It depends on the exact generation, since the Elitebook spans many years and sub-series. Common part numbers across the line include 804175-1B1, HSTNN-DB9Q, 687517-2C1, and HSTNN-IB9J, with voltages from 7.7 to 19.0 V and capacities from about 42 to 98 Wh. Early models often used removable external packs, while G3 and later use internal lithium-ion batteries. Find your full model name and generation (for example, EliteBook 840 G5) to match the correct part number.

Match your exact model name and generation, then confirm the printed part number. The line covers about 1062 compatible models across 70 distinct battery part numbers, so an EliteBook 840 G1 and an EliteBook 820 G3 take different packs. Look for the full model on the bottom of the laptop (for example, EliteBook 850 G6) plus the Product Number, then cross-check against part numbers like HSTNN-DB9Q or 687517-2C1. Voltage runs 7.7 to 19.0 V, so matching prevents a wrong fit.

HP EliteBook replacement batteries are priced at $68.99 in this category. That single price covers the full range of sub-series, including the 840, 850, 820, and 745, and part numbers such as 804175-1B1, HSTNN-DB9Q, and HSTNN-IB9J. Because the price is consistent, your focus should be on matching the exact part number and generation rather than comparing cost between models.

Generally no, batteries are rarely cross-compatible between generations or sub-series. There are 70 distinct part numbers across roughly 1062 models, and capacities range from about 42 to 98 Wh with voltages from 7.7 to 19.0 V. For example, an EliteBook 840 G1 pack (CM03XL family) does not fit an EliteBook 820 G3 (SN03XL family). Always confirm the part number printed on your battery or listed for your exact model before ordering.

Cell count, capacity, voltage, and form factor differ by sub-series and generation. The 840 and 850 are mainstream high-end business units, the 820 is more compact, and the 745 is the AMD-based alternative sharing the 800-series chassis. Early models used removable external packs, while G3 and later use internal lithium-ion batteries. Capacities span about 42 to 98 Wh and part numbers vary, for example 687517-2C1 versus HSTNN-IB9J, so each sub-series and generation pairs with its own battery.

Check the battery label itself, often visible after removing the bottom cover, or look up your full model name and Product Number on the underside of the laptop. The Product Number usually ends in a suffix like #ABA. Match those details to a listed part number such as 804175-1B1, HSTNN-DB9Q, 3ICR19/65-2, or HSTNN-W42C-A-B. Since 70 part numbers cover the line, having the exact generation (for example, G5) ensures you pick the right one.

Yes, with the right model match and basic tools on most units. Early EliteBooks had removable external packs that release with a latch, while G3 and later use internal batteries reached by removing the bottom cover and disconnecting the pack. Identify your generation first, then confirm the part number (for example, SN03XL for an 820 G3 or a CM03XL-family pack for an 840 G1). Capacities run about 42 to 98 Wh, so always install the battery rated for your exact model.

Watch for sharply reduced runtime, the laptop shutting down well before reaching zero percent, or the system staying powered only while plugged in. You may also see a battery health warning in HP or Windows diagnostics. Since capacities range from about 42 to 98 Wh, a worn pack holds far less than its rated figure. When runtime drops noticeably, match your exact model and a part number like HSTNN-IB9J or 687517-2C1 for a replacement priced at $68.99.