A bass boat's starting battery has to turn over the outboard after hours of sonar, pumps and other 12V loads. That is a different job from powering a trolling motor all afternoon. A tired lead-acid battery can take up valuable stern space, add weight and leave less useful reserve than its label suggests. Epoch's cranking-rated LiFePO4 batteries combine a short, high-current starting pulse with deep-cycle capacity for compatible electronics.
The Epoch Lithium Starting Batteries for Bass Boats collection includes two 12V dual-purpose choices: a 172Ah Essential in a Group 31 footprint and a 300Ah Pro in a Group 8D footprint. Both include Bluetooth monitoring and an 11-year limited warranty (3 years free replacement, then 40% off MSRP on a replacement battery through Year 11). The Pro adds heating, Victron communication and a higher enclosure rating. Choose by the outboard's requirements, the boat's electrical layout and the starting reserve you need at the end of the day.
More power for the space is most useful when it means adequate starting output plus more practical energy for the loads you actually run. It does not make a 12V starter into a 24V or 36V trolling-motor pack. Keep the trolling circuit on a properly matched trolling battery bank, and decide whether forward-facing sonar or other electronics should have a separate house circuit.
These are the cranking-capable models in this collection. Other Epoch deep-cycle batteries may offer large amp-hour numbers, but they are not automatically suitable for starting an outboard. Case size, operating current, cold-weather behavior and monitoring features separate these two options.
| Battery | Energy and fit | Starting and marine features |
|---|---|---|
| 12V 172Ah Essential dual-purpose | 2.20kWh; 40 lb; Group 31; IP65. | 1,000A for 5 seconds; 200A continuous; Bluetooth via Epoch Li-Ion app; no internal heating. |
| 12V 300Ah Pro dual-purpose | 3.84kWh; 81 lb; Group 8D; IP67. | 1,000A for 5 seconds or 800A for 10 seconds; 300A continuous; Bluetooth via Epoch Pro app, heating and Victron communication. |
The Group 31 case can suit a tighter starting-battery tray, while the larger Group 8D Pro offers more stored energy for a heavier daily electronics load. The Essential's IP65 enclosure resists spray but is not submersible; the Pro's IP67 case has stronger ingress protection. Neither rating protects exposed connections from corrosion, loose wiring or standing water around the installation.
Before a morning launch, the starting battery should be fully charged and ready for the outboard's short surge demand. After running to the first spot, the motor may remain off while multiple displays, livewell pumps, a stereo and a shallow-water anchor draw on the 12V system. A dual-purpose Epoch battery can support an approved combination of those loads and the next start. The Bluetooth reading helps show how much charge remains before making another run.
The most important calculation happens before the trip: estimate electronics and pump consumption for the longest expected fishing session, then retain a healthy starting reserve. A larger amp-hour battery can offer more flexibility, but heavy electronics use can still leave too little margin. If the engine maker requires a dedicated starting battery or the boat has power-hungry graphs, separate the house electronics with an appropriate charging and isolation design.
A Group 31 replacement can reduce bulk in a crowded rear hatch when the engine and loads match the 172Ah model. Its 40-pound case is easier to plan around than many multi-battery lead-acid arrangements, but measure the actual tray, tie-downs, height and terminal clearance. This model has low-temperature charge protection and no built-in heater, so check its charging limits for cold-weather launches.
The 300Ah Pro fits a Group 8D-class space and adds internal heating for compatible charging in freezing conditions when charging power is available. It can support more 12V house energy and communicates with suitable Victron equipment in a properly configured system. The larger case is not the right answer when the hatch, hold-down or cable layout cannot support it. Compare installed dimensions and current ratings, not just capacity.
Both batteries expose available state-of-charge, voltage, current and temperature data through their respective Epoch-compatible apps when a phone is nearby. Check the starting battery before leaving the ramp, after long periods with the outboard off and before the last run home. Bluetooth makes reserve more visible than a voltage-only guess, but it is local monitoring; it does not by itself send a remote alert or replace a prelaunch system check.
