MYLAP Laptop Battery for Dell Inspiron 3521, XCMRD, 3542, 15 3537, 15R 5521, 15R 5537, 15 3542, 3543, Latitude 3440, 3540, E3440 – Type MR90Y, P28F, P40F – 6 Cell

Mylap Laptop Battery – Unleash Limitless Power & Reliability Revive Your Dell Laptop with Outstanding Power & Performance Is Your Dell Laptop Struggling with Battery Issues?If your Dell Inspiron 3521, 3542, 3537, or Latitude 3440 laptop is facing unexpected shutdowns, rapid battery drain, or slow charging, it’s time to switch to the Mylap Dell 3521 Battery. Our premium-quality replacement battery ensures your laptop stays powered, productive, and protected. Built with premium-grade lithium-ion cells, advanced safety features, and extended battery life, the Mylap 3521 Battery ensures your laptop stays powered whether you're working, studying, or streaming. ✅ 100% Compatibility with HP Laptops – No BIOS errors, no compatibility issues.✅ Premium Li-ion Cells – Ensures stable power output for uninterrupted performance.✅ Up to 500 Recharge Cycles – Lasts longer than standard laptop batteries.✅ Enhanced Safety Features – Overcharge, overheat, and short-circuit protection.✅ Quick & Easy Installation – Plug-and-play replacement for hassle-free use.✅ Fast & Free Delivery – Get your battery delivered quickly at no extra cost.✅ 1-Year Replacement Warranty – Peace of mind with hassle-free replacement.✅ Cash on Delivery Available – Pay when you receive your order.✅ Dedicated After-Sales Support – Expert assistance for installation and troubleshooting.✅ 10-Day Easy Return Policy – Shop with confidence, risk-free! Next-Generation Power Technology for Maximum Performance Extended Battery Backup – Delivers 2.5 to 4 hours of uninterrupted usage for work and entertainment. Battery backup may vary based on usage and settings.High-Capacity Power – Ranges from 4000mAh, providing long-lasting energyOptimized Voltage & Stability – Operates at 11.1V, ensuring steady performance and preventing sudden shutdowns.Premium Li-ion Cells – Built with 6 high-quality lithium-ion cells for efficient and stable power delivery.500 Charge Cycles – 0-Cycle Technology guarantees full capacity from the first charge, enhancing battery lifespan.Advanced Li-ion Technology – Reduces self-discharge, improves power efficiency, and extends overall battery life.Fast Charging & Efficient Power Management – Supports quick charging while minimizing power wastage for enhanced productivity.Seamless Compatibility & Easy Installation – Perfect fit for HP laptops, ensuring a secure and stable connection without modifications. Upgrade Your Laptop’s Battery Life! Don’t let power issues slow you down! Say goodbye to sudden shutdowns, slow charging, and battery drain. The Mylap Dell 3521 Battery is designed to deliver long-lasting backup, rapid charging, and uncompromised performance long-lasting backup and efficient power management. More Power – Stay productive for hours without interruptions.More Efficiency – Smart energy management for optimal battery life.More Reliability – Premium quality cells ensure stable power output.Your laptop deserves the best—Choose Mylap!  Multi-Layered Safety Protection Your laptop’s safety is our priority. The Dell 3521 Battery  comes with a smart Battery Management System (BMS) to prevent:✅ Overcharging & Overheating – Extends battery life while keeping your laptop safe.✅ Short-Circuit Protection – Prevents electrical faults and sudden shutdowns.✅ Voltage Surge Protection – Ensures consistent power without fluctuations.✅ Battery Balancing Technology – Enhances overall performance and longevity. Specification Battery Type: Lithium-ion Capacity 4000mAh Voltage 11.1V Watt-hour 44Wh Cell Configuration 6 Cells Overcharge Protection Yes Short-circuit Protection Yes Overheating Protection Yes Intelligent Power Management Yes RoHS Compliance Yes CE & FCC Certified Yes Weight 410 Grams Dimensions 26.8 x 50.7 x 272.2 MM Color Black Built for Durability & Daily Reliability Seamless Compatibility with Dell LaptopsThe Mylap Dell 3521 Battery is 100% compatible with: Dell Inspiron 3521, 3542, 3537, 5421, 5521, 3440, 3421, Latitude 3440, and more.Fully compatible with Dell battery models: XCMRD, MR90Y, 40Wh XCMRD 14.8V, and more.  Note: Before purchase, check your existing battery model for perfect compatibility! ​ At Mylap, we don’t just sell batteries – we build lasting relationships. We understand the importance of reliable support after your purchase. That’s why we offer:�� 24/7 Customer Assistance – Got questions? Need troubleshooting? We’re always here.�� Hassle-Free Replacements – Our 1-Year Replacement Warranty ensures complete peace of mind.�� Easy Returns – Enjoy a 10-day return policy with no stress.⚡ Fast & Free Shipping – So you get your battery when you need it the most.�� Technical Support from Experts – Get guidance on installation, performance optimization, and care tips. Mylap’s dedicated after-sales team ensures that your laptop stays powered for years to come. Your trust is our success! Compatible Part Numbers Part Numbers Part Numbers Part Numbers Part Numbers 0MF69 Battery24DRM Battery312-1387 Battery312-1390 Battery312-1392 Battery312-1433 Battery451-12107 Battery451-12108 Battery49VTP Battery 4DMNG Battery4WY7C Battery68DTP Battery6HY59 Battery6K73M Battery6KP1N Battery6XH00 Battery8RT13 Battery8TT5W Battery 9K1VP BatteryDJ9W6 BatteryFW1MN BatteryG019Y BatteryG35K4 BatteryMK1R0 BatteryMR90Y BatteryN121Y BatteryPVJ7J Battery T1G4M BatteryV1YJ7 BatteryV8VNT BatteryVR7HM BatteryW6XNM BatteryX29KD BatteryXCMRD BatteryXRDW2 BatteryYGMTN Battery Compatible Model Numbers Model Number Model Number Model Number Model Number Dell Inspiron 14 (3421) Battery Dell Inspiron 14R (5421) Battery Dell Inspiron 14R (5437) Battery Dell Inspiron 15 (3521) Battery Dell Inspiron 15R (5521) Battery Dell Inspiron 15R (5537) Battery Dell Inspiron 15 (3537) Battery Dell Inspiron 15 (3542) Battery Dell Inspiron 15 (3531) Battery Dell Inspiron 15 (3541) Battery Dell Inspiron 17 (3721) Battery Dell Inspiron 17R (5721) Battery Dell Inspiron 17R (5737) Battery Dell Inspiron 17 (3737) Battery Dell Inspiron 17 (5748) Battery Dell Inspiron 17 (5749) Battery Dell Latitude 3440 Battery Dell Latitude 3540 Battery Dell Vostro 2421 Battery Dell Vostro 2521 Battery Dell Inspiron 15 (3543) Battery Order now and experience the difference!Enjoy 1-Year Replacement Warranty, 10-Day Easy Return, Free & Fast Delivery, and 24/7 Dedicated After-Sales Support!