Laptop battery Dell WY9DX 42Wh Lithium-ion for compatible Dell notebooks

Rechargeable 42Wh lithium‑ion battery designed as a compatible replacement for select Dell notebooks. The battery restores portable runtime for everyday mobile tasks such as web browsing, document editing and light office workflows. It supports standard charging circuits and fits into the original battery compartment to provide a compact power source that extends device usability between charges.

Advantages

This 42Wh lithium‑ion battery offers a balance of capacity and weight for typical productivity use. It provides reliable discharge characteristics consistent with notebook power requirements and is designed to work with standard laptop charging systems. The compact form factor and OEM-compatible connectors enable straightforward replacement, while built-in cell protection helps maintain safe operation during normal charging and discharging cycles.

Suitable for

• Replacing a worn or degraded battery in compatible Dell notebook models
• Extending mobile runtime for remote work, study, or travel
• Providing backup power for light office tasks, web browsing and media playback

Key specifications

• Battery chemistry: Lithium‑ion (Li‑ion)
• Rated capacity: 42Wh
• Nominal voltage: typical for notebook lithium‑ion assemblies (refer to device specifications)
• Form factor: compact replacement battery compatible with specified notebook battery compartment
• Connector type: OEM-compatible multi-pin laptop battery connector
• Protection features: internal overcharge, over-discharge and short-circuit protection

How to use

Power off the notebook and disconnect any external power source before replacing the battery. Remove the existing battery following the notebook manufacturer’s service instructions, then install the replacement battery into the compartment until it locks into place. Reconnect the AC adapter and allow the battery to charge fully before first use to calibrate charge indicators. Use the system’s power management settings to monitor battery health and estimated runtime.

Recommendations

Store the battery in a cool, dry place and avoid extreme temperatures. For long-term storage, keep the state of charge at approximately 40–60%. Do not disassemble or puncture the battery. Dispose of used batteries according to local regulations and recycling programs.