The Epoch B36100A-A is a 36V 100Ah LiFePO4 lithium marine battery purpose-built for serious anglers running high-thrust 36-volt trolling motors. With 3.84 kWh of stored energy, a built-in self-heating system, IP67 waterproof construction, and real-time Bluetooth monitoring, this is a complete power upgrade over traditional lead-acid and AGM battery setups.
This battery replaces three separate 12V deep-cycle batteries wired in series. One connection, one battery, one charger. Customers report arriving home after full days of spot-locking in heavy saltwater current with 65 to 85 percent charge remaining. Multiple reviewers have fished two to four consecutive days without charging.
Built for 36-Volt Trolling Motors
Compatible with 36-volt trolling motors including Minn Kota Terrova, Minn Kota Ulterra, Minn Kota Riptide, Garmin Force, Garmin Force Kraken, and MotorGuide Xi5. The battery delivers 120A of continuous discharge and handles 200A peak surges for 60 seconds, providing the steady voltage your motor demands from startup through a full day on the water.
Unlike AGM batteries that lose thrust as voltage drops, LiFePO4 chemistry maintains a flat, consistent voltage curve until the battery is nearly depleted. Your trolling motor performs the same at 90 percent charge as it does at 20 percent charge.
Self-Heating System for Cold-Weather Charging
Standard LiFePO4 batteries cannot be safely charged below 32°F (0°C). The Epoch B36100A includes a built-in self-heating element that automatically activates when temperatures drop, allowing safe charging down to -4°F (-20°C). This is critical for anglers who fish year-round or store their boat in cold climates. Competing batteries either lack this feature entirely or require a manual activation step.
IP67 Waterproof Sealed for Marine Use
The enclosure carries an IP67 rating, meaning it is fully protected against dust and against water submersion up to one meter for 30 minutes. The case is constructed from an ABS and polycarbonate blend with a UL94-V0 flame rating. Salt spray, rain, and wave wash do not affect performance. Multiple customers have run this battery through rough offshore conditions without issue.
Bluetooth App Monitoring iOS and Android
The Epoch Batteries app (available on the App Store and Google Play) connects via Bluetooth and displays real-time voltage, state of charge, individual cell voltages, amp draw, and estimated runtime. Customers use this information to make decisions on the water adjusting speed, managing load, and knowing exactly how much power they have left without guesswork.
One reviewer mounted the optional wired analog gauge to their center console for a quick visual reference while fishing, in addition to the phone app.
One Battery Replaces Three
Three Group 27 or Group 31 lead-acid batteries wired in series to produce 36V typically weigh between 150 and 195 pounds combined and require a 3-bank charger. The Epoch B36100A weighs 75 pounds and charges with a single 36V LiFePO4-compatible charger. Customers report weight savings of 75 to 100 pounds, measurable improvements in boat speed, and significantly cleaner battery wiring.
Up to four batteries can be connected in parallel for up to 400Ah of capacity, using the same 36V system.
11-Year Manufacturer Warranty
Epoch Batteries warrants this battery against manufacturer defects for 11 years from the date of purchase. Rated for 3,500 or more charge cycles. No maintenance required no water checks, no acid, no corrosion. For full details read Warranty Tab.
Engineered in the USA
Epoch Batteries designs and engineers its products in the United States. The company is a member of NMEA, ABYC, NMMA, RVDA, and GCSAA. The B36100A cells carry UL 1642, UL 9540A, IEC 62619:2022, CE, and RoHS certifications. Shipping classification is UN 38.3 Class 9.
Features
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36V 100Ah LiFePO4 Chemistry Prismatic Cells: High-quality prismatic lithium iron phosphate cells in a 12S configuration. Delivers 3.84 kWh of usable energy. Stable chemistry with no thermal runaway risk. 100 percent of rated capacity is usable unlike lead-acid batteries limited to 50 percent safe depth of discharge.
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Self-Heating System Charges Down to -4°F (-20°C): Built-in automatic heating element protects cells from cold-weather charge damage. Activates without manual intervention. Compatible with year-round fishing in cold climates. Most competing 36V lithium batteries do not include this feature.
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IP67 Waterproof and Dustproof Enclosure: Sealed ABS and polycarbonate case with UL94-V0 flame rating. Fully protected against dust ingress and water submersion. Built for marine environments saltwater spray, rain, and wave wash do not affect the battery.
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Bluetooth Connectivity iOS and Android App: Real-time monitoring of state of charge, voltage, individual cell voltages, amp draw, temperature, and estimated runtime. Free Epoch Batteries app available on App Store and Google Play. Includes quick links to product manuals within the app.
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120A Continuous Discharge / 200A Peak: Handles the full power demands of high-thrust trolling motors including 112-pound thrust models. 200A peak discharge sustained for 60 seconds handles startup surges without triggering the BMS.