The built-in battery management system helps protect against overcurrent, short circuits, over-discharge and unsuitable temperatures. This contributes to dependable operation when the battery is correctly sized, but a protective cutoff can also interrupt connected electronics or starting if a limit is reached. Use appropriately rated fusing, secure terminals and a reserve strategy for essential equipment. The Pro's internal heating addresses cold charging; the Essential requires particular attention to its unheated charging limits.
LiFePO4's steadier discharge voltage can help compatible electronics run more consistently across a long day. Epoch lists 4,000+ charge cycles for the 172Ah Essential and 6,000+ for the 300Ah Pro under the specified test conditions. Actual life depends on charging, temperature and use. Routine boat inspection remains important even without flooded lead-acid maintenance.
Do not substitute the 172Ah Essential into a 24V or 36V series trolling bank; Epoch does not approve series wiring for that model. Keep lead-acid and lithium out of the same directly connected bank. If the outboard's requirements or charging path are unclear, have a qualified marine installer check the plan before replacing the starting battery.
Epoch's two dual-purpose bass boat batteries offer a way to combine approved cranking power with more routinely usable 12V energy than many lead-acid setups, while reducing routine upkeep and adding Bluetooth visibility. The Group 31 Essential prioritizes a compact fit; the Group 8D Pro adds capacity, heating and communication for a larger installation. The best solution is the model that meets the outboard's requirements and still leaves a reliable route back to the ramp.
Explore Lithium Starting Batteries for Bass Boats, or contact Epoch support with your outboard model, battery-tray measurements, charger and daily electronics load.
Start here
Three starting points from this collection's live listing: the lowest price, a mid-range price and the most stored energy. Check voltage, fit and charging before you order. Every model is compared in full below.
Lowest price
12V · 172Ah · 2.2kWh
€813.95In stock
12V 172Ah, 2.2kWh nominal, with Bluetooth: the most affordable way into this collection.
Most stored energy
12V · 300Ah · 3.84kWh
€1,446.95In stock
12V 300Ah, 3.84kWh nominal, with Bluetooth and internal heating: the largest capacity in this collection.
Full comparison and every model below.
2 products
Our core line of LiFePO4 batteries for marine, RV, golf cart and off-grid power.
Uses: Marine engine starting (outboards up to 250hp when requirements match)
Dual-purpose batteries that start the engine and run the house loads.
Uses: Marine engine starting · Dual-purpose boat systems
Side-by-side specs
Every battery in this collection uses LiFePO4 chemistry with a built-in battery management system (BMS). Compare stored energy, price, continuous and peak output, weight, size, cycle life, warranty and features side by side.
2 models
| Model | Series / Parallel | Features | |||||||
|---|---|---|---|---|---|---|---|---|---|
Essential Series1 model | |||||||||
2.20 kWh172Ah | 200APeak 1,000A (up to 5 s, cranking only) | 40 lb | Group 3112.9 × 6.2 × 8.5 in | 4,000+ | 11 yr3 yr free | Parallel onlyup to 4 |
| ||
Pro Series1 model | |||||||||
3.84 kWh300Ah | 300APeak 1,000A (up to 5 s) | 81 lb | Group 8D19.7 × 10.5 × 9.8 in | 6,000+ | 11 yr3 yr free | Series: up to 4Parallel: up to 16 |
| ||
Cycle life is rated per model, at the depth of discharge, charge rate and temperature stated on the datasheet, to its end-of-life capacity.
Product reviews
Recent reviews of the models on this page, collected by Okendo from customers after their purchase and shown newest first. Each review names the battery it is about; store-wide ratings are not mixed in.
Most Reliable Batteries I've Ever Ran!
I've been running EPOCH batteries since early 2023 on my bass boat and my 5th wheel RV. I've ran multiple different styles of their 12V batteries, and I've never had any issues with them. As technology advances and they're able to create more amp hours; I continue to remain amazed with the uninterrupted performance I receive under harsh conditions all season.
Very nice looking battery
I installed this in a 2007 Winnebago View, upgraded all the appropriate wiring added a Victron DC to DC charger a Victron MPPT controller for the solar panels and a house 2start chassis battery trickle charger. The new Epoch battery replaces two AGM‘s in the space of just a little more than one AGM battery. Everything seems to be working well have not taken it on a glamping trip yet.. so far the review is good. I won’t really know for a few months.