---
product_id: 210074064
title: "CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black)"
brand: "lefix"
price: "₨4766"
currency: LKR
in_stock: true
reviews_count: 8
category: "Le Fix"
url: https://www.desertcart.lk/products/210074064-cmos-battery-rtc-memory-bios-battery-for-dell-latitude-e5440
store_origin: LK
region: Sri Lanka
---

# Reliable Japanese battery tech 3V, 250mAh high-capacity power Standard 2-pin Molex connector CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black)

**Brand:** lefix
**Price:** ₨4766
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your legacy devices with precision and reliability!

## Quick Answers

- **What is this?** CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) by lefix
- **How much does it cost?** ₨4766 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/210074064-cmos-battery-rtc-memory-bios-battery-for-dell-latitude-e5440)

## Best For

- lefix enthusiasts

## Why This Product

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

## Key Features

- • **Plug & Play Compatibility:** Seamlessly fits multiple Dell Latitude and Alienware models with a standard 2-pin Molex connector.
- • **Uninterrupted BIOS Memory:** Keep your system clock and BIOS settings flawless with a stable 3V power source.
- • **Lightweight & Compact Design:** At just 4 grams and slim dimensions, it fits discreetly without adding bulk.
- • **Premium Japanese Battery Core:** Experience longevity and reliability powered by trusted Japanese battery technology.
- • **Anti-Static Professional Packaging:** Ensures your battery arrives safe and ready for long-term performance.

## Overview

This CMOS RTC BIOS battery delivers a steady 3V and 250mAh capacity, engineered with premium Japanese lithium manganese dioxide cells. Designed for seamless compatibility with a wide range of Dell Latitude and Alienware laptops, it features a standard 2-pin Molex connector for easy installation. Packaged professionally in anti-static bags, it ensures long-lasting performance and system stability by preserving BIOS settings and real-time clock functions.

## Description

Buy CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black): Batteries - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Replacement for mini PC battery that failed - My mini PC had one of these that had failed, and it would cause the PC to reset the CMOS on every boot, which would take a minute or two when rebooting rather than the usual 15 seconds. Once I figured out that it was caused by the CMOS backup battery, I found this replacement and it worked perfectly. I can't speak to longevity as I've only had it in the PC for about a month, but I did test it with a multimeter and it had the expected voltage when it arrived.
Review: It's a CMOS battery so... - Whats to review on a CMOS battery... Pro: 1. It plugged in. 2. It worked. 3. Laptops good now Con: now I have to toss the old battery out 🤷

## Features

- Battery Data:3V 250mAh
- The Core Battery is made by Japanese Battery Giant.High Quality and Reliable.
- The Battery Connector with Wires:Standard 2Pin and 2 Wire with 1.25 Pitch Connector,Molex MX51021-0200-B
- The Professional Packaging with Anti-static Bag Ensure the Battery with Long Life Span.
- Compatible with E5440 E5450 E6440 E6420 E6230 E6520 E7440 E7240 Alien-ware 17R3

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B089DX8VK1 |
| Amperage | 3 Amps |
| Antenna Location | Laptop |
| Battery Capacity | 250 Milliamp Hours |
| Battery Cell Composition | Lithium Manganese Dioxide |
| Battery Cell Type | Lithium Manganese Dioxide |
| Battery Weight | 4 Grams |
| Best Sellers Rank | #35,683 in Electronics ( See Top 100 in Electronics ) #315 in Laptop Batteries |
| Brand | LeFix |
| Compatible Phone Models | For Certain Laptop Models |
| Customer Reviews | 4.7 out of 5 stars 190 Reviews |
| Item Dimensions | 1.77 x 0.79 x 0.13 inches |
| Manufacturer | LeFix |
| Number of Batteries | 1 CR2 batteries required. |
| Recommended Uses For Product | Laptop |
| Reusability | Rechargeable |
| Unit Count | 1.0 Count |
| Voltage | 3 Volts |

## Product Details

- **Number of Batteries:** 1 CR2 batteries required.
- **Brand:** LeFix
- **Battery Cell Composition:** Lithium Manganese Dioxide
- **Battery Capacity:** 250 Milliamp Hours
- **Recommended Uses For Product:** Laptop

## Images

![CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) - Image 1](https://m.media-amazon.com/images/I/41S465nnV2L.jpg)
![CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) - Image 2](https://m.media-amazon.com/images/I/614JOscU-ML.jpg)
![CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) - Image 3](https://m.media-amazon.com/images/I/61PuTTBQCgL.jpg)
![CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) - Image 4](https://m.media-amazon.com/images/I/61SblZPUzXL.jpg)
![CMOS Battery RTC Memory BIOS Battery for DELL Latitude E5440 E5450 E6440 E6420 E7440 E7240,Alien-Ware M18x,M18xR2,14 R1,18 R1,13,17 R2,15 R1,15 R2,17 R3,13 R2,15 R3,17 R4|for Inspiron 4050(Black) - Image 5](https://m.media-amazon.com/images/I/616WV4NbNsL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does this have an adhesive pad?**
A: Yes,it's have the adhesive pad on the other side.

**Q: Is this battery compatible with Dell Inspiron 5567? If not which cmos battery will work?**
A: Is this for a laptop or desktop?

**Q: When was this battery manufacturered?**
A: in 2020 and produced by Maxell in Japan.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Replacement for mini PC battery that failed
*by V***G on May 3, 2024*

My mini PC had one of these that had failed, and it would cause the PC to reset the CMOS on every boot, which would take a minute or two when rebooting rather than the usual 15 seconds. Once I figured out that it was caused by the CMOS backup battery, I found this replacement and it worked perfectly. I can't speak to longevity as I've only had it in the PC for about a month, but I did test it with a multimeter and it had the expected voltage when it arrived.

### ⭐⭐⭐⭐⭐ It's a CMOS battery so...
*by M***K on December 10, 2024*

Whats to review on a CMOS battery... Pro: 1. It plugged in. 2. It worked. 3. Laptops good now Con: now I have to toss the old battery out 🤷

### ⭐⭐⭐⭐⭐ Look at length of wires before purchasing
*by W***W on March 18, 2025*

I'm giving it five stars since it's my fault for not noticing the length of the wires. This battery's wires were too short for my Dell laptop.

## Frequently Bought Together

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-02*