Skip to product information
Techie Compatible Laptop Battery for Dell 3521 / 5421 6C – Inspiron 15 3521 / 17R 5721 / Latitude 3440 / Vostro 3445

500+ verified 5-star reviews for Jupiter IT Experts

Sale price  Rs. 1,659.00 Regular price  Rs. 2,399.00 30% OFF · Save Rs. 740.00

Taxes included. Shipping is calculated at checkout.

CE, RoHS & UL certified.
1-Year Replacement Warranty
100% Compatible
Easy Self-Installation
In stock
Plug & Play Installation
Fast & Free shipping
1 years warranty
Plug & Play Installation
Plug & Play Installation
Fast & Free shipping
1 years warranty
Plug & Play Installation
Free Shipping

Free Shipping

On orders over ₹1499

Expert Support

Expert Support

Contact us anytime

Secure Payment

Secure Payment

100% secure transactions

Easy Returns

Easy Returns

14-day return policy

Questions about this product? Contact us

Product Details

Reliable Power. Restored Performance.

Restore dependable battery performance to your Dell laptop with the Techie Compatible 6-Cell Laptop Battery for Dell 3521 / 5421 Series, designed for select Dell Inspiron, Latitude, and Vostro laptops including Inspiron 15 3521, Inspiron 17R 5721, Latitude 3440, and Vostro 3445 models. Built using high-quality lithium-ion cells, this battery delivers stable output and reliable backup for everyday computing tasks.

Engineered to match the original Dell battery’s form factor and electrical specifications, it ensures seamless installation and consistent performance with compatible systems. Integrated safety protection circuits help guard against overcharging, overheating, and short circuits, supporting both device safety and long-term battery reliability.

If your original battery has degraded or no longer holds charge efficiently, this compatible replacement provides a practical and cost-effective way to restore your laptop’s mobility and productivity.

Specifications

Category

Details

Model

Techie Compatible Laptop Battery for Dell 3521 / 5421 Series

Compatible Part Number

0MF69, 24DRM, 312-1387, 312-1390, 312-1392, 49VTP, 4DMNG, 4WY7C, 6HY59, 6KP1N, FW1MN, MR90Y

Compatible Laptop Series

Dell Inspiron, Latitude, and Vostro Series

Compatible Models

Inspiron 15 3521, Inspiron 17R 5721, Latitude 3440, Vostro 3445

Battery Type

Lithium-Ion (Li-ion)

Number of Cells

6-Cell

Voltage

11.1 V

Capacity

4400 mAh

Energy

~48.8 Wh

Safety Features

Over-charge protection, Over-discharge protection, Short-circuit protection, Thermal protection

Safety certification

BIS, CE, RoHS, and UL Certified

Condition

Brand New Replacement Battery

Weight

~420 g

Dimensions

30 × 8 × 8 cm

Warranty

12-Month Replacement Warranty

Key Features
  • Reliable Lithium-Ion Power: Built with 6 high-quality Li-ion cells delivering 11.1 V voltage and 4400 mAh capacity (~48.8 Wh), providing stable and dependable power for daily laptop use.
  • Advanced Safety Protection: Integrated protection systems help prevent over-charging, over-discharging, short circuits, and overheating for safe and reliable operation.
  • Certified Quality & Compliance: Manufactured to meet international safety standards and certified by BIS, CE, RoHS, and UL for dependable performance.
  • Wide Compatibility: Designed as a compatible replacement for Dell Inspiron 15 3521, Inspiron 17R 5721, Latitude 3440, and Vostro 3445 laptops.
  • Warranty & Easy Replacement: Includes a 12-Month Replacement Warranty along with a 14-day return or replacement window if required

Product details 

Techie Compatible for When your laptop battery no longer holds charge or struggles to power your device, a quality replacement makes all the difference. The Techie compatible laptop battery is engineered to restore performance and dependable backup.

  • 0-Cycle Technology: Harness the power of 0-cycle cells, with each cell brand new and ready to deliver reliable performance from your very first use.
  • Top-Quality Cells: Techie stands for excellence. Our battery integrates the most efficient capacity cells, ensuring unwavering and dependable power throughout its lifespan.
  • Safety Features: Your safety is our priority. Our battery comes with built-in protections against overcharging, overheating, and short-circuiting, ensuring your laptop and data stay secure.
  • Extended Longevity: Say goodbye to frequent battery replacements. Our battery boasts an extended lifespan compared to standard laptop batteries, keeping you powered for longer.
  • Enhanced Performance: Experience a new level of laptop performance and power efficiency. Our battery optimizes power delivery, ensuring seamless multitasking and smoother operations.

Techie replacement batteries are engineered for consistent performance and reliability, ensuring your laptop gets the dependable power it was designed for

Quality Assuarance

We know battery safety matters. That’s why every battery is built to meet strict international safety standards and is thoroughly tested before it reaches you.

  • CE Certified – Meets European safety and quality standards
  • RoHS Compliant – Free from hazardous materials
  • UL Certified – Tested for electrical safety and reliability
  • 100% Factory Tested and Built with protection against overcharge, overheating, and short circuits

So you can use your laptop with complete peace of mind — no risks, no compromises.

Shipping & Returns

Shipping

  • Free shipping available on all orders over ₹1499.

    All orders are processed within1–3 business days(excluding weekends and holidays)

    For more details, please refer to our Shipping Policy here.

