Eternal Lithium
Eternal Lithium 36V 50Ah Deep Cycle Battery
$1,149.00
Eternal Lithium 36V 50Ah Deep Cycle Battery
$1,149.00
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 50Ah Deep Cycle Battery
Power your marine and other compatible 36V applications with the Eternal Lithium 36V 50Ah Deep Cycle Battery. Built with lithium battery technology and a Group 31 form factor, this battery offers a lightweight power solution for setups where dependable energy storage and built-in battery protection matter.
Weighing just 36 lbs, it features a rated voltage of 38.4V, a 50Ah capacity, and an IP67 water and dust resistance rating. Its integrated Battery Management System (BMS) provides protection against overvoltage, undervoltage, overcurrent, temperature extremes, and short circuits.
Key Features
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36V-Class Power: Rated voltage of 38.4V for compatible electrical systems.
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50Ah Capacity: Designed to supply energy for compatible deep-cycle applications.
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Lightweight Design: Weighs 36 lbs.
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Group 31 Form Factor: Designed around a Group 31 battery size classification.
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Built-In BMS Protection: Includes overvoltage, undervoltage, overcurrent, temperature, and short-circuit protection.
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High Peak Discharge Capability: Supports a listed peak current of 150A for 3 seconds.
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IP67 Protection: Rated for water and dust resistance.
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Temperature Protection: Includes high- and low-temperature protection during charging and discharging.
Specifications
| Specification | Details |
|---|---|
| Product Name | Eternal Lithium 36V 50Ah Deep Cycle Battery |
| Rated Voltage | 38.4V |
| Rated Capacity | 50Ah |
| Battery Size Classification | Group 31 |
| Weight | 36 lbs |
| Water and Dust Resistance | IP67 |
| BMS Protection | Overvoltage, undervoltage, overcurrent, temperature, and short circuit |
Charging Specifications
| Specification | Details |
|---|---|
| Charge Voltage | 43.8V |
| Charge Mode | CC-CV |
| Listed Charge Current Range | 5A–80A |
| Recommended Charge Current | Below 25A |
| Maximum Charge Current | 50A |
| High-Temperature Protection | 60°C |
| High-Temperature Recovery | 50°C |
| Low-Temperature Protection | 0°C |
| Low-Temperature Recovery | 5°C |
| Operating Charge Temperature | 0°C to 45°C (32°F to 113°F) |
Discharging Specifications
| Specification | Details |
|---|---|
| Continuous Discharge Current | 50A |
| Maximum Peak Current | 150A for 3 seconds |
| Discharge Cutoff Voltage | 30V or 2.5V per cell |
| High-Temperature Protection | 65°C |
| High-Temperature Recovery | 55°C |
| Low-Temperature Protection | -20°C |
| Low-Temperature Recovery | -10°C |
| Operating Discharge Temperature | -20°C to 65°C (-4°F to 149°F) |
Operating and Storage Environment
| Specification | Details |
|---|---|
| Charging Temperature | 0°C to 45°C (32°F to 113°F) |
| Discharging Temperature | -20°C to 65°C (-4°F to 149°F) |
| Storage Temperature | 5°C to 45°C (41°F to 113°F) |
| Relative Humidity | 60% ± 25% |
| Water and Dust Resistance | IP67 |
Built-In Battery Management System
The integrated Battery Management System helps protect the battery during everyday operation with the following 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
Is This Battery Right for Your Setup?
The Eternal Lithium 36V 50Ah Deep Cycle Battery is an option for compatible systems that need a compact, lightweight battery with built-in protection and defined charging and discharging limits.
Before purchasing, confirm your equipment's voltage and current requirements, the available battery space, and charger compatibility. Use a charger designed for the battery's specified 43.8V charge voltage and follow the manufacturer's charging limits.
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.
- Free Shipping – Enjoy free delivery on most orders across the lower 48 U.S. states.
- 100% Secure Ordering – Our platform uses SSL encryption to protect your information.
- Exclusive Packages & Volume Discounts – Customized solutions available for clinics, wellness centers, and large orders.
- Authorized Dealer – Every order is protected with full manufacturer support and warranties.
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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