---
product_id: 673853335
title: "New 0 Cycled Li-ion Battery for Galaxy S21 5G SM-G991U/U1/B/W Series, Internal Replacement Battery Compatible with Galaxy S21 5G, Includes Instruction & Tools"
brand: "maxsharks"
price: "12.49 OMR"
currency: OMR
in_stock: true
reviews_count: 8
category: "Maxsharks"
url: https://www.desertcart.com.om/products/673853335-new-0-cycled-li-ion-battery-for-galaxy-s21-5g
store_origin: OM
region: Oman
---

# Galaxy S21 5G exact fit 0 cycle fresh Li-ion power Pro toolkit included New 0 Cycled Li-ion Battery for Galaxy S21 5G SM-G991U/U1/B/W Series, Internal Replacement Battery Compatible with Galaxy S21 5G, Includes Instruction & Tools

**Brand:** maxsharks
**Price:** 12.49 OMR
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your Galaxy S21 like new — don’t let battery drain hold you back!

## Quick Answers

- **What is this?** New 0 Cycled Li-ion Battery for Galaxy S21 5G SM-G991U/U1/B/W Series, Internal Replacement Battery Compatible with Galaxy S21 5G, Includes Instruction & Tools by maxsharks
- **How much does it cost?** 12.49 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/673853335-new-0-cycled-li-ion-battery-for-galaxy-s21-5g)

## Best For

- maxsharks enthusiasts

## Why This Product

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

## Key Features

- • **Sustainable Upgrade:** Revive your phone’s battery life and avoid costly replacements—smart, eco-friendly choice.
- • **Zero Cycle Freshness:** Brand new, never used Li-ion battery ensures peak performance and longevity.
- • **All-in-One Repair Kit:** Includes professional-grade tools and detailed instructions for confident DIY replacement.
- • **Tailored Compatibility:** Specifically engineered for Galaxy S21 5G SM-G991 series for seamless integration.
- • **Effortless Installation:** Pre-installed adhesive and extra back cover adhesive make battery swap hassle-free.

## Overview

This New 0 Cycled Li-ion Battery is a perfect internal replacement for Galaxy S21 5G SM-G991 series phones. It comes with pre-installed adhesive and an extra back cover adhesive for easy installation, plus a comprehensive toolkit and step-by-step guide to empower you to perform a professional-grade battery swap. Designed to restore your phone’s battery life and performance, this kit offers a cost-effective, sustainable alternative to buying a new device.

## Description

New 0 Cycled Li-ion Battery for Galaxy S21 5G SM-G991U/U1/B/W Series, Internal Replacement Battery Compatible with Galaxy S21 5G, Includes Instruction & Tools

Review: Defective Battery - Received defective battery. Old battery was charging phone but charge was not lasting. So I purchased this replacement battery for my Xiaomi 9T Pro. Item received with packaging in tact and installation attempted as per instructions. However new battery would not charge. On examination of old and new batteries, new battery is missing a metal part on the end. I am not in US. Return will be costly and is not an option. Now I'm stuck with a defective battery I cannot use 😩
Review: Replacement Battery Works Great - My phone works like new with this new battery. At around 4 years old, the old battery was causing the phone to spontaneously turn off without warning. Now the phone works perfectly again. Note that, although this is a great solution for breathing new life into an older phone, cell phone manufacturers go out of their way to make sure you can't easily replace the battery in an effort to force people to buy a new phone. LG is no exception, and in this case, they have not only glued on the back cover with no slot to get a prying tool started, but they made the back cover out of material that shatters like thin glass if you over-bend it even slightly. You will need a hair dryer (I used a heat gun) to soften the glue that holds the back cover on, and a lot of patience if you plan on getting the cover off without breaking it. Plan on needing to also buy a replacement back cover, but fortunately the back cover is readily available all over the internet for this phone for about 10 or 12 bucks. Very happy to have a like-new phone without senselessly spending hundreds of dollars on a new one when the old one does the job just fine.

## Features

- Compatible Phone Model: This battery kit is specifically designed for Galaxy S21 5G SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W series, please double confirm your phone model before purchasing
- Important: To achieve optimal calibration, a new battery should undergo at least three full charge and discharge cycles.
- Original back cover adhesive included: The battery comes with a pre-installed adhesive—just peel off the protective film and firmly press the battery into place for straightforward installation. The package also contains a pre-cut adhesive for the back cover, enhancing convenience.
- Comprehensive repair guide: A detailed repair guide is included in the package, providing you with the information needed to confidently carry out the repair on your own.
- Complete professional toolkit: This kit includes a carefully selected range of tools necessary for the repair process, ensuring a professional and safe experience. Designed for ease of use, it gives you the confidence to complete your repair efficiently.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DK5V98GX |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Best Sellers Rank | #47,436 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #254 in Cell Phone Replacement Batteries |
| Customer Reviews | 4.2 4.2 out of 5 stars (83) |
| Date First Available | October 16, 2024 |
| Item Weight | 4.6 ounces |
| Item model number | EB-BG965ABA |
| Manufacturer | MAXSHARKS |
| Package Dimensions | 8.31 x 5.12 x 0.67 inches |

## Product Details

- **Battery Cell Composition:** Lithium Ion
- **Brand:** MAXSHARKS
- **Number of Batteries:** 1 Lithium Polymer batteries required. (included)
- **Recommended Uses For Product:** Phone
- **Unit Count:** 1.0 Count

## Images

![New 0 Cycled Li-ion Battery for Galaxy S21 5G SM-G991U/U1/B/W Series, Internal Replacement Battery Compatible with Galaxy S21 5G, Includes Instruction & Tools - Image 1](https://m.media-amazon.com/images/I/81Gj6RUOQ0L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Defective Battery
*by D***I on July 7, 2025*

Received defective battery. Old battery was charging phone but charge was not lasting. So I purchased this replacement battery for my Xiaomi 9T Pro. Item received with packaging in tact and installation attempted as per instructions. However new battery would not charge. On examination of old and new batteries, new battery is missing a metal part on the end. I am not in US. Return will be costly and is not an option. Now I'm stuck with a defective battery I cannot use 😩

### ⭐⭐⭐⭐⭐ Replacement Battery Works Great
*by J***H on May 30, 2023*

My phone works like new with this new battery. At around 4 years old, the old battery was causing the phone to spontaneously turn off without warning. Now the phone works perfectly again. Note that, although this is a great solution for breathing new life into an older phone, cell phone manufacturers go out of their way to make sure you can't easily replace the battery in an effort to force people to buy a new phone. LG is no exception, and in this case, they have not only glued on the back cover with no slot to get a prying tool started, but they made the back cover out of material that shatters like thin glass if you over-bend it even slightly. You will need a hair dryer (I used a heat gun) to soften the glue that holds the back cover on, and a lot of patience if you plan on getting the cover off without breaking it. Plan on needing to also buy a replacement back cover, but fortunately the back cover is readily available all over the internet for this phone for about 10 or 12 bucks. Very happy to have a like-new phone without senselessly spending hundreds of dollars on a new one when the old one does the job just fine.

### ⭐⭐⭐⭐ Pretty good back panel and battery replacement kit.
*by J***S on December 17, 2025*

I've been using this for a few months now, and it's a nice little kit. I didn't realize the geniuses at Samsung made the back of my phone out of glass! Brilliant. The battery seems okay. I'm not sure I got any additional charge capacity out of this battery, but my old one was dead and this one is doing the job.

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-03-14*