⚠️ IMPORTANT BUYING NOTICE:

• WY9DX Standard 3-Cell Configuration: This professional-grade 11.40V Lithium-Polymer (Li-Polymer) internal replacement battery pack features a highly compact, thin-layer layout measuring exactly 214.80 x 103.00 x 5.80 mm and weighing a lightweight 164.00 g. It drops completely flat into the lower chassis compartment of your laptop without causing outer frame bulging, uneven casing tension, or internal trackpad click resistance.

• Capacity & Voltage Verification (Crucial Rule): Please note that this is the standard 42.00 Wh (3-cell) configuration module under part numbers WY9DX or 005R42. Do not confuse it with the larger RJ40G (63Wh / 4-cell) battery module. While both versions are compatible with the same laptop models, they feature entirely different operational physical lengths and voltages (11.4V vs 15.2V). You must verify your original battery's print to ensure a correct layout match.

• Compatibility Verification: Before completing your purchase, please unscrew your laptop's bottom plate to verify that your original factory battery displays a native operational voltage rating of 11.4V and explicitly matches part numbers WY9DX or 005R42.
  
  

⚡ CONTINUOUS VOLTAGE DELIVERY & ENTERPRISE PERFORMANCE RESTORATION: Bring back the full mobile efficiency and all-day wireless performance of your workstation with this premium, brand-new replacement internal Li-Polymer battery. Specifically engineered around a stable 11.40V power circuit and packed with a reliable capacity of 3680 mAh (42.00 Wh), this battery ensures a steady, clean flow of current during demanding multi-tasking, computational processes, and daily corporate workloads. It serves as an immediate drop-in solution to correct common hardware aging anomalies, such as swift battery drain, unexpected performance drops under processing loads, erratic percentage indicators, or a total refusal to power on without the original AC charger attached. Built with an on-board intelligent protection microchip array, it continuously safeguards your premium system investment from over-charge, over-discharge, shorted electrical loops, and extreme thermal shifts.

Compatible Original Part Numbers: WY9DX, 005R42

Comprehensive Laptop Compatibility List:

Dell Latitude Commercial Business Systems

• Dell Latitude 14-Inch Workstations: Latitude 14 5420
  
  

• Dell Latitude 15-Inch Desktop Mainstays: Latitude 15 5520

Disclaimer: The batteries and other products supplied by our Company are [replacement for] sold for use with certain products of computer manufacturers, and any reference to products or trademarks of such companies is purely for the purpose of identifying the computers with which our products [are replacement for] may be used. Our Company and this Website are neither affiliated with, authorized by, licensed by, distributors for, nor related in any way to these computer manufacturers, nor are the products offered for sale through our Website manufactured by or sold with the authorization of the manufacturers with which our products [are replacement for] may be used