Mobik RJ40G 63Wh Laptop Battery for Dell Latitude 15/14

The Mobik RJ40G is a 63Wh (15.2V, 3941mAh) lithium-ion replacement battery built to restore full runtime to compatible Dell Latitude 14/15 and Precision 15 laptops.

If your Dell Latitude 5420, 5520 or Precision 3560 no longer holds charge, the Mobik RJ40G offers a direct-fit replacement that matches original voltage and capacity. Designed to comply with common safety standards and to fit the listed part numbers, this battery is intended to return your laptop to reliable portable use without the premium price of OEM parts.

How do I know this battery will fit my laptop?

The RJ40G is made to match the size, connector and mounting points used by the specified Dell models and part numbers (for example M033W, 01K2CF, 075X16 and WY9DX). Check your existing battery labels for matching part numbers and 15.2V/3941mAh specs before ordering. If the part numbers on your original battery match any listed, the Mobik RJ40G is a compatible swap.

• Physical form factor tailored for Latitude 14 5420 and Latitude 15 5520.
• Compatible with Precision 15 3560 series mounting and connector.
• Replaces OEM part numbers such as P137G/P104F and 0WK3F1/0M3KCN.

What runtime and cycle life can I expect from this replacement battery?

Rated at 63Wh and 3941mAh, the RJ40G delivers runtime similar to the original factory cell under equivalent workloads. Constructed with lithium-ion cells tested for durability, it supports up to roughly 500 recharge cycles before notable capacity decline, depending on use and charging habits.

• 63Wh capacity for standard office, browsing and video playback time.
• Approximately 500 charge cycles with normal charging patterns.
• Performance varies based on CPU load, screen brightness and peripherals.

Is the Mobik RJ40G safe to use and does it meet regulations?

Safety is a priority: the RJ40G is manufactured and tested to meet widely recognized safety standards. It carries certifications such as UL, CE, FCC and RoHS, which indicate compliance with electrical safety, emissions and hazardous-material restrictions. Still, follow manufacturer and laptop safety guidelines when installing and charging the battery.

• UL and CE certification for electrical safety compliance.
• FCC compliance for electromagnetic emissions.
• RoHS restricted-substance compliance for environmental standards.

How easy is installation and what should I prepare?

Installation is straightforward for users comfortable opening the laptop’s access panel. Power down and unplug the laptop, remove the back cover or battery bezel, disconnect the old battery and swap in the RJ40G, then reassemble. If you prefer, a qualified technician can perform the swap to avoid warranty or handling concerns.

• Power off and unplug before beginning replacement.
• Use small Phillips screwdriver and an anti-static surface if available.
• Confirm BIOS recognizes battery after installation; a quick calibration is recommended.

Who is this for: The Mobik RJ40G is intended for laptop owners, IT departments and repair shops needing a cost-effective, direct-fit battery for Dell Latitude 14 5420, Latitude 15 5520 and Precision 15 3560 systems. It’s suitable for users seeking to restore daily portability, extend device life, or keep spare batteries on hand for travel or field work. For mission-critical use or specialized warranty concerns, consult your service provider before replacement.

• Battery Capacity: 63Wh / 3941mAh, 15.2V lithium-ion cells
• Compatible Models: Dell Latitude 14 5420, Latitude 15 5520, Precision 15 3560
• Safety Certified: UL, CE, FCC, RoHS
• High Reusability: Up to ~500 recharge cycles
• Reliable Performance: Quality control and standards compliance