Returns & Refunds

  • We have a 14-day return policy, which means you have 14 days after receiving your item to request a return. 

    To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

    For more details, please refer to our Refund Policy here.
How to claim warranty?

We’ve made the warranty process simple and hassle-free.

If you face any issue with your battery:

  1. Contact our support team via WhatsApp or email with your order details
  2. Share a short description of the issue (photos/videos if needed)
  3. Our team will verify and guide you through the next steps
  4. Once approved, you’ll receive a replacement unit quickly

We’re here to make sure you’re never stuck with a faulty product.


Beyond Warranty — We’ve Got You Covered


Even beyond warranty claims, we provide end-to-end repair support—something most sellers don’t offer.

From minor fixes to full refurbishments, we deliver:

• Affordable repair solutions
• High-quality parts & service
• Tailored fixes based on your needs

Click to Learn more

Trusted by over 40,000 customers since 2009.

What’s Inside Every Tested Battery

Timeline logo

*Cell Selection

We use tested Grade-A lithium cells with stable voltage output and longer cycle life

*Protection Circuit Testing

Each battery includes safeguards against overcharging, overheating, and short circuits.
and comes with CE, RoHS & UL certified.

*Capacity Verification

Every unit is tested for proper capacity and charge retention before dispatch

*Compatibility Check

We verify connector type, voltage, and fitment for supported laptop models

*Ready to Install

Simple plug & play install with support available if needed

Don’t Know if Your Laptop is Compatible?

Send us your laptop model or old battery part number on WhatsApp and we’ll confirm compatibility for you.

Check Compatibility on WhatsApp

Not Sure What to Search?

Check your laptop model on the back label or old battery.

Laptop Bottom Label

Old Battery Label

Everything You Need in a Replacement Battery

Jupiter IT Experts
Other sellers OEM Service Center
Tested Before Dispatch
CE, RoHS & UL Certified Limited
Exact Compatibility Support Limited
Battery Health & Safety Checked Limited
Better Pricing
Easy Replacement Support Limited Limited
Fast Pan-India Delivery Limited

Not All Replacement Batteries Are the Same

Cheap marketplace batteries often prioritize low pricing over reliability, safety checks, and compatibility verification.

We focus on tested compatibility, stable performance, and dependable after-sales support.

Why Customers Choose Batteries from us ?

Tested Before Dispatch

Every supported battery is checked for charging behavior, connector fitment, and stable power delivery before shipment.

Better Compatibility Verification

We help reduce compatibility issues by verifying supported laptop models, connector types, and battery specifications.

Safer Internal Protection

Protection circuitry and thermal safeguards help reduce risks associated with unstable low-quality batteries.

Support After Purchase

Unlike many marketplace sellers, assistance doesn’t stop after delivery if you need compatibility or installation help.

Better Long-Term Value

A properly tested battery can help avoid premature failures, charging instability, and unnecessary replacement costs.

Inside Every Battery We Sell

Every battery is engineered with intelligent power management, tested lithium-ion cells, and built-in protection systems designed for stable performance, safer charging, and long-term reliability.

Jupiter Battery Internal Xray View

Smart BMS Protection

The integrated Battery Management System continuously regulates voltage, charging behavior, and power delivery to help protect against overheating, overcharging, and short circuits.

High-Density Lithium Cells

Premium lithium-ion cells are selected for stable backup, improved charging efficiency, and longer cycle life during everyday usage.

Precision Connector Pins

Precision-aligned connector pins help ensure secure fitment, stable power transmission, and accurate compatibility with supported laptop models.

Thermal Protection Layer

Built-in thermal safeguards help regulate internal temperatures during prolonged charging and heavy workloads, improving long-term battery stability.

FAQs

Will this damage my laptop ?

No — compatible batteries are selected based on supported voltage, connector type, and fitment requirements to help ensure safe and stable everyday use.

How do I check compatibility ?

If you’re unsure, send us a photo of your existing battery or your laptop model on WhatsApp and we’ll help verify compatibility before purchase

Is installation difficult?

Most laptop batteries can be replaced using basic tools and simple steps.

Some models are easier than others. If needed, our team can help guide you during installation after purchase.

What if my laptops arrive damaged ?

It’s extremely rare, as each device is carefully tested and securely packaged before shipping.

If it does happen, simply contact us right away and we’ll ensure a fast replacement or resolution.

How long does the battery last?

Battery backup depends on your laptop model, usage, screen brightness, applications running, and battery capacity.

For most users, the battery is suitable for everyday work, study, browsing, and regular portable use.

How many charge cycles can I expect?

Battery lifespan varies depending on usage habits and charging conditions.

With proper use, most quality lithium-ion laptop batteries are designed to handle hundreds of charge cycles before noticeable capacity reduction.

Is this fake?

No. We focus on tested compatible replacement batteries designed for supported laptop models.

Each battery is checked for compatibility, charging behavior, and stable performance before dispatch.

What happens if I buy the wrong one?

If you're unsure, we strongly recommend confirming compatibility with us before ordering.

In case of compatibility issues, contact our support team and we’ll help guide you through the next steps.

Will it fit?

Fitment depends on your laptop model and battery part number.

We recommend matching both whenever possible. If you need help, send us your battery photo or laptop model on WhatsApp for compatibility verification.

You may also like