The Probook 440 uses an internal lithium-ion pack, frequently a 3-cell unit in the 38 to 50 Wh range, with voltage that falls within the wider 10.68 to 19.0 V span across this line. Exact part numbers vary by generation, so the same Probook 440 name can map to different batteries depending on the year. Common part numbers seen across the Pro X360 family include HSTNN-DB9Q and HSTNN-LB6K. Always confirm the number printed on your current battery before ordering, since a close match by name is not enough.

Match three things: your full model number, the part number printed on your current battery, and the cell count. The Pro X360 catalog has 80 distinct part numbers across about 1374 models, so the series name alone will not identify the correct pack. Flip the laptop over and read the label on the battery or the underside, looking for a code like HSTNN-DB9Q or 3ICR19/65-2. With that number and your model number, you can confirm a battery rated within the 10.68 to 19.0 V and 38 to 98 Wh ranges that fits your machine.

Replacement batteries for the HP Pro X360 line range from $68.99 to $87.99. Where your specific battery falls depends on capacity and cell count, since packs in this line span about 38 to 98 Wh in lithium-ion configurations. Higher-capacity units toward the top of the range generally sit at the upper end of the price band. To get the exact price, match your model number and the part number on your current battery, such as HSTNN-LB6K, so you are pricing the pack that actually fits.

No, they are not broadly interchangeable. This line covers 80 distinct part numbers across about 1374 models, with voltages from 10.68 to 19.0 V and capacities from 38 to 98 Wh, so packs differ by sub-series and generation. A battery from a Probook 640 will not necessarily fit a Probook 440 even though both share the Pro X360 name. The safe approach is to match your exact model number and the part number on your existing battery, like HSTNN-DB9Q, rather than assuming any Pro X360 pack will work.

The sub-series differ mainly in capacity, cell count, voltage, and physical size. Smaller chassis like the Probook 430 use compact lower-capacity packs, while larger enterprise bodies like the Probook 650 fit higher-capacity units, with the overall line spanning 38 to 98 Wh and 10.68 to 19.0 V. Generation also matters, since the same sub-series name can use different part numbers year to year. That is why part numbers such as HSTNN-Q96C and 3ICR19/65-2 are tied to specific models rather than a whole sub-series.

The part number is printed on a label on the battery itself, and often on the underside of the laptop near the model information. Look for a code formatted like HSTNN-LB6K, HSTNN-I66C-5H, or 3ICR19/65-2. Because these Pro X360 packs are internal, you may need to open the bottom cover to read the label directly on the battery. You can also check the original packaging or any prior replacement invoice. Match that exact number against your model to confirm you have the correct pack among the 80 in this line.

Yes, in most cases. The Pro X360 sub-series use internal lithium-ion packs, so replacement involves removing the bottom cover, disconnecting the battery cable, and unscrewing the pack before fitting the new one. You will need a small screwdriver and a careful hand with the connector. Power down and unplug the laptop first. Before you start, confirm the part number, such as HSTNN-DB9Q, matches your machine, since the line includes 80 distinct numbers and the wrong-sized pack will not seat correctly inside the chassis.

Watch for sharply reduced runtime, a charge that drops suddenly or stalls at a set percentage, the laptop shutting off when unplugged, or a battery health reading well below its original capacity. Since these packs are lithium-ion rated up to about 98 Wh when new, a noticeable drop in how long you get on a charge is the clearest signal. If the system warns you to consider replacing the battery, that is your cue. Confirm your model and part number, like HSTNN-LB6K, then order a matching replacement in the $68.99 to $87.99 range.