Fancy Buying 42Wh WY9DX Battery for Dell Latitude 5420

High-performance 42Wh Li-ion replacement battery compatible with Dell Latitude 14 5420, 15 5520 and Precision 15 3560 series, built to restore reliable portable power.

When your Dell laptop no longer holds a dependable charge, this Fancy Buying 42Wh WY9DX replacement battery is designed to bring back full mobility. It’s a direct-fit, 11.4V Li-ion pack that matches multiple OEM part numbers so you can swap it into Latitude and Precision models without hassle. The pack includes protective circuitry for overcharge, overdischarge, short-circuit and thermal management, and it’s rated for roughly 500 recharge cycles — a practical balance of runtime and lifespan for everyday mobile computing.

How will this battery match my Dell model and part number?

If you’re unsure which cell your laptop accepts, this battery maps to numerous Dell part numbers and model families to simplify compatibility checks. It replaces WY9DX and several factory codes so most Latitude 14/15 and Precision 15 3560 variants are covered.

• Replacement part numbers: WY9DX, P137G, P137G001, P104F, P104F001, P104F002, 1K2CF, 01K2CF, M3KCN, 75X16, 075X16, WK3F1, 005R42, 0WK3F1, 0M3KCN.
• Compatible models: Dell Latitude 14 5420 (CHKFM, FDTCY, XPC5H), Dell Latitude 15 5520 (39V1H, FPKNM), Dell Precision 15 3560 series (multiple SKUs).
• Direct-fit design to swap into original battery bay and connector without modification.

What performance and safety features are built into this pack?

This replacement uses Li-ion cells and an internal management board to protect both battery and laptop. Expect safe charging behavior and reduced risk from common electrical faults when installed correctly.

• Nominal voltage: 11.4V and capacity: 42Wh for balanced energy and weight.
• Protection circuitry for overcharge, overdischarge, overcurrent, short-circuit and temperature control.
• Manufactured to meet OEM-style performance with up to ~500 recharge cycles.

How easy is it to install and what should I prepare?

Installation is straightforward for anyone comfortable opening the laptop’s battery compartment or service panel. Use the correct screwdriver, a static-safe surface, and follow Dell service guidance or a trusted tutorial to avoid damage.

• Power down the laptop and remove AC adapter before replacing the battery.
• Follow OEM disassembly steps for the specific Latitude or Precision model to access the battery bay.
• Reconnect battery cable securely and test power-up before reassembling the case.

What guarantee and support come with this Fancy Buying battery?

Fancy Buying offers straightforward customer care and a warranty window so you can purchase with confidence. If the battery shows manufacturing issues, follow the return or support process stated at checkout.

• 30-day full refund policy and 12-month limited warranty on manufacturing defects.
• Customer support available via the store’s contact tools with response targeting 24 hours.
• Press Ctrl+F on your device page to confirm model/part number matches before ordering.

Who is this for? This replacement battery is aimed at professionals, students and technicians who own a compatible Dell Latitude 14 5420, Latitude 15 5520 or Precision 15 3560 and need an OEM-like swap to restore plug-free runtime. It’s also suitable for IT departments and repair shops that maintain fleets of Dell laptops and require a reliable, cost-effective battery option that includes overcurrent and thermal protections. If your laptop shows reduced battery life, unexpected shutdowns, or a degraded cycle count, this Fancy Buying 42Wh WY9DX pack is a practical replacement to get you back to full productivity.