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Rectangular black lithium-ion battery pack, four cells, 63Wh capacity

DELL RJ40G 4-Cell 63Wh Laptop Battery 15.2V

SKU CH-3Z7R-D3RVY

Replacement 4-cell 63 Wh lithium-ion battery at 15.2 V for Dell Latitude 5420, 5520 and Precision 3560 series

  • Battery type96 W
  • Battery voltage rating20 V
  • Power adapter voltage20 V
  • Measurements14.33 in W × 12.83 in H × 9.06 in D
  • Product typeCharger
  • Compatible withRJ40G M3KCN 75 × 16 WY9DX 1K2CF WK3F1 01K2CF 075 × 16 0WK3F1
  • Fits Dell Latitude 5420, 5520 and Precision 3560 models
  • 63 Wh capacity gives longer runtime than 42 Wh alternatives
  • 4-cell lithium-ion design delivers stable 15.2 V power
  • Brand-new condition ensures full performance from first charge
  • 200 g weight keeps laptop portable for travel

Dell RJ40G 4-Cell 63Wh Battery

This new lithium-ion battery replaces the original power cell in compatible Dell Latitude and Precision laptops. It delivers 15.2 volts and 63 watt-hours from a four-cell design. The unit weighs 200 grams and measures 14.33 by 12.83 by 9.06 inches. It is built for users who need a direct-fit replacement for a worn or failed factory battery.

Who This Suits And Who It Does Not

The battery fits Latitude 14 5420, Latitude 15 5520 and Precision 15 3560 models that originally used the RJ40G or listed part numbers such as P137G, P104F, 075X16, WY9DX, 1K2CF or WK3F1. Buyers whose machines shipped with the 42Wh three-cell WY9DX version cannot use this pack. Anyone needing a charger or AC adapter should look elsewhere because this item is a battery only.

The Deciding Specification

The critical figure is the 63Wh capacity paired with the RJ40G part number. Dell uses two physically different batteries in the same laptop series, so the original battery label must read RJ40G or 63Wh before ordering. A 42Wh three-cell unit will not fit the bay designed for this four-cell pack.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $62.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameDELL
Model nameRJ40G
Part numberRJ40G
Product typeCharger
Power
Battery type96 W
Battery voltage rating20 V
Power adapter voltage20 V
Size & build
Measurements14.33 in W × 12.83 in H × 9.06 in D
Product weight200 g
Compatibility
Compatible withRJ40G M3KCN 75 × 16 WY9DX 1K2CF WK3F1 01K2CF 075 × 16 0WK3F1 0M3KCN 005R42 M033 W

Questions about this item

Will the 4-cell lithium-ion pack need replacement after a certain number of charge cycles?

The 63Wh battery is rated for hundreds of cycles; capacity will gradually decline, so plan a swap when runtime drops below your needs.

What limits runtime first during a full day of work on this 15.2V 3941mAh battery?

The 63Wh capacity sets the ceiling; heavy CPU or GPU load will drain it faster than light tasks.

Does the 200g battery get hot or draw extra power when the laptop runs all day?

Normal operation keeps the pack at safe temperatures; the 15.2V design matches the original thermal profile.

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