---
product_id: 393550739
title: "12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS"
brand: "nermak"
price: "€ 116.50"
currency: EUR
in_stock: true
reviews_count: 8
category: "Nermak"
url: https://www.desertcart.sk/products/393550739-12v-18ah-lithium-lifepo4-deep-cycle-battery-2000-cycles-lithium
store_origin: SK
region: Slovakia
---

# 20A continuous heavy-duty output 2000+ cycles lifespan Only 2.97 lbs, ultra-lightweight 12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS

**Brand:** nermak
**Price:** € 116.50
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your life smarter, lighter, and longer—never settle for less!

## Quick Answers

- **What is this?** 12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS by nermak
- **How much does it cost?** € 116.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/393550739-12v-18ah-lithium-lifepo4-deep-cycle-battery-2000-cycles-lithium)

## Best For

- nermak enthusiasts

## Why This Product

- Trusted nermak brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Powerhouse Output:** Delivers a robust 20A continuous discharge for demanding devices
- • **Endurance Champion:** Over 2000 deep cycles for years of reliable power
- • **Smart Safety Guard:** Built-in 20A BMS protects against overcharge, discharge, and short circuits
- • **Featherweight Design:** Weighs just 2.97 lbs—1/3 the weight of traditional lead-acid batteries
- • **Versatile & Expandable:** Connect up to 4 batteries in series/parallel for scalable power solutions

## Overview

The NERMAK 12V 18Ah LiFePO4 deep cycle battery offers an ultra-lightweight, high-capacity power source with over 2000 charge cycles. Featuring a built-in 20A Battery Management System, it ensures superior safety and longevity, making it ideal for solar setups, marine use, scooters, and emergency backup. Its expandable design supports series or parallel connections, delivering flexible, maintenance-free energy for modern professionals who demand reliability and efficiency.

## Description

desertcart.com: NERMAK 12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS : Automotive

Review: Great cost for an effective replacement. - Although slightly shorter in height than original batteries, work like a charm. I have replaced the batteries in a 90's fold n go power scooter with these amazing little gems. Can and does still use its original charger, battery pack is now half the weight of what it used to be, and packs quite the punch. Installed very easily by swapping everything over to the new batteries, fully charged in very little time and scooter that had been sitting for years was back on the road.
Review: Update - failed within 1 day - Update 4 days later, 10/11/2024 Well...this did not work out. The battery arrived and was installed on Monday, just before Hurricane Milton struck Wednesday night. After a1/2 second test crank (which was fine), the battery was connected to a new LiFePo4 battery charger designed for this battery chemistry. The charger itself may be suspect, as the battery would not accept a charge. The charger displayed a fault mode after a few hours. I then connected it to a known good charger. After a charge of several hours at 2amps, the charger had to be disconnected as we prepped for the storm. A quick check on Tuesday (the next day) found that the generator would not start. Did not have time to do diagnostics with the storm coming. Had to pull-start the generator after we lost power Wednesday evening. Did diagnostics today, Friday 10/11. No problem with the starter motor, as it started immediately with my portable jumper pack. The Nermark battery showed less than 10V on my DVM. Both chargers displayed a battery fault, and were unable to charge the battery above 10.3V. It's possible there was an issue with the built-in BMS (Battery Management System), but I don't know. It's getting returned once Whole Foods is open again. Original Review 10/7/2024 Very simple installation to remove the old sealed lead acid 12-18 battery and replace it with this one. I have been using LiFePo4 batteries in my RC aircraft for over 20 years and I'm glad that this battery is available to replace the typical unreliable lead acid battery that is used as a starter in portable equipment. I took the opportunity to install the terminal rings and cable for the appropriate 3 amp charger and even without completing the charge, did a quick test start on my generator. I hope it will last several years, as this generator is only used for hurricane emergencies. However, I have batteries of this chemistry that are over 20 years old and still hold 80% or more of their charge. I will report back and update this review in the event that there are any failures, or possibly great news to continue to report years from now.

