Epoch Batteries
Epoch Batteries 36V 50Ah Heated LiFePO4 Battery With Bluetooth
Epoch Batteries 36V 50Ah Heated LiFePO4 Battery With Bluetooth
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- Price: $749.00
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PRODUCT DESCRIPTION
- 🇺🇸Free ShippingContiguous 48 states
- 🛡️11-Year Battery WarrantyBacked by Epoch
- 🎣One Battery, Not ThreeFull 36V in 35 lb
- 🔥Self-HeatingCharges down to -20°C
- 📱Bluetooth + Built-In ShuntCheck charge from your phone
- 📞Real Human SupportSizing & setup questions
One 36V battery in place of three 12V lead-acid batteries. The Epoch 36V 50Ah Essential Series stores 1.92kWh in a single BCI Group 31 size case that weighs 35 lb. It's built to power 36V trolling motors on its own, so there are no jumper cables between batteries and no three-bank charger to manage. An internal heater lets it charge in freezing weather, Bluetooth with a built-in shunt shows your state of charge on your phone, and the IP65 case holds up to spray on the deck.
🔧 Will It Fit & Work for You?
A 36V battery in a BCI Group 31 size, made to replace a three-battery 12V trolling motor bank. Popular uses include:
- 36V trolling motors
- Minn Kota, Garmin & Lowrance 36V systems
- Bass & fishing boats
- Replacing three 12V lead-acid batteries
- Cold-weather & early-season fishing
- 36V solar & off-grid systems
- Your motor is a 36V trolling motor. This battery is not for 12V, 24V or 48V systems and can't be wired in series.
- Your space fits 13.0" L × 6.8" W × 9.44" H (Group 31 size), with room for cables and a hold-down, and can handle 35 lb.
- Your motor's maximum draw stays within 100A continuous, with up to 130A for 10-second surges. Size fuses and cables to the 100A rating.
- You have a single-output 36V LiFePO4 charger (sold separately). A three-bank 12V charger won't work with one 36V battery.
- It's a deep-cycle battery, not for starting engines. Add a properly sized fuse or breaker near the positive terminal.
Why Anglers Make the Switch
One Battery Instead of Three
A full 36V system in one 35 lb case. No series jumpers between batteries, no uneven charging, and a lot less weight in the boat.
Charges in the Cold
Below freezing, charging current powers internal heaters (never your stored energy). Charging resumes automatically at 5°C (41°F). Tested to -20°C.
Bluetooth With a Built-In Shunt
The free Epoch Li-Ion app shows state of charge, voltage, current and temperature, so you know how much time on the water you have left.
IP65 Case
Dust-tight and protected against water jets, so spray and rain on deck aren't a problem. Not submersible.
Longer Days in Parallel
Connect up to 4 matched batteries in parallel for 200Ah and 7.68kWh at 36V.
Zero Maintenance
No watering, no acid, no terminal cleaning. Rated for 4,000+ cycles.
⏱️ How Long Will It Run?
| Constant load | Estimated runtime |
|---|---|
| 10A average draw | About 4 hours |
| 100W | About 15.4 hours |
| 250W | About 6.1 hours |
| 500W | About 3.1 hours |
Epoch planning estimates per battery, based on 80% of nominal energy (about 1,536Wh, 40Ah). Real trolling time varies with thrust setting, wind, current, boat weight and temperature. Batteries in parallel multiply runtime.
📦 What's in the Box
-
36V 50Ah Heated LiFePO4 Battery (3650A-H)Bluetooth, built-in shunt & internal heater
Lithium vs. a Three-Battery Lead-Acid Bank
| Epoch 36V 50Ah Heated | Typical Lead-Acid | |
|---|---|---|
| Batteries for 36V | 1 | 3 |
| Weight | 35 lb | Many times heavier |
| Usable capacity | Most of the rated 50Ah | About half, to protect battery life |
| Cold-weather charging | Built-in heater | Slow & inefficient |
| Phone monitoring | Yes, with built-in shunt | No |
| Maintenance | None | Watering & cleaning |
| Warranty | 11-year limited | Usually 1–2 years |
🔌 Charging Made Simple
Recommended: 25A
Charge at 25A for best results (50A max). Epoch's 36V 15A charger refills an empty battery in roughly 3.3 to 3.5 hours plus absorption.
