It depends on the exact 15 model, since this sub-series spans many years and several part numbers. Older Pavilion 15-au units take a BP02XL pack, while newer 15-eg units use HW03XL. Across the line voltage runs from 7.4 to 15.4 volts and capacity from about 29 to 95 Wh, in 3-cell or 6-cell lithium-ion form. Check the part number printed on your current battery, such as HSTNN-LB6K, and match it to confirm the correct replacement for your specific Pavilion 15.

Start with your full model suffix, found on the label on the bottom of the laptop (for example Pavilion 15-eh versus 15-cs), since batteries differ between those variants. Then open the laptop or check your existing pack for its part number, such as HSTNN-LB5Y or HP484170-001. Matching both the model and the part number avoids ordering a battery with the wrong voltage or fit. With 141 part numbers covering this line, that exact match is what guarantees compatibility.

HP Pavilion replacement batteries range from $34.99 to $81.99. Where your battery falls in that range depends on cell count and capacity, since packs run from about 29 Wh in compact 3-cell designs up to roughly 95 Wh in larger 6-cell configurations. A smaller Pavilion 14 internal battery sits toward the lower end, while a high-capacity 15 or 17 pack sits higher. Confirm your part number, such as HSTNN-DB7K, to see the exact price for your model.

No, not across the line. The HP Pavilion family uses 141 distinct part numbers spanning 7.4 to 15.4 volts and 29 to 95 Wh, so a battery from one sub-series rarely fits another. Even within the same size, a Pavilion 15-au (BP02XL) and a 15-eg (HW03XL) take different packs. Voltage and physical connector differences mean you must match your exact model and part number, like HSTNN-LBY5BV, rather than assuming any Pavilion battery will work.

The main differences are size, cell count, and whether the battery is internal or removable. Older Pavilion 6000 and 2000 models use external 6-cell or 12-cell packs that latch out, while modern Pavilion 14, 15, 17, and x360 models mostly use internal lithium batteries that require removing the bottom panel. Capacity also varies, from about 29 Wh in slim 3-cell designs to roughly 95 Wh in larger packs. Part numbers like HSTNN-C82C and HSTNN-LB6K reflect these generation and size differences.

The part number is printed on a label on the battery itself, shown as a code like HSTNN-LB6K or HP484170-001. On older models with a removable pack, slide the battery out and read the label directly. On modern Pavilion 14, 15, and x360 models with internal batteries, you remove the bottom panel to view it. You can also cross-reference your laptop model suffix, found on the underside of the chassis, against the matching part number.

Yes, in most cases. Older Pavilion 2000 and 6000 models have a removable pack that releases from the bottom with a latch and no tools. Modern Pavilion 14, 15, 17, and x360 models use internal batteries, so you remove the bottom panel screws, disconnect the battery cable, and swap the pack. Match the part number first, such as HSTNN-LB5Y, and confirm the voltage (commonly 7.4 to 15.4 volts) so the replacement seats and connects correctly.

Common signs include the laptop shutting off well before the charge indicator reaches zero, runtime dropping to a fraction of what it once was, and the system staying tethered to power to run at all. You may also see the battery stuck at a fixed percentage or reporting a low health reading in Windows. When a 95 Wh pack behaves like it holds only a small share of its rated capacity, it is time to match your part number, such as HSTNN-DB7K, and replace it.