## Features

- 【Superior Performance】: Lithium iron phosphate battery has high energy density, Long cycle life, Good safety performance, No memory effect, etc. NERMAK LiFePO4 battery has built-in BMS protection to prevent overcharge, Over-discharge, Over-current and short circuit, and excessive low self-discharge rate ensuring up to 1-year maintenance-free storage.
- 【Long life & light weight】: 2000+ cycles of lithium-ion batteries are no problem, while traditional lead-acid batteries only have 200-500 cycles. The battery does not contain acid, which is safer and more environmentally friendly than lead-acid batteries. Our lithium iron phosphate battery weighs only 5.1 pounds, which is only 1/3 of the weight of a lead-acid battery.
- 【Widely Uses】: Widely uses in most areas such as: UPS backup, Lighting (LED strip etc), Ham Radio portable, RV/outdoor camping, Marine, Fish finder, Backup power, Tool trailer, Backup power supply, Off-Grid applications, Solar/Wind power and more...
- 【Expansion and Recharge】Can be connected in series or parallel, in series, Up to 4 identical batteries can be connected，Quick charge by 12A , and heavy-duty output discharge up to 20A continuous and 3C Pulse.
- 【Warm Note】: 1* Replacement lithium ion battery，12 months warranty, If you have any question for our product, Contact us: click the "Ask a question" on our storefront or in "YOUR ORDER" options click the "contact seller" (please use LiFePo4 special charger, with fully automatic SLA charger may not be fully charged)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09H353H6M |
| Battery Capacity | 18 Amp Hours |
| Battery Cell Composition | Lithium-Phosphate |
| Battery Type | Lithium-Phosphate |
| Best Sellers Rank | #11,322 in Health & Household ( See Top 100 in Health & Household ) #12 in 12V Batteries |
| Brand | NERMAK |
| Brand Name | NERMAK |
| Customer Reviews | 4.3 out of 5 stars 2,959 Reviews |
| Included Components | 1*12V 18Ah LiFePO4 Battery |
| Item Height | 6.69 inches |
| Item Weight | 2.97 Pounds |
| Manufacturer | NERMAK |
| Manufacturer Part Number | 12V 18Ah |
| Manufacturer Warranty Description | 1 year |
| Size | 12V 18Ah |
| Unit Count | 1 Count |
| Voltage | 12.8 Volts |

## Product Details

- **Battery Capacity:** 18 Amp Hours
- **Battery Cell Composition:** Lithium-Phosphate
- **Brand:** NERMAK
- **Item Weight:** 2.97 Pounds
- **Manufacturer:** NERMAK
- **Size:** 12V 18Ah
- **Voltage:** 12.8 Volts

## Images

![12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS - Image 1](https://m.media-amazon.com/images/I/612CxDI2Z+L.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great cost for an effective replacement.
*by D***S on August 14, 2025*

Although slightly shorter in height than original batteries, work like a charm. I have replaced the batteries in a 90's fold n go power scooter with these amazing little gems. Can and does still use its original charger, battery pack is now half the weight of what it used to be, and packs quite the punch. Installed very easily by swapping everything over to the new batteries, fully charged in very little time and scooter that had been sitting for years was back on the road.

### ⭐⭐⭐⭐⭐ Update - failed within 1 day
*by R***N on October 7, 2024*

Update 4 days later, 10/11/2024 Well...this did not work out. The battery arrived and was installed on Monday, just before Hurricane Milton struck Wednesday night. After a1/2 second test crank (which was fine), the battery was connected to a new LiFePo4 battery charger designed for this battery chemistry. The charger itself may be suspect, as the battery would not accept a charge. The charger displayed a fault mode after a few hours. I then connected it to a known good charger. After a charge of several hours at 2amps, the charger had to be disconnected as we prepped for the storm. A quick check on Tuesday (the next day) found that the generator would not start. Did not have time to do diagnostics with the storm coming. Had to pull-start the generator after we lost power Wednesday evening. Did diagnostics today, Friday 10/11. No problem with the starter motor, as it started immediately with my portable jumper pack. The Nermark battery showed less than 10V on my DVM. Both chargers displayed a battery fault, and were unable to charge the battery above 10.3V. It's possible there was an issue with the built-in BMS (Battery Management System), but I don't know. It's getting returned once Whole Foods is open again. Original Review 10/7/2024 Very simple installation to remove the old sealed lead acid 12-18 battery and replace it with this one. I have been using LiFePo4 batteries in my RC aircraft for over 20 years and I'm glad that this battery is available to replace the typical unreliable lead acid battery that is used as a starter in portable equipment. I took the opportunity to install the terminal rings and cable for the appropriate 3 amp charger and even without completing the charge, did a quick test start on my generator. I hope it will last several years, as this generator is only used for hurricane emergencies. However, I have batteries of this chemistry that are over 20 years old and still hold 80% or more of their charge. I will report back and update this review in the event that there are any failures, or possibly great news to continue to report years from now.

### ⭐⭐⭐⭐⭐ Great little battery
*by J***R on November 12, 2025*

This small lithium battery has performed very well through six fishing outings supplying Power to my Humminbird Helix 5 fish finder. It holds the charge through 6 hours on the water. I highly recommend this light weight battery.

## Frequently Bought Together

- NERMAK 12V 18Ah Lithium LiFePO4 Deep Cycle Battery, 2000+ Cycles Lithium Iron Phosphate Rechargeable Battery for Solar Power, UPS, Lighting, Marine, Scooters, Fish Finder and More, Built-in 20A BMS
- ULTRAPOWER 4-Amp 14.6 Volt LiFePO4 Battery Charger,12.8 Volt LiPO Lithium Battery Charger,Smart Charger Maintainer for Cars,Motocycles,Golf Carts,UAV,Fishing Boat and Deep Cycle Batteries.

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-27*