The BU3120 name covers a generational battery change. Shark explicitly warns that XBTR625KSLN does not fit a BU3120 with an 18V rating or an XBATR525SL/BATR525SLN pack, while its 21.6V/current-pack condition differs.
Manufacturer-listed models
The source names 2 exact model codes for this part. Check the complete suffix on your machine.
- BU3521
- BU3523
Conditional model or variant
| Model or variant | Required check |
|---|---|
| BU3120 | BU3120 has different generations. The manufacturer requires checking the existing battery model and voltage rating. |
Other component types for a shared machine
These source-listed records may be used on the same machine, but they solve different replacement tasks. A filter, wand, dust cup, brush, and floor head are not substitutes for one another.
| Other OEM number | Different component | Shared model example |
|---|---|---|
| 349CH1000 | PowerFins Brushroll | BU3521 |
| XFBU3000 | Auto-Empty System Pre-Motor Filter Assembly | BU3521 |
| 352CH3111C | Duster Crevice Tool | BU3521 |
Before ordering this part
Remove the battery only as the manual directs, read both the pack model and rating label, and compare them with the official battery page. If the labels disagree or cannot be read, stop and ask Shark rather than trying a pack because it attaches.
BU3120 has different generations. The manufacturer requires checking the existing battery model and voltage rating.
Source and purchasing
SharkNinja: Auto-Empty System Battery Pack XBTR625KSLN ↗.
Manufacturer listings can change. Verify your machine label and the current product page before buying.
Use the linked manufacturer source to verify current specifications and availability. We do not show a price or stock claim.