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Heated · Bluetooth · 36V Lithium Deep Cycle
The Epoch 36V 50Ah Essential Series LiFePO4 Battery delivers compact, high-efficiency lithium power for 36V deep-cycle applications. Built with internal heating, Bluetooth monitoring, advanced BMS protection, IP65-rated protection, and 1.92kWh of stored energy, this battery is a smart upgrade for trolling motors, marine power systems, off-grid setups, and compatible 36V equipment.
Powering Adventure.
Sustaining Tomorrow.
Advanced Lithium Battery Systems
Compact deep cycle performance with smart monitoring
The Epoch 36V 50Ah Essential Series LiFePO4 Battery is engineered for reliable deep-cycle power in 36V systems. With 1.92kWh of stored energy, 100A maximum continuous discharge, 100A maximum continuous charge capability, and a 130A peak discharge rating for up to 10 seconds, it provides efficient lithium performance for demanding 36V applications.
Built-in heating supports cold-weather charging, while Bluetooth connectivity allows battery monitoring through compatible iOS and Android apps. The advanced BMS helps protect the battery against overcharge, over-discharge, over-current, short circuit, and high or low temperature conditions. Its IP65-rated enclosure adds dependable protection for demanding marine, mobile, and outdoor environments.
36V trolling motor, marine, solar, and off-grid systems
This model is designed as a 36V heated Bluetooth deep-cycle LiFePO4 battery. It is not intended for engine cranking or starting applications. Do not wire this battery in series; this model supports a maximum of one battery in series and up to four batteries in parallel.
Smart lithium performance with cold-weather charging support
Recommended add-ons for a complete installation
Full technical details, dimensions, weight, and charging settings
| General | |
|---|---|
| Brand | Epoch Batteries |
| Model / SKU | 3650A-H |
| Series | Essential Series |
| Battery Type | Heated Bluetooth Deep Cycle LiFePO4 Battery |
| Battery Footprint | Group 31 footprint; verify fitment by dimensions |
| Chemistry | LiFePO4 / Lithium Iron Phosphate |
| Cell Type | Prismatic LiFePO4 |
| Cell Configuration | 12S |
| Bluetooth | Yes — compatible with iOS and Android apps |
| Internal Heating | Yes |
| Low-Temperature Charge Protection | Yes |
| Cycle Life | 4,000+ cycles |
| Voltage & Capacity | |
| System Voltage | 36V |
| Nominal Voltage | 38.4V |
| Nominal Capacity | 50Ah |
| Energy Stored | 1.92kWh |
| Operating Voltage Range | 30.0V – 43.8V |
| Maximum Charge Voltage | 43.8V |
| Current Ratings | |
| Max Continuous Discharge | 100A |
| Max Continuous Charge Current | 100A |
| Max Charge Current | 120A for 10 seconds |
| Max Discharge Peak Current | 130A for 10 seconds |
| Series & Parallel Configuration | |
| Series Connections | Max 1 battery in series |
| Parallel Connections | Max 4 batteries in parallel, plug & play |
| Maximum Parallel Capacity | Up to 200Ah with 4 batteries in parallel |
| Temperature | |
| Charge Temperature Range | -20°C to 55°C / -4°F to 131°F, with heating |
| Battery / Cell Charge Temperature | 0°C to 55°C / 32°F to 131°F |
| Discharge Temperature Range | -20°C to 60°C / -4°F to 140°F |
| Recommended Storage Temperature | 0°C to 35°C / 32°F to 95°F, max 12 months |
| Reconnect Temperature | 50°C / 122°F |
| Dimensions & Weight | |
| Length | 13.0 in / approx. 33.02 cm |
| Width | 6.8 in / approx. 17.27 cm |
| Height | 9.44 in / approx. 23.98 cm |
| Overall Dimensions | 13.0 in L × 6.8 in W × 9.44 in H |
| Weight | 35 lbs / approx. 15.88 kg |
| Mechanical | |
| Case Material | ABS & PC blend, UL94-V0 flame rating |
| Enclosure Protection | IP65 dust-tight and water-resistant protection |
| Terminal Type | M8 Female |
| Recommended Charging Settings | |
| Maximum Continuous Charge Current | 100A |
| Maximum Charge Current | 120A for 10 seconds |
| Bulk / Absorption Voltage | 42.6V – 43.2V |
