Essential Series
36V 50Ah Essential Series LiFePO4 Battery (1.92kWh)
$749
IP65BluetoothHeated
- 11-year warranty
- US-based support
- Available to ship today
Compatible charger
Recommended
Features at a glance
- IP65Weatherproof
Dust-tight and protected against water jets from any direction. Not submersible.
- 4,000+Cycle life
Over 10 years at one full cycle a day. Rated at the depth of discharge, charge rate and temperature stated on the datasheet, to its end-of-life capacity.
- iOS + AndroidBluetooth app
Charge, voltage and temperature on your phone in the Epoch Li-Ion app.
- Advanced BMSProtection
Guards against overcharge, over-discharge, overcurrent and short circuit.
- Self-heatingCold weather
Warms its cells before charging, so it can charge in freezing weather.
- LiFePO4Thermal stability
Lithium iron phosphate has a far lower thermal-runaway risk than other lithium chemistries. The BMS adds over-temperature and low-temperature charge protection.
- 36V 50Ah Essential Series LiFePO4 (1.92kWh): A 38.4V nominal, 50Ah heated Bluetooth deep-cycle battery with 1.92kWh (1,920Wh) of nominal stored energy in a BCI Group 31 case, for 36V trolling motors and other 36V deep-cycle systems. It suits many Group 31 installations but is not a drop-in for every lead-acid or AGM one: check tray fitment, terminal clearance, cable size, overcurrent protection and charger profile first.
- Replaces a Three-Battery 12V Bank: One 38.4V battery can replace a three-battery 12V lead-acid trolling-motor bank, in a 35 lb (15.9kg) case measuring 13.0 × 6.8 × 9.44 in.
- High-Performance Output: 100A maximum continuous discharge and a 130A peak for up to 10 seconds (25A recommended discharge). Size loads, conductors and overcurrent protection to the 100A continuous rating. Deep-cycle only: not cranking-rated, so not for engine starting.
- 50A Charging: 50A maximum continuous charge current (25A recommended) and a 43.8V maximum charge voltage. Use a LiFePO4 charge profile, such as the Epoch 36V 15A LiFePO4 charger; for alternator charging, a DC-to-DC charger is highly recommended.
- Heated for Cold-Weather Charging: Rated to charge from -20°C to 55°C (-4°F to 131°F) with internal heating. At 0°C the BMS pauses charging and incoming charge current from a connected charger (at least 0.5A) powers the heating pads, never stored battery energy; charging resumes automatically at 5°C (41°F).
- Smart Bluetooth Monitoring: The free Epoch Li-Ion app (iOS and Android) shows state of charge, voltage, current, temperature and battery status, measured by a BMS-integrated shunt (0.2A accuracy on discharge), so no external shunt is needed.
- Advanced BMS Protection: Protects against overcharge, over-discharge, over-current, short circuit, and high and low temperature. It does not replace an external fuse or DC-rated breaker for the wiring.
- IP65 Rated: Dust-tight and protected against water jets, for many trolling-motor, fishing-boat and outdoor marine installations. Not submersible: do not submerge or pressure-wash it, or mount it where water can pool.
- Parallel Expansion: Up to 4 matched 3650A-H batteries in parallel (200Ah, 7.68kWh) for longer runtime. Do not connect in series.
- 4,000+ Cycle Life & Low Maintenance: No watering, acid service or routine lead-acid maintenance; periodic inspection keeps it safe.
- 11-Year Limited Manufacturer Warranty: Register within 90 days of purchase for full warranty coverage.
Configuration
Cell Configuration: 12S
Chemistry: LiFePO4
Current
Ah Capacity: 50Ah
Max Continuous Discharge Amps: 100A (25A recommended)
Max Charge Current Amps: 50A (25A recommended); 120A peak for up to 10 Seconds
Max Discharge Peak Current Amps: 130A (up to 10 Seconds)
Series | Parallel: Parallel only: Max (4) in Parallel (200Ah); do not connect in series
Voltage
Voltage: 38.4V
Max Charge Voltage: 43.8V
Operating Voltage Range: 30.0 - 43.8V
Temperature
Charge Temp Range: -20°C (-4°F) / 55°C (131°F) (with heating)
Discharge Temp Range: -20°C (-4°F) / 60°C (140°F)
Storage Temp: 0°C (32°F) / 35°C (95°F) (recommended; max 12 Months)
Weight: 35 (LBS)
Dimensions
Length: 13.0 (inches)
Width: 6.8 (inches)
Height: 9.44 (inches)
BCI Group 31 footprint. Verify tray dimensions, terminals, wiring and charging-system compatibility before installation.
