Dell
Dell
Dell RWFFJ Replacement Battery
Laptop BatteriesView on dell.com
- Brand:
- Dell
- Capacity Wh:
- 99.5 Wh
- Nominal Voltage:
- 11.7 V
- Expected Firmware State:
- full_function
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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: 2026-09-22
Dell RWFFJ Replacement Battery Review
Dell RWFFJ replacement battery, an 11.7V 99.5Wh six-cell pack for the XPS 16 9640.
This pack also sits at the common 99.5Wh air-travel threshold, confirmed by iFixit's own teardown listing.
What to check before you buy
Confirm RWFFJ or the alternate J8FK9 code against your existing pack before ordering.
Specifications
| Brand | Dell |
|---|---|
| Battery Model Code | RWFFJ |
| OEM Spare Part Number | J8FK9 |
| Source | OEM |
| Nominal Voltage | 11.7 V |
| Cell Count | 6 |
| Series Configuration | 2S |
| Capacity Wh | 99.5 Wh |
| Capacity Basis | OEM Label |
| Expected Firmware State | full_function |
| Shipping Classification | UN3481 |
| Compatible Models | Dell XPS 16 9640 (Core Ultra 9 185H, RTX 4070, 32GB) |
| Replaces Part Numbers | J8FK9 |
| Source URL | https://www.ifixit.com/products/dell-xps-16-9640-battery |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- XPS 16 9640 owners
Not for
- Other XPS 16 revisions without independent confirmation