| Absorption End Condition | Stop when charge current is ≤ C/20 or 15 minutes max |
| Float Voltage | Disabled preferred, or 40.0V – 40.8V |
| Re-Bulk Voltage | 39.6V |
| Temperature Compensation | 0mV/°C / None |
| Equalization | Disabled |
| Battery Charge Temperature Range | 0°C to 55°C / 32°F to 131°F |
| BMS High Voltage Cutoff | 43.8V |
| SoC Recalibration Voltage | 43.8V |
| Recommended Charge Rate | 50% of the battery or battery bank capacity |
| BMS Protection | |
| Overcharge Protection | Yes |
| Over-Discharge Protection | Yes |
| Over-Current Protection | Yes |
| Short-Circuit Protection | Yes |
| High & Low Temperature Disconnects | Yes |
| Compliance & Listings | |
| Certifications / Compliance | UL 1642 Cells, UL 9540A Cells, IEC 62619:2022, CE, RoHS |
| Shipping Classification | UN 38.3, Class 9 |
| Warranty | 11-Year Manufacturer Warranty |
Dust-tight · Water-resistant · Built for demanding environments
The IP65-rated enclosure helps protect the battery against dust ingress and water exposure from demanding outdoor, mobile, and marine deep-cycle environments. This makes it a strong option for boats, trolling motor systems, off-grid setups, and other applications where durability and environmental protection matter. The battery should not be submerged or installed where standing water can collect around the terminals or enclosure.
More usable energy. Less maintenance. Longer service life.
LiFePO4 technology provides stable voltage output, long cycle life, fast charging capability, and maintenance-free operation. Compared with traditional lead-acid batteries, this Epoch lithium battery delivers efficient energy storage in a lighter package while eliminating watering, acid maintenance, and routine lead-acid service.
Verify your system before installation
Always confirm battery tray dimensions, Group 31 footprint fitment, cable clearance, terminal compatibility, charger compatibility, and system requirements before installation. Use a lithium-compatible 36V charger, inverter charger, solar charge controller, or DC-to-DC charger programmed within Epoch’s recommended charging parameters. Do not wire this battery in series. For parallel battery banks, use matched batteries of the same model, age, capacity, and state of charge, and follow Epoch’s installation guidelines.
This battery is best used for compatible 36V deep-cycle applications, including 36V trolling motors, marine power systems, off-grid energy storage, backup power, and compatible 36V electric equipment.
This battery is IP65 rated, meaning it is dust-tight and water-resistant for demanding environments. It should not be submerged or installed where standing water can collect around the battery, terminals, or wiring.
No. This model is designed as a 36V deep-cycle LiFePO4 battery and is not intended for engine cranking or starting applications. Use a cranking-rated battery for starting applications.
This battery should not be wired in series. It supports a maximum of one battery in series and up to four batteries in parallel for expanded capacity. Use matched batteries of the same model, age, capacity, and state of charge.
Use a lithium-compatible 36V charger programmed for LiFePO4 batteries. Recommended charging settings include 42.6V–43.2V bulk/absorption voltage, with float disabled preferred or set to 40.0V–40.8V.
Yes. This battery includes Bluetooth monitoring and is compatible with Epoch Li-Ion apps for iOS and Android, allowing users to monitor battery status from a compatible mobile device.
Yes. This model includes internal heating to help support charging in cold conditions. It also includes low-temperature charge protection through the battery management system.
Our IP65 rating delivers serious peace of mind. Your battery is completely dust-tight and protected against low-pressure water jets from any direction, so rain, splashes, and wash-downs are no match for it. It's built to perform reliably in demanding outdoor and marine environments.