Cell-level certifications: UL 1642, IEC 62619:2022
Compliance marks: CE, RoHS
Transport: UN 38.3, Class 9
UL 1642 and IEC 62619 apply to the cells used in this battery, not to the complete battery assembly.
Maximum Continuous Charge Current: 50A per battery, all charging sources combined
Recommended Charge Current: 25A (0.5C)
Peak Charge Current: 120A for up to 10 seconds
Bulk/Absorption: 42.6V-43.2V
Absorption End Condition: Charge current ≤ C/20 (2.5A) or 15 min, whichever comes first
Float Voltage: Disabled (preferred) or 40.0V-40.8V
Re-bulk: 39.6V
Temperature Compensation: 0 mV/°C (off)
Equalization: Disabled; do not use lead-acid equalization, desulfation or repair modes
Charge Temperature Range: -20°C to 55°C (-4°F to 131°F) with internal heating; at 0°C (32°F) charging pauses while incoming charge current (at least 0.5A) warms the battery, and charging resumes at 5°C (41°F)
Charger Temperature Limit Setting: 0°C to 55°C (32°F to 131°F), unless the charger has approved cold-charge logic
BMS High Voltage Cutoff: 43.8V
SoC Recalibration: 43.8V
Alternators: use a DC-to-DC charger programmed for LiFePO4 (highly recommended)
NOTE: Select a LiFePO4 profile or program the settings above; do not use lead-acid, AGM or gel profiles. Confirm the ratings on your battery label before raising a charger's current limit; earlier production may carry different ratings.
Bluetooth Security PIN
This battery includes a security PIN for the Epoch Li-Ion app, which asks for it the first time you connect via Bluetooth. The original PIN is printed on the battery's lid. You can change it in the app under Advanced Settings; the lid sticker still shows the original PIN, so keep a secure record of any new one.
- •Prevents unauthorized Bluetooth connections
- •Protects battery configuration and system parameters
- •Ensures only authorized users can monitor or interact with the battery
Epoch Li-Ion App
Still have questions?
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Downloadable resources
Applications & use cases
- 36V trolling motors
- Bass and fishing boats
- Pontoons and skiffs
- Aluminum boats
- Replacing a three-battery 12V trolling motor bank
- Marine electronics and 36V auxiliary loads
- Marine house power (36V systems)
- RV house power (36V systems)
- Van and camper systems
- Off-grid solar systems
- Solar battery banks and inverter systems
- Backup power and standby systems
36V trolling motor battery
Epoch 36V 50Ah Group 31 Marine Trolling Motor Battery
A lightweight 36V 50Ah lithium battery for anglers upgrading from heavy lead-acid trolling motor banks.
The Epoch 36V 50Ah Group 31 Marine Trolling Motor Battery is a compact 36V trolling motor battery, 36V 50Ah lithium battery, and Group 31 marine battery upgrade for anglers who want one lightweight 36V deep cycle lithium power source instead of three heavy 12V lead-acid batteries. Built with LiFePO4 chemistry, internal heating for cold-weather charging, Bluetooth battery monitoring, advanced BMS protection, and an IP65 weatherproof enclosure, it stores 1.92kWh of energy (nominal, at 38.4V) for compatible 36V trolling motor systems.
36V
System voltage
50Ah
Capacity
1.92kWh
Stored energy
100A
Continuous output
IP65
Weatherproof
35 lb
Approx. weight
Built to go further
11-year limited warranty
Manufacturer coverage
U.S.-based support
Help when you need it
Veteran owned
Mission-focused brand
Designed and engineered
U.S. product design
Advanced BMS
Built-in protection
LiFePO4 safety
Stable lithium chemistry
One Lightweight Battery for a Three-Battery Bank
Replace three heavy 12V lead-acid batteries with one compact 36V deep cycle lithium battery.
This Epoch 36V 50Ah lithium battery simplifies a traditional 36V trolling motor setup: one 38.4V LiFePO4 battery can replace a three-battery 12V lead-acid trolling-motor bank, with no watering or acid service. At approximately 35 lbs, it removes significant weight from the bow or battery compartment while freeing up valuable boat storage space.
