The HP Pro X2 Probook 440 uses a lithium-ion battery in this category’s 10.68 to 19.0 volt range, with capacity from about 38 to 98 Wh depending on the exact build. Common matching part numbers across this line include HSTNN-DB9Q and HSTNN-LB6K. Because the Probook 440 shipped in several configurations over multiple years, the correct pack depends on your specific unit. Check the label on your current battery and match the part number directly. Replacement prices in this category run from $34.99 to $54.99.

Match the part number printed on your existing battery, which is the most reliable method. The HP Pro X2 category covers 80 distinct part numbers across roughly 1374 models, so the exact identifier matters. Look for codes like HSTNN-DB9Q, HSTNN-Q96C, or 3ICR19/65-2 on the battery label or inside the battery bay. You can also confirm your full model name, often printed on the back of the unit, then cross-reference voltage (10.68 to 19.0 V) and capacity (38 to 98 Wh) to be sure.

HP Pro X2 replacement batteries in this category run from $34.99 to $54.99. The price depends on the specific sub-series, the cell count, and the capacity, which spans about 38 to 98 Wh across the line. A lower-capacity 2-cell pack typically sits at the lower end, while higher-Wh packs land toward the top. Matching your exact part number, for example HSTNN-LB6K or HSTNN-I66C-5H, ensures you pay for the correct capacity rather than guessing.

No, HP Pro X2 batteries are not broadly interchangeable. With 80 distinct part numbers covering this line, voltage and capacity differ significantly, ranging from 10.68 to 19.0 volts and 38 to 98 Wh. An earlier G1 detachable using a 4-cell pack like KK04XL will not accept a 2-cell SE04XL from a slimmer G2 unit. Always confirm the part number on your current battery, such as HSTNN-DB9Q or HSTNN-Q96C, before ordering a replacement.

The main differences are voltage, capacity, cell count, and physical fit across sub-series like the Probook 440, 640, 450, 430, and 650. Voltage spans 10.68 to 19.0 V and capacity ranges from about 38 to 98 Wh, so a 2-cell pack rated around 41 Wh in one model will not match a higher-capacity multi-cell pack in another. Part numbers such as 3ICR19/65-2 and HSTNN-W42C-A-B map to specific configurations, which is why matching your exact model is necessary.

Look on the label of your current battery first, where codes like HSTNN-DB9Q, HSTNN-LB6K, or SE04XL are typically printed. On detachable HP Pro X2 units, the model name is often on the back of the tablet, and the battery identifier may appear inside the battery bay once the panel is opened. You can also check your original documentation. With 80 part numbers in this category, the printed code is the surest way to match the right replacement.

Yes, most HP Pro X2 batteries can be replaced yourself, though the process varies by sub-series. Some models use an accessible battery bay or panel for a quick swap, while detachable units may require opening the back to reach an internal pack. Confirm your part number first, for example HSTNN-Q96C or HSTNN-I66C-5H, then power down and disconnect the old battery before seating the new one. Take your time aligning the connector and securing any screws or panels.

Watch for sharply reduced runtime, the unit shutting off well before reaching zero percent, or the battery refusing to hold a charge. You may also see the charge level stick at a fixed number or drain unusually fast under light use. These signs point to a worn lithium-ion pack rated in this category’s 38 to 98 Wh range. Confirm your part number, such as HSTNN-DB9Q or 3ICR19/65-2, and plan a replacement priced between $34.99 and $54.99.