Quick facts
WY9DX is a battery that fits 3 laptop models: Dell Latitude 5420, Latitude 5520, Precision 3560. It is also sold as M3KCN, WK3F1, R89GC, 05R42, 0WY9DX.
| Part number | WY9DX |
|---|---|
| Part type | Battery |
| Also sold as | M3KCN, WK3F1, R89GC, 05R42, 0WY9DX |
| Capacity | 42 Wh |
| Voltage | 11.4 V |
| Cells | 3 |
| Last checked | 2026-10-10 |
Compatible models (3)
- Dell Latitude 5420
- Latitude 5520
- Precision 3560
Laptops compatible with WY9DX
Fits 3 laptops: 3 OEM confirmed, 0 seller listed, 0 reported by users.
Also sold as: M3KCN, WK3F1, R89GC, 05R42, 0WY9DX
- Dell Latitude 5420 (Core i5-1145G7, 16GB, FHD)OEM confirmedMatched on: part number WY9DX, listed as Dell Latitude 5420
- Latitude 5520OEM confirmedMatched on: part number WY9DX
- Precision 3560OEM confirmedMatched on: part number WY9DX
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Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Manufacturer: Dell Last updated: 2026-10-10
Dell WY9DX Replacement Battery Review
Dell WY9DX replacement battery, the 42Wh 3-cell 11.4V pack for the Dell Latitude 5420, Latitude 5520 and Precision 3560.
Dell's Latitude 5420 spec sheet lists this 3-cell 42Wh pack as the smaller of two battery options, at 207.9 mm long versus 238 mm for the 4-cell 63Wh pack (Dell RJ40G). Parts-People sells it as the Dell OEM WY9DX and lists M3KCN, WK3F1, R89GC and 05R42 as older codes for the same part.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Latitude 5420 and 5520 owners with the original 42Wh battery
Not for
- Owners who want the longer-running 63Wh RJ40G
Specifications
What these specs mean| Brand | Dell |
|---|---|
| Battery Model Code | WY9DX |
| OEM Spare Part Number | WY9DX, 0WY9DX |
| Nominal Voltage | 11.4 V |
| Cell Count | 3 |
| Series Configuration | 3S |
| Capacity Wh | 42 Wh |
| Capacity Basis | OEM Label |
| Length | 207.9 mm |
| Width | 95.9 mm |
| Thickness | 5.7 mm |
| Compatible Models | Dell Latitude 5420, Latitude 5520, Precision 3560 |
| Replaces Part Numbers | M3KCN, WK3F1, R89GC, 05R42 |
FAQs
Which laptops does the Dell WY9DX battery fit?
The WY9DX is listed for the Dell Latitude 5420 (Core i5-1145G7, 16GB, FHD), Latitude 5520 and Precision 3560. Check the model code printed on your current battery before ordering.
What is the capacity of the WY9DX battery?
The WY9DX is rated at 42 Wh at 11.4 V, 3 cells. Source of the figure: oem label.
Which part numbers does the WY9DX replace?
It is listed as replacing M3KCN, WK3F1, R89GC, 05R42. A battery with any of these numbers on its label is the same part.
Is the WY9DX an original Dell battery?
Yes. The listing is for an original Dell (OEM) battery.