The Group 31 marine footprint gives anglers a familiar fitment path: 13.0 in L × 6.8 in W × 9.44 in H. It suits many Group 31 installations, but it is not a drop-in replacement for every lead-acid or AGM installation: always verify tray dimensions, hold-down straps, cable clearance, terminal orientation, cable size, overcurrent protection, and charger compatibility before replacing your current boat battery bank.
Power Your 36V Trolling Motor
Efficient 36V marine lithium performance for fishing boats and trolling motor systems.
With 1.92kWh of stored energy, 100A continuous discharge capability, and a flat LiFePO4 discharge curve, this 36V trolling motor battery helps maintain strong voltage and consistent thrust through most of the battery’s usable capacity. That means less voltage sag compared with traditional lead-acid banks and more predictable power on the water.
This battery is designed for compatible 36V trolling motor platforms, including systems commonly used with Minn Kota, Garmin, and Lowrance trolling motors when voltage, current draw, charger profile, and manufacturer battery requirements match. For longer fishing days or heavier current and wind, add runtime by wiring up to four matched 3650A-H batteries in parallel (up to 200Ah); this model must not be connected in series.
IP65 weatherproof and rugged marine construction
Dust-tight. Water-jet resistant. Built for demanding boat environments.
The sealed IP65 enclosure helps protect the battery from dust, rain, spray, and low-pressure water jets, giving anglers dependable protection for wet decks, splashes, and outdoor use. Shoppers comparing IP67 waterproof marine battery options should note that this model is IP65 rated, not submersible; install it where standing water cannot collect around the battery, terminals, or wiring.
Built-in heating and smart Bluetooth monitoring
Know your state of charge before the next cast.
Internal heating supports cold-weather charging: at 0°C (32°F) the BMS pauses charging and the incoming charge current from a connected charger (at least 0.5A) warms the battery, never its stored energy, then charging resumes at 5°C (41°F). The Bluetooth battery monitor lets you check state of charge, voltage, current, temperature, and battery status in the free Epoch Li-Ion app for iOS and Android, measured by a shunt built into the BMS. It is especially useful for anglers who want real-time battery confidence without guessing how much runtime remains.
Compatible applications
Marine trolling motors, fishing boats, and compatible 36V power systems.
- ✓ 36V trolling motor systems where voltage and current requirements match.
- ✓ Bass boats, fishing boats, pontoons, skiffs, aluminum boats, and compatible marine deep-cycle setups.
- ✓ Marine trolling systems from brands such as Minn Kota, Garmin, and Lowrance when manufacturer requirements are compatible.
- ✓ Replacement for three 12V lead-acid trolling motor batteries in compatible 36V banks.
- ✓ Group 31 marine battery tray installations where the 13.0 in × 6.8 in × 9.44 in case fits.
- ✓ Boat electronics and 36V auxiliary loads when system wiring, fusing, and current ratings are properly matched.
- ✓ Solar, off-grid, and backup energy systems built around compatible 36V charging and inverter equipment.
- ✓ Parallel battery banks up to four batteries for increased amp-hour capacity and longer runtime.
- ✓ Cold-weather fishing setups where internal heating and low-temperature charge protection are important.
Battery features
Smart marine lithium performance with cold-weather charging support.
36V trolling motor batterySingle-battery 36V platform for compatible marine trolling motor systems.
36V 50Ah lithium batteryStores 1.92kWh (1,920Wh, nominal) at 38.4V with LiFePO4 chemistry.
Group 31 marine footprintMeasures 13.0 in L × 6.8 in W × 9.44 in H for many Group 31 tray installations.
Native 36VOne 38.4V battery can replace a three-battery 12V lead-acid trolling-motor bank in compatible 36V systems.
100A continuous dischargeSupports demanding 36V loads while maintaining efficient lithium output.
130A peak dischargeDelivers short-duration peak output for up to 10 seconds.
50A continuous chargeUp to 50A continuous charge current, 25A recommended, with a LiFePO4 charge profile.
Internal heatingBelow 0°C, charge current from a connected charger powers heating pads that warm the battery to 5°C before charging resumes.
Bluetooth battery monitorThe free Epoch Li-Ion app for iOS and Android shows state of charge, voltage, current, and temperature from a shunt built into the BMS.
Advanced BMS protectionHelps protect against overcharge, over-discharge, over-current, short circuit, and temperature extremes.
IP65 weatherproof protectionDust-tight and protected against water jets for boats and outdoor use. Not submersible.
