Eternal Lithium
Eternal Lithium 36V 67Ah Deep Cycle Battery
$1,349.00
Eternal Lithium 36V 67Ah Deep Cycle Battery
$1,349.00
Get it between October 26 and October 28.
Low in stock
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At MarineXGear, we are proud to have the best refund and return policies in the industry. If you’re not satisfied with your purchase for any reason, you may return it to us within 30 days for a refund.
If you have a problem with our order (there are missing components, damages, or the product is not functioning), please reach out to us as quickly as possible. Some of the problems can be resolved by going through the product manual or the product FAQs.
Refer to our Refunds & Return Policy for more details.
Order Processing
Once we receive your order, we will send you a confirmation email. Then we will process the order by confirming that the product is in stock and ready for shipment. If any of the items in your order are back-ordered, we will reach to you via email or phone and you may choose to either wait or receive a 100% refund.
Please allow 1-3 days for processing your order.
Shipping
We ship to the lower 48 continental United States only at this time.
Shipping times and shipping method will depend on the specific product and brand you purchase. If you have any shipping question, feel free to ask on the chat or email us at info@marinexgear.com.
We will send tracking information by email the same day the shipping tracking number is created/available.
Before you sign the shipping bill, please THOROUGHLY INSPECT YOUR ITEM. Signing for the receipt of a damaged product removes the liability of the shipping company and MarineXGear. Once you accept your shipment as non-damage, your item is your property.
Eternal Lithium 36V 67Ah Deep Cycle Battery
Power your time on the water with the Eternal Lithium 36V 67Ah Deep Cycle Battery. Designed for demanding trolling motor use, this battery delivers a listed 67Ah capacity in a Group 31 shell that fits a standard-sized Group 31 battery tray, helping simplify installation in compatible marine setups.
Whether you're covering large areas of water or spending long hours fishing, this battery is designed to provide dependable power for your marine adventures. It also comes with a 12-year warranty, subject to the manufacturer's terms and conditions.
Key Features
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67Ah Battery Capacity: Designed for compatible 36V marine and trolling motor applications.
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Group 31 Form Factor: Fits standard-sized Group 31 battery trays, subject to fitment verification.
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LiFePO4 Battery Technology: Uses UL-certified 32700 cylindrical lithium iron phosphate cells.
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Integrated Battery Management System (BMS): Includes overvoltage, undervoltage, overcurrent, temperature, and short-circuit protection.
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IP67 Protection Rating: Listed water and dust resistance.
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Durable ABS Housing: Built with an ABS battery shell.
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12-Year Warranty: Warranty coverage is subject to the manufacturer's terms and conditions.
Battery Specifications
| Specification | Details |
|---|---|
| Product Name | Eternal Lithium 36V 67Ah Deep Cycle Battery |
| Rated Voltage | 38.4V |
| Rated Capacity | 67Ah |
| Maximum Charge Voltage | 43.8V |
| General Cut-Off Voltage | 30V |
| General Charge Current | 40A |
| Continuous Discharge Current | 80A |
| Maximum Discharge Current | 160A |
| Battery Size | Group 31 |
| Weight | 56 lb |
| Cell Type | UL-certified 32700 cylindrical LiFePO4 cells |
| Cell Configuration | 12S14P |
| Housing | ABS shell |
| Water and Dust Resistance | IP67 |
| Warranty | 12 years, subject to manufacturer terms |
Battery Management System (BMS)
The battery includes the following listed protection functions:
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Overvoltage protection
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Undervoltage protection
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Overcurrent protection
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Temperature protection
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Short-circuit protection
Standard Charging Specifications
| Specification | Details |
|---|---|
| Charge Voltage | 43.8V |
| Charge Mode | CC-CV |
| Listed Charge Current Range | 5A–80A |
| Recommended Charge Current | Below 40A |
| Maximum Charge Current | 80A |
| High-Temperature Charge Protection | 60°C |
| High-Temperature Recovery | 50°C |
| Low-Temperature Charge Protection | 0°C |
| Low-Temperature Recovery | 5°C |
Standard Discharge Specifications
| Specification | Details |
|---|---|
| Continuous Discharge Current | 80A |
| Maximum Peak Discharge Current | 160A for 5 seconds |
| Discharge Cut-Off Voltage | 40V |
| High-Temperature Protection | 65°C |
| High-Temperature Recovery | 55°C |
| Low-Temperature Protection | -20°C |
| Low-Temperature Recovery | -10°C |
Operating Environment
| Condition | Temperature Range |
|---|---|
| Charging | 0°C to 45°C (32°F to 113°F) |
| Discharging | -20°C to 65°C (-4°F to 149°F) |
| Storage | 5°C to 45°C (41°F to 113°F) |
| Listed Relative Humidity | 60% ± 25% |
Built for Long Days on the Water
The Eternal Lithium 36V 67Ah Deep Cycle Battery is designed for boat owners who want a high-capacity battery in a familiar Group 31 form factor. Its listed lithium cell technology, built-in battery protection features, and warranty make it an option worth considering for compatible trolling motor setups.
Before purchasing, confirm your trolling motor's voltage and current requirements, battery tray dimensions, and charger compatibility with the manufacturer.
Why Choose MarineXGear
At MarineXGear, we believe true peace of mind on the water starts with having the right equipment. Our mission is simple: to be the trusted destination for premium marine gear and dependable on-water solutions. Every product we carry — whether navigation systems, safety equipment, marine electronics, or boat accessories — is carefully chosen to help you perform at your best, stay safe, and get the most out of every voyage.
A+ Customer-First Approach
We're more than an online store — we're your partner on the water. Unlike large, impersonal retailers, our dedicated team delivers personalized guidance at every step. Whether you're outfitting a vessel for the first time, upgrading your gear, or need expert advice on a specific product, our specialists are always just a call or email away.
Passion for Wellness & Resilience
Our brand is built on a genuine love for the sea. We live and breathe marine equipment — and when you reach out to MarineXGear, you'll connect with experts who understand both the technical specs of our products and the on-water lifestyle they support.
Trusted Experts, Curated Brands
We partner directly with the most respected names in the marine industry. Our curated selection ensures every product meets our high standards for quality, durability, and performance on the water. With MarineXGear, you shop with confidence, knowing you're investing in proven gear backed by full manufacturer warranties.
More Reasons to Choose MarineXGear
- Price Match Guarantee – We’ll match any competitor to ensure you always receive the best value.
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At MarineXGear, we're committed to keeping you safe, equipped, and confident on the water. With our expertise, personalized service, and carefully curated selection, you can invest in your vessel and your adventures with complete peace of mind.
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