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Built-In Smart BMS Full Protection Suite: The onboard Battery Management System provides overcharge protection, over-discharge protection, overcurrent protection, short-circuit protection, high-temperature cutoff, low-temperature cutoff, and automatic cell balancing.
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Parallel Connection Up to 4 Units (400Ah): Connect up to four B36100A batteries in parallel for increased capacity. Plug-and-play parallel connection no additional hardware required. Maximum one unit in series.
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Molded Anchor Mounts No Tray Required: Integrated mounting feet are molded directly into the base of the case. Bolt directly to the battery compartment floor. Dimensions: 20" L x 10.25" W x 11" H. Does not conform to a standard BCI group size.
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M8 Female Terminals: Heavy-duty M8 female terminal posts. Compatible with standard marine wiring.
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Maintenance-Free Operation: No water checks, no acid monitoring, no corrosion cleaning. Rated for 3,500 or more charge-discharge cycles. 11-year manufacturer warranty.
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Fast Charging: Accepts up to 100A continuous charge current. Compatible with Epoch 36V 15A dedicated charger charges from near-empty to full in approximately 2.5 hours. Can also charge underway via compatible DC-to-DC charger or alternator-based charging system programmed for LiFePO4 specifications.
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UL, CE, and RoHS Certified Cells: UL 1642, UL 9540A, IEC 62619:2022, CE, RoHS. Shipping classification UN 38.3 Class 9. Engineered in the USA.
Tech Specs
Electrical Specifications
| Specification |
Value |
| Model |
B36100A-A
|
| Nominal Voltage |
38.4V |
| Nominal Capacity |
100Ah |
| Energy Stored |
3.84 kWh |
| Cell Configuration |
12S (LiFePO4 Prismatic) |
| Max Charge Voltage |
43.8V |
| Operating Voltage Range |
30V – 43.8V |
| Series Connections |
Max 1 in Series |
| Parallel Connections |
Max 4 in Parallel (Plug and Play) |
| Bluetooth |
Yes iOS and Android |
| Self-Heating |
Yes Automatic |
| Low-Temperature Charge Protection |
Yes |
Discharge Specifications
| Specification |
Value |
| Max Continuous Discharge |
120A |
| Max Peak Discharge (60 seconds) |
200A |
| Discharge Temperature Range |
-20°C (-4°F) to 60°C (140°F) |
Charge Specifications
| Specification |
Value |
| Max Continuous Charge |
100A |
| Max Charge (10 seconds) |
150A |
| Bulk / Absorption Voltage |
42.6V – 43.2V |
| Float Voltage |
Disabled (preferred) or 40.0V – 40.8V |
| Equalization |
Disabled |
| Temperature Compensation |
0 mV/°C - Disabled |
| Re-Bulk Voltage |
39.6V |
| BMS High Voltage Cutoff |
43.8V |
| Battery Charge Temperature Range |
0°C (32°F) to 55°C (131°F) |
| Cell Charge Temperature Range |
0°C (32°F) to 55°C (131°F) |
| Reconnect Temperature |
50°C (122°F) |
| SoC Recalibration |
43.8V |
Temperature Specifications
| Specification |
Value |
| Discharge Temperature |
-20°C (-4°F) to 60°C (140°F) |
| Charge Temperature (with heating) |
-20°C (-4°F) to 55°C (131°F) |
| Recommended Storage Temperature |
0°C (32°F) to 35°C (95°F) |
Mechanical Specifications
| Specification |
Value |
| Dimensions (L x W x H) |
20" x 10.25" x 11" |
| Weight |
75 lbs |
| Terminal Type |
M8 Female |
| Case Material |
ABS and PC Blend UL94-V0 Flame Rated |
| Enclosure Protection |
IP67 Dustproof and Waterproof |
| Cell Type |
Prismatic LiFePO4 |
Compliance and Certifications
| Specification |
Value |
| Cell Certifications |
UL 1642, UL 9540A, IEC 62619:2022, CE, RoHS |
| Shipping Classification |
UN 38.3, Class 9 |
| Warranty |
11 Years Manufacturer Warranty |
| Engineered |
In the USA |
Charger Programming Requirements
To properly charge this battery, verify that your charger can be programmed to the following settings. This applies to all charging components including onboard chargers, solar charge controllers, DC-to-DC chargers, and inverter-chargers.
| Setting |
Required Value |
| Bulk / Absorption Voltage |
42.6V – 43.2V |
| Float Voltage |
Disabled (preferred) or 40.0V – 40.8V |
| Equalization |
Disabled |
| Temperature Compensation |
0 mV/°C Disabled |
| Charge Rate |
50% of battery or battery bank capacity |
| Battery Charge Temperature Range |
32°F (0°C) to 131°F (55°C) |
Not all chargers support multi-stage LiFePO4 programming. If your charger does not, confirm it can be set to the Bulk/Absorption voltage above and that float and equalization can be disabled. Consult your charger manual or contact the manufacturer before use. The Epoch 36V 15A dedicated charger is pre-programmed for this battery.