4,000+ cycle lifeLong-lasting lithium performance compared with traditional lead-acid batteries.
Parallel expansionUp to four batteries in parallel (200Ah, 7.68kWh) for added 36V runtime. Do not connect in series.
Lightweight 36V batteryAt approximately 35 lbs, it removes significant weight from a traditional lead-acid bank.
Maintenance-free designNo watering, acid service, or routine lead-acid maintenance; periodic inspection keeps it safe.
11-year limited warrantyBacked by Epoch’s limited manufacturer warranty; register within 90 days of purchase for full coverage.
Compatible chargers and accessories
Recommended add-ons for a complete 36V marine installation.
✓
Epoch 36V 15A LiFePO4 battery charger.
✓
Epoch battery tray for 3650A-H.
✓
Lithium-compatible 36V onboard marine charger.
✓
Properly sized marine-grade cable, fusing, disconnects, and terminal hardware.
Specifications
Full technical details, dimensions, weight, current ratings, and 36V charging settings.
IP65 marine weather protection
Dust-tight and protected against water jets for demanding outdoor use. Not submersible.
The IP65-rated enclosure is designed for dust-tight protection and resistance to low-pressure water jets, making it suitable for many trolling motor, fishing boat, and outdoor marine installations. It should not be submerged, pressure washed, or mounted where water can pool around the battery or terminals.
Why upgrade to Epoch LiFePO4?
More usable energy. Less weight. Longer service life.
LiFePO4 technology provides stable voltage output, long cycle life, fast charging capability, and maintenance-free operation. Compared with traditional lead-acid trolling motor batteries, this Epoch lithium battery delivers efficient 36V energy storage in a lighter package while eliminating watering, acid maintenance, and routine lead-acid service.
Fitment and charging note
Verify your trolling motor, charger, and battery tray before installation.
Always confirm Group 31 tray fitment, cable clearance, terminal compatibility, trolling motor current requirements, charger compatibility, and system requirements before installation. Use a 36V LiFePO4-compatible marine charger, inverter charger, solar charge controller, or DC-to-DC charger programmed within Epoch’s recommended charging parameters. Tighten the M8 terminal hardware to 8–12 N·m (71–106 in-lb), and place the main fuse or DC-rated breaker as close as practical to the battery positive terminal. Do not wire this battery in series. For parallel battery banks of up to four, use matched 3650A-H batteries of similar age, condition, and firmware, all at the same state of charge, and follow Epoch’s installation guidelines.
Frequently asked questions
36V 50Ah Group 31 Battery FAQs
Common questions about trolling motor runtime, fitment, charging, Bluetooth monitoring, and parallel expansion.
Will this battery fit in my current boat battery tray?
Often, yes. This battery is built around a BCI Group 31 footprint and measures 13.0 in L × 6.8 in W × 9.44 in H (330.2 × 172.7 × 239.8 mm). It suits many Group 31 trays and straps, but it is not a drop-in replacement for every lead-acid or AGM installation, so verify tray size, cable clearance, terminal orientation, and hold-down fitment before installation. Epoch offers a battery tray sized for the 3650A-H.
Is 50Ah enough to run a 36V trolling motor all day?
It depends on how hard the motor works. 50Ah (1.92kWh) is the battery’s nominal capacity, not a guaranteed usable figure; for planning, Epoch uses 80% of nominal energy, about 1,536Wh (40Ah) per battery. Runtime is roughly usable amp-hours divided by the motor’s average current draw: a 10A average draw gives about 4 hours, and a steady 500W load about 3.1 hours. Thrust setting, motor efficiency, boat weight, wind, current, and temperature change real-world results. For extended runtime, up to four batteries can be wired in parallel (up to 200Ah).
Do I need a special charger for this 36V lithium battery?
Yes. Use a 36V charger with a LiFePO4 profile or a programmable lithium charger, such as the Epoch 36V 15A LiFePO4 battery charger; do not use lead-acid, AGM, or gel profiles. Recommended settings: 42.6V–43.2V bulk/absorption, ending when charge current falls to C/20 (2.5A) or after 15 minutes, whichever comes first; float disabled (preferred) or 40.0V–40.8V; re-bulk at 39.6V; equalization disabled; temperature compensation 0mV/°C (off). Keep charge current within 50A continuous, 25A recommended. For alternator charging, a DC-to-DC charger programmed for LiFePO4 is highly recommended.
Can I connect multiple 36V 50Ah batteries together?
