ASUNCELL RJ40G 63Wh Laptop Battery for Dell Latitude

ASUNCELL RJ40G is a direct-fit 63Wh lithium-ion replacement battery engineered to restore full runtime for compatible Dell Latitude and Precision laptops.

When your Dell Latitude 14/15 or Precision 15 shows shortened battery life or unreliable charge behavior, swapping the cell pack can be the fastest, most cost-effective fix. This ASUNCELL RJ40G 63Wh battery matches the original battery's voltage and capacity, includes built-in protections against overcurrent and temperature extremes, and is designed to meet the form factor and connector layout of listed Dell part numbers.

Which Dell models and part numbers work with this battery?

This replacement fits several Latitude and Precision series that use the RJ40G-style battery. Confirm compatibility by matching your laptop's existing part number or the battery label before ordering.

• Compatible models: Dell Latitude 14 5420, Latitude 15 5520, Precision 15 3560.
• Common compatible part numbers: RJ40G, 01K2CF, 075X16, WY9DX, 0WK3F1, 0M3KCN, 005R42.
• Be aware: some laptops offer two battery size options (63Wh and 42Wh); choose the size that matches your original pack.

How reliable and safe is the ASUNCELL RJ40G battery?

The RJ40G pack uses lithium-ion cells with integrated safety circuitry to help prevent overcharge, overdischarge, and excessive current draw. It is rated for about 500 recharge cycles under normal use and includes thermal safeguards to reduce risk during charging and operation.

• Voltage and capacity: 15.2V, 63Wh (3941mAh).
• Safety functions: overcurrent, overcharge, overdischarge protection, and temperature control.
• Durability: designed for roughly 500 charge cycles with typical laptop usage patterns.

What should I check before buying and installing this battery?

Double-check your laptop’s current battery label, service tag, or system settings to confirm the part number and battery capacity. Use anti-static precautions and follow Dell’s disassembly guidance or a professional service for safe installation.

• Verify the original battery part number (e.g., RJ40G or WY9DX) and capacity (63Wh vs 42Wh).
• Power off, unplug, and ground yourself before replacing the battery to avoid damage.
• Keep screws and fasteners organized; take photos if needed to ensure correct reassembly.

What warranty and support come with the battery?

ASUNCELL provides straightforward after-sales protection: a 30-day full refund window plus a 12-month warranty. For any problems during the first year, customer support promises a timely response to troubleshoot or arrange a replacement.

• 30-day full refund if the product is unsatisfactory.
• 12-month limited warranty for defects and performance issues.
• Support response typically within 24 hours via the "Ask a Question" contact method.

Who is this for? The ASUNCELL RJ40G 63Wh battery is intended for Dell Latitude and Precision users who need a reliable OEM-style replacement to recover lost runtime without upgrading the entire laptop. It's well suited for professionals, students, and technicians who want a drop-in battery that matches original specifications and includes protections and warranty coverage. If your machine originally shipped with the 63Wh pack and you want consistent voltage and fit with factory behavior, this battery is a practical, budget-friendly replacement option.