Epoch Batteries 36V 50Ah Essential Series 3650A-H | LiFePO4 Battery (1.92kWh) | Group 31, Heated, Bluetooth

Specifications

Dimensions (L x W x H): 13.0 x 6.8 x 9.44 in

Weight: 35 lb

Cell Configuration: 12S

Chemistry: LiFePO4

Voltage: 38.4V

Max Charge Voltage: 43.8V

Operating Voltage Range: 30.0 - 43.8V

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

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)

BMS Protection: Over Voltage, Under Voltage, Over-Current, Short Circuit, Over Temperature, Under Temperature

Model / SKU: 3650A-H

Group Size: BCI Group 31; verify fitment by dimensions

Cell Type: Prismatic LiFePO4

Energy Stored: 1.92kWh (1,920Wh), nominal

Recommended Discharge Current: 25A (0.5C)

Current Sensing: BMS-integrated shunt; 0.2A accuracy on discharge

Heating System: Tested to -20°C / -4°F; rated external ambient down to -40°C / -40°F

Case Material: ABS / PC blend, UL94-V0 flame rating

Enclosure Protection: IP65 per IEC 60529 — dust-tight, protected against water jets; not submersible

Terminal Type: M8 female

Terminal Torque: 8–12 N·m (71–106 in-lb)

Cycle Life: 4,000+ cycles

Cell-Level Certifications: UL 1642; IEC 62619:2022 (cells, not the complete battery assembly)

Product Compliance: CE; RoHS; UN 38.3, Class 9

3650A-H Spec Sheet
3650A-H User Manual
3650A-H Technical Data Sheet

Epoch Batteries Limited Warranty

Warranty Period
11-year limited manufacturer warranty; register within 90 days of purchase for full coverage

Epoch Batteries-branded products are covered against qualifying defects in materials and workmanship for the applicable warranty period, subject to Epoch's model-specific remedy schedule and the terms of its warranty policy. Epoch-branded chargers carry a 2-year limited warranty and accessories (such as fuel gauges and voltage reducers) a 1-year limited warranty, from the original purchase date.

Registration
Register your battery with Epoch within 90 days of purchase for full warranty coverage. If it is not registered within that time, the warranty period begins from the battery's original manufacturing date. Proof of ownership is required for any claim, and coverage is non-transferable and applies only to the original purchaser.

Remedy
After inspection and testing, Epoch will provide the applicable remedy for a qualifying manufacturing defect: an approved repair, a replacement, or a comparable-product offer according to the model's schedule. Typical repair turnaround is 3–10 business days once the product is received.

Exclusions
Coverage may be denied when a failure is caused by misuse, improper handling, installation or storage, or use outside the product's specifications. Examples include an unsecured battery; loose, corroded or improperly connected terminals; series or parallel connections beyond the manufacturer's recommendations; reverse polarity or short circuits; impact, fire or water submersion; storage above 140°F or below -40°F; prolonged storage fully discharged or batteries left uncharged for more than three months; poor crimps, undersized cables or damaged wiring; opened, modified or tampered products; and use in applications the battery was not designed for, including repeated engine starting on non-cranking models.

Obtaining Warranty Service
Start a claim through the Epoch Batteries Warranty Portal with your model and serial number, proof of purchase, a description of the issue and supporting photos or videos. If approved, Epoch provides an RMA number and packing instructions. Do not ship a product without a valid RMA. The customer arranges and pays for shipment to Epoch, packaged in compliance with lithium battery shipping rules. Epoch Batteries can be reached at 1-888-501-1846 or support@epochbatteries.com.

Visit Epoch's Warranty Page to review the full warranty terms.

Shipping is typically through freight carriers and the actual shipping time is contingent on your location and the specific warehouse dispatching your order. Please allow for a 1-3 business day processing period before shipment, and an estimated delivery time of up to 7 business days. Your confirmation email will include delivery details and we will send you a tracking number as soon as one is available. If you ordered several separate items, you may receive multiple tracking numbers. Once the item has been shipped, the freight service will contact you to coordinate the date and time of delivery. If you require any special accommodations during delivery please let us know as soon as possible and let the delivery company know when arranging the appointment.

Typically, orders will be dropped off either curbside or outside your front door or garage. It is your responsibility to bring the order inside or to its final destination and to remove any existing items.

Depending on the item, parts may be shipped in multiple boxes, and assembly may be required. When your order is delivered, please check that you have all pieces of the item and that nothing is damaged. If your order is damaged during transit and external damage is visible, note the damage immediately, write it on the delivery documents, take photos and/or videos, and refuse shipment. If there is no visible external damage, accept the package but note “subject to concealed damage” on the delivery documents. Any damage upon delivery needs to be reported within 24 hours of delivery or you may not be eligible for a refund. For additional information on submitting claims, as well as incorrect item exchanges, and replacements, please see our Refund Policy.

For more information about shipping, please visit our complete Shipping Policy.

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