Yes. This battery can be wired in parallel, up to four batteries, to increase capacity. For example, two batteries in parallel create a 36V 100Ah bank. Do not wire this model in series; it is limited to one battery in series and up to four in parallel.
Does this replace three 12V trolling motor batteries?
Yes, in compatible 36V systems this single 36V lithium battery can replace a traditional three-battery 12V lead-acid trolling motor bank. Confirm your trolling motor voltage, charger compatibility, tray dimensions, cable sizing, and manufacturer requirements before replacing an existing battery bank.
Is this battery waterproof?
This model is IP65 rated, which means it is dust-tight and protected against water jets for demanding outdoor and marine environments. It is not intended for submersion, pressure washing, or installation where standing water can collect around the battery, terminals, or wiring.
Does the Bluetooth app show state of charge?
Yes. The free Epoch Li-Ion app for iOS and Android shows state of charge, voltage, current, temperature, and battery status, helping anglers track remaining power while on the water. Current is measured by a shunt built into the BMS (0.2A accuracy on discharge), so no external shunt is needed. The app asks for the Bluetooth security PIN printed on the battery’s lid the first time you connect; you can change the PIN in the app.
Does internal heating mean I can charge in freezing conditions?
Yes, with a charger connected. The battery is rated to charge from -20°C to 55°C (-4°F to 131°F) with its internal heating. At 0°C (32°F) the BMS disables charging and the incoming charge current (a LiFePO4 charger supplying at least 0.5A) powers the heating pads instead; charging resumes automatically once the battery reaches 5°C (41°F). The heater never uses stored battery energy, so it does not warm the battery during discharge or storage, and the cells never take charge below 0°C. The app may show little or no charge current while the battery warms; that is normal.
Will it work with Minn Kota, Garmin, or Lowrance trolling motors?
This battery is designed for compatible 36V trolling motor systems, including systems commonly used with brands such as Minn Kota, Garmin, and Lowrance, when voltage and current requirements match. Always confirm your motor manufacturer’s battery requirements before installation.
Can this battery be used for engine starting?
No. This model is a 36V deep-cycle LiFePO4 battery for trolling motor and compatible 36V power applications. It is not designed for engine cranking or outboard starting applications.
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Additional Resources
Safety certifications & listings
Every mark below is a standard this battery has been tested against or a listing it carries. Here is what each one covers, in plain English.
IP65
Ingress protection
Dust-tight, and protected against water jets from any direction. Under IEC 60529 the first digit rates solids and the second rates water.
- Sealed against dust and dirt
- Rain, spray and hose-down
- Outdoor and marine mounting
IEC 60529, Degrees of protection provided by enclosures
UL 1642
Lithium cell safety
The UL standard for lithium cells. Each cell design is tested for fire and explosion risk under abuse before it is built into a pack.
- Short-circuit and overcharge
- Crush, impact and shock
- Heating and temperature cycling
UL 1642, Lithium batteries
IEC 62619
Industrial battery safety
The international safety standard for rechargeable lithium cells and batteries in industrial use, including stationary energy storage.
- Electrical and mechanical abuse
- Thermal runaway propagation
- Battery management functional safety
IEC 62619, Safety requirements for secondary lithium cells and batteries for use in industrial applications
CE
EU conformity
The manufacturer's declaration that the product meets the European Union's health, safety and environmental requirements, which is required to sell it in the European Economic Area.
- Applicable EU safety directives
- Electromagnetic compatibility
- Environmental requirements
CE marking, EU declaration of conformity
RoHS
Hazardous substances
Complies with the EU Restriction of Hazardous Substances directive, which limits lead, mercury, cadmium and other toxic materials in electronics.
- Lead, mercury and cadmium below limits
- Restricted flame retardants and phthalates
- Safer to handle and recycle
Directive 2011/65/EU, Restriction of hazardous substances
UN 38.3
Transport safety
The United Nations test series every lithium battery must pass before it can be shipped by air, sea or road.
- Altitude, thermal and vibration tests
- Shock, external short-circuit and impact
- Overcharge and forced discharge
UN Manual of Tests and Criteria, Part III, sub-section 38.3
Reviews
Recent reviews
Good
The battery works great I just wish for how much I paid that it would come with a way to tell how much charge it has left.
Batteries
Batteries so far are great. Need the trays that were never sent.
Trolling Motor
We have found these are the best batteries for trolling motor installs that we do !