Description

Epoch 3650A-H 36V 50Ah Heated Bluetooth LiFePO4 Battery

The Epoch 3650A-H is a 38.4V nominal, 50Ah, 1.92kWh deep-cycle battery for compatible 36V trolling motors and other 36V RV, marine house-power, solar, off-grid and backup applications. Internal heating, Bluetooth monitoring and an advanced BMS are integrated into a Group 31 footprint.

Features and applications

• LiFePO4 chemistry, 4,000+ cycle life, maintenance-free operation and an 11-year limited manufacturer warranty.
• The Epoch Li-Ion app for iOS and Android displays state of charge, voltage, current and temperature.
• The BMS protects against overcharge, over-discharge, overcurrent, short circuits and high/low temperatures.
• IP65 protection is dust-tight and resists water jets; the battery is not submersible.
• A connected charger supplies the internal heating below 0°C; charging resumes at 5°C.
• Connect up to four matched batteries in parallel. Do not connect this 36V-class battery in series.

Safe installation and operation

Do not connect batteries in series or use this battery for engine cranking. Use LiFePO4-compatible charging with the 36V-specific settings in the specification tables. A connected charger must warm cold cells before they can charge. Match batteries before paralleling, install external overcurrent protection and follow the manual for wiring and temperature limits. If a charger cannot be fully programmed, verify its bulk/absorption setting and disable equalization and temperature compensation before use.

Cold-weather charging conditions

The −20°C to 55°C charge-temperature rating applies with internal heating. The cells must not accept charge while any battery temperature reading is below 0°C. A connected LiFePO4 charger supplying at least 0.5A powers the heater; it does not draw stored battery energy or heat the battery during discharge or storage. Charging pauses at 0°C and resumes at 5°C. Do not bypass the BMS, force-charge a protected battery or defeat its low-temperature lockout.

Parallel-bank conditions

Use only matched 3650A-H batteries of similar age, condition and firmware. Fully charge each battery and bring them to the same state of charge before connection. Use equal-length, equal-gauge branch cables and common busbars, with each branch fused as required by the system design and applicable standards. Do not mix models, capacities or chemistries, daisy-chain large banks or hot-connect batteries. Make bank connections with chargers, loads and disconnects off; pre-charge large inverters where required. If one battery goes offline, reduce the load because the remaining bank has less current capability.

Confirm the model and ratings on the battery label before changing charger limits; earlier production may carry different ratings. Verify tray fitment, terminal clearance, cable size, overcurrent protection, charger compatibility and load requirements before replacing a lead-acid or AGM battery.

Specifications

Charging settings

Data Sheet

• 3650A-H user manual
• 3650A-H technical data sheet