It depends on your exact model, because the Fujitsu LifeBook line covers several sub-series with different packs. Most are lithium-ion in the FPCBP or FPB part-number families, running about 10.8V or 14.4V with capacity from roughly 3000 to 5000 mAh. As examples, E-series models like the E733, E734, and E756 often use FPCBP416, FPCBP405, or FPCBP429, while U-series models like the U747 and U748 use FPB0338S. Prices in this category run from $55.99 to $57.99. Always confirm the part number on your old battery.

Start with the exact model number on the bottom of the laptop (for example U748 or E756), then check the part number printed on your current battery, such as an FPCBP or FPB code. Matching both the model and the part number is the surest way to get a compatible pack, since voltages range across 10.8V and 14.4V and capacity spans roughly 3000 to 5000 mAh. The number on the battery itself, like FPCBP416, beats relying on the model name alone.

Replacement batteries in this category run from $55.99 to $57.99. The exact price depends on which sub-series and part number your model takes, since cell counts and capacity differ across the line (roughly 3000 to 5000 mAh, at about 10.8V or 14.4V). To make sure you are pricing the correct pack, match the part number on your existing battery, such as FPCBP429 or FPB0338S, against the model you own before ordering.

No, not across the board. Even within the Fujitsu LifeBook line, sub-series use different part numbers, connectors, and form factors. For example, an E-series E756 may take FPCBP416, while a U-series U748 uses FPB0338S, and the two are not interchangeable. Voltages also vary between 10.8V and 14.4V depending on cell configuration. Always confirm your exact model and the part number on your old pack before assuming one battery fits another.

The main differences are battery type, cell configuration, and how you install them. U-series and P-series ultra-portables typically use internal lithium-ion packs (like FPB0338S) that need base access, while E-series and A-series models often use removable, user-swappable packs (like the FPCBP416 family). Voltage shifts between 10.8V and 14.4V, with some slim cells near 3.8V, and capacity ranges from about 3000 to 5000 mAh. Because of this, each sub-series has its own part-number family.

The part number is printed directly on the battery itself, usually as an FPCBP or FPB code, for example FPCBP429 or FPB0338S. On removable E-series or A-series packs, release the battery from the underside and read the label. On internal U-series or P-series models, you may need to unscrew the base to see it. You can often cross-check against the model number on the bottom of the laptop too, but the code on the pack is the most reliable.

Often yes, but it depends on your sub-series. E-series and A-series models commonly use removable packs that release from the outside, so a swap takes seconds with no tools. U-series, P-series, and many convertibles use internal batteries (like FPB0338S), which means removing screws and opening the base panel. If you are comfortable with a screwdriver and grounding precautions, internal swaps are manageable. Confirm whether yours is external or internal before you start.

Watch for runtime that drops well below what you used to get, a charge that stalls or stops short of 100 percent, sudden shutdowns even when the meter shows charge left, or a pack that no longer holds a charge after a full cycle. If your system reports a high cycle count or flags the battery health, that is another cue. A pack rated near 5000 mAh that now runs a fraction of its old time is a strong sign it is time for a replacement in the $55.99 to $57.99 range.