No Lead-Acid Modes
Use a 36V charger with a LiFePO4 profile. Turn off equalization, desulfation and "repair" modes, and set temperature compensation to 0.
Cold-Weather Charging
Below 0°C (32°F), a charger supplying at least 0.5A powers the heater. Charging resumes automatically at 5°C (41°F).
Charging From an Alternator?
Epoch recommends a DC-to-DC charger programmed for LiFePO4. Settings for other chargers are in the spec table.
🛡️ 11-Year Limited Warranty
Register with Epoch within 90 days of purchase or keep your proof of purchase. Full terms at epochbatteries.com.
📋 Full Specifications
| Electrical | |
| Chemistry | LiFePO4, prismatic cells |
|---|---|
| Configuration | 12S |
| Nominal Voltage | 38.4V (36V class) |
| Capacity / Energy | 50Ah / 1,920Wh (1.92kWh) |
| Operating Voltage | 30.0V – 43.8V |
| Continuous Discharge | 100A (25A recommended) |
| Peak Discharge | 130A (up to 10 sec) |
| Max Continuous Charge | 50A |
| Peak Charge | 120A (up to 10 sec) |
| Recommended Charge Current | 25A |
| Cycle Life | 4,000+ cycles |
| Series / Parallel | Series not permitted / up to 4 in parallel (200Ah, 7.68kWh), matched batteries |
| Physical | |
| BCI Group Size | Group 31 |
| Dimensions (L × W × H) | 13.0" × 6.8" × 9.44" |
| Metric | 330.2 × 172.7 × 239.8 mm |
| Weight | 35 lb (15.9 kg) |
| Case | ABS/PC blend, UL94-V0 flame rating |
| Ingress Rating | IP65 (dust-tight, protected against water jets, not submersible) |
| Terminals | M8 female, 8–12 Nm (71–106 in-lb) |
| Bluetooth | Yes, Epoch Li-Ion app with built-in shunt |
| Temperature | |
| Charge | -20°C to 55°C (-4°F to 131°F) with internal heating |
| Discharge | -20°C to 60°C (-4°F to 140°F) |
| Storage (recommended) | 0°C to 35°C (32°F to 95°F), up to 12 months |
| Internal Heater | Yes, powered by charge current (0.5A minimum) |
| Charger Settings | |
| Bulk / Absorption | 42.6V – 43.2V |
| Absorption End | C/20 (2.5A) or 15 minutes |
| Float | Disabled (preferred) or 40.0V – 40.8V |
| Re-Bulk | 39.6V |
| Max Charge Voltage | 43.8V |
| Temp Compensation / Equalization | Off / Off |
| Certifications | |
| Cells | UL 1642, IEC 62619:2022 |
| Product | CE, RoHS |
| Transport | UN 38.3, Class 9 |
| Ordering | |
| SKU | 3650A-H |
📄 Manuals & Downloads
📱 Get the free Epoch Li-Ion app: App Store · Google Play
❓ Common Questions
Can this replace my three 12V trolling motor batteries?
Will it work with my Minn Kota, Garmin or Lowrance motor?
Will it fit my battery tray?
What charger do I need?
How long will it run my trolling motor?
Can I wire two in series for 72V?
How does the heater work?
Is it waterproof?
How should I store it over the off-season?
Questions About Your Setup? Ask Us First.
Tell us your trolling motor model and how you fish, and we'll help you pick the right battery, charger and tray.
LiFePO4 Chemistry
Lithium iron phosphate cells, one of the most stable lithium chemistries available
Built-In Smart BMS
Guards against overcharge, over-discharge, over-current, short circuit & temperature extremes
Zero Maintenance
No watering, no acid, no terminal cleaning
Backed by Epoch
Manufacturer warranty, plus real help from our team at 833-664-7433