trolling-motor connections can still be single points of failure.
Use matched batteries, balanced wiring, suitable busbars, individual protection where required and a charging system sized for the complete bank.
Capacity should be selected from measured or estimated energy use, not from a universal “all-day” promise.
A useful starting formula is:
Estimated runtime in hours = usable amp-hours ÷ average trolling-motor current
For conservative planning, maintain approximately 10% reserve:
Planning runtime = battery amp-hours × 0.90 ÷ average current
Average current is not the same as maximum current.
During a real fishing day, the trolling motor may spend time:
A motor running continuously near maximum thrust will use energy much faster.
With a 10% reserve:
With a 10% reserve:
These are mathematical estimates, not guaranteed product runtimes.
Actual results depend on:
For a tournament boat, it is usually better to return with reserve than to size the bank around perfect weather.
An outboard may spend a significant portion of the day moving the boat between fishing areas.
Epoch charge-on-the-run DC-to-DC chargers can turn some of that engine-run time into regulated charging for separate auxiliary batteries.
The single-output charge-on-the-run charger accepts a compatible 12V or 24V starter-battery system and provides a regulated 36V/10A output for a compatible 36V trolling-motor battery.
This allows the boat to replenish part of the trolling energy while the outboard is running.
The charger provides:
This charger supplements the energy used during the day. It does not replace a complete dockside recharge.
A short outboard run may recover only part of the energy consumed during several hours of trolling.
The dual-output model provides:
It is designed for boats that use:
The 12V output should charge a separate auxiliary battery. It should not be connected back to the same starter battery used as the charger input.
This configuration can replenish both the electronics bank and trolling bank while the outboard charging system is active.
A DC-to-DC charger controls the auxiliary outputs, but universal alternator compatibility should not be assumed.
Before installing charge-on-the-run equipment, confirm:
The dual-output charger can represent substantial input demand, especially when powered from a 12V source.
Use a qualified marine installer when alternator capacity or grounding requirements are uncertain.
After a long tournament day, the charging process should be simple.
A permanently mounted onboard charger allows the angler to park the boat, connect one AC cord and begin charging the appropriate battery banks without carrying multiple portable chargers.
Epoch offers different one-plug charging solutions for different battery layouts.
The Epoch 12V and 36V onboard marine charger is designed for a mixed-voltage bass boat system.
It provides:
This is a highly persuasive pairing for a modern bass boat using:
Plug the boat in once and both voltage systems receive independent charging from one onboard unit.
The batteries are not electrically combined. Each bank receives its own voltage, current and charging logic.
Some anglers prefer to retain a traditional series arrangement using three individual 12V batteries for a 36V trolling motor.
The Epoch four-bank onboard marine charger provides four independent 12V/10A outputs.
That allows one charger bank to connect to each battery:
The charger provides up to 40A of total nominal output when all four banks are charging at full rating.
Each bank has its own chemistry selection, status display and lithium BMS activation.
One AC plug charges all four batteries.
Always confirm that the charger and battery manuals approve the intended series-bank charging arrangement and whether the series interconnects may remain connected during charging.
A native 24V Epoch trolling battery should be charged with a compatible 24V LiFePO4 charger.
Epoch offers a dedicated 24V 15A charger for its compatible 24V batteries.
A separate 12V cranking or electronics battery requires its own appropriate 12V charging source.
Epoch’s current mixed-voltage one-plug onboard charger is specifically designed for 12V and 36V systems, not a native 12V and 24V combination.
A qualified installer may integrate separate 12V and 24V chargers behind one properly protected shore-power inlet, but every charger must remain electrically matched to its own battery bank.
A permanently mounted one-plug charging system can provide:
The best charger is the one that matches the exact voltage, chemistry, capacity and bank layout of the boat.
