It depends on the exact model and generation, since this category covers 70 distinct part numbers across about 1062 HP EliteBook models. Batteries are lithium-ion, ranging from 7.7 to 19.0 volts and about 42 to 98 Wh. For example, an EliteBook 840 G5 commonly uses an SS03XL pack, while an 840 G1 uses CM03. Common part numbers in this line include 804175-1B1, HSTNN-DB9Q, and HSTNN-IB9J. Check the part number printed on your current battery to confirm the right match.

Identify both the full model name and the generation, for example “EliteBook 840 G5,” because compatibility rarely spans across different “G” generations even when the model number is the same. The most reliable method is to read the part number printed on your existing battery, such as SS03XL or HSTNN-DB9Q. With 70 part numbers covering roughly 1062 models, matching that exact code avoids ordering a pack that fits the chassis but not the connector or voltage, which ranges from 7.7 to 19.0 volts here.

HP EliteBook replacement batteries in this category range from $34.99 to $133.99. The price depends on the generation, capacity, and cell count, with capacities running from about 42 to 98 Wh. Higher-capacity 6-cell packs and newer internal designs tend to sit toward the upper end of that range, while smaller 3-cell options fall lower. To find your exact price, match the part number on your current battery, such as 687517-2C1 or HSTNN-W42C-A-B, to the listing.

Not broadly. Battery compatibility rarely crosses generations, so an 840 G1 pack (CM03) will not fit an 840 G5 (SS03XL) even though both are “840” models. Across this line there are 70 distinct part numbers and voltages spanning 7.7 to 19.0 volts, so the physical size, connector, and electrical spec must all match. AMD models ending in “5,” such as the 845, do share battery types with their Intel counterparts in the same generation. Always confirm by part number before buying.

The main differences are capacity, cell count, and whether the pack is internal or removable. The 800 Series (830, 840, 850) shifted from removable to internal batteries around the G3/G4 generation. The 1000 Series (Folio, 1040, x360) uses thin internal packs like SS06XL on the 1040 G3/G4. The 600 Series (640, 650) is the entry line with internal packs on recent models. Capacities across all sub-series run from about 42 to 98 Wh, with part numbers like HSTNN-IB9J varying by generation.

The part number is printed directly on the battery label, often in a format like SS03XL or a longer code such as 804175-1B1. On newer internal models, remove the bottom panel to read the label on the pack itself. On older removable-battery EliteBooks, release the battery from the underside and read the label. If the laptop still powers on, you can also locate the battery information through the system software. Matching this code is the surest way to pick from the 70 available part numbers.

Yes, on most models. Older EliteBooks (before about 2014) often have user-swappable removable batteries that release from the underside without tools. Newer models from the G3/G4 generation onward almost all use internal batteries, which require removing the bottom panel and disconnecting the pack. The job is straightforward with the right screwdriver, and these batteries range from 3-cell to 6-cell designs at 7.7 to 19.0 volts. Always match your exact part number, such as 3ICR19/65-2, before you start.

Watch for sharply reduced runtime, the laptop shutting off well before reaching zero percent, or a battery health warning in the system software. If a full charge no longer holds close to its rated capacity (these packs run from about 42 to 98 Wh), it is wearing out. You may also see the charge stall at a fixed percentage or the system stay tied to the wall outlet. When you notice these, match your part number, for example HSTNN-DB9Q, and order a replacement from the $34.99 to $133.99 range.