The Asus Pro Probook 440 uses a lithium-ion battery, commonly in a 4-cell configuration in the 37Wh to 56Wh range, with part numbers in the same families as other P-series models (such as the A41N1421 4-cell pack). Because configuration can change the exact battery, check the part number printed on your original pack before ordering. Replacement batteries in this category run from $57.99 to $75.99. Many Probook 440 units accept a slide-out removable battery, which makes the swap quick.

Start with the exact model name and the part number printed on your original battery, since the same model (for example a P2540UA) can use different batteries depending on whether it has a dedicated GPU. Look for codes like A41N1421, A41N1501, or C41N1624 on the battery label. Matching that part number is the most reliable way to confirm fit, because cell counts in this line range from 3-cell to 4-cell and capacities from 37Wh to 56Wh across the sub-series and model years.

Asus Pro replacement batteries in this category range from $57.99 to $75.99. The exact price depends on the sub-series and the battery’s cell count and capacity, since these packs span 3-cell and 4-cell lithium-ion designs from roughly 37Wh to 56Wh. To make sure you are pricing the correct battery, match the part number on your original pack (for example A41N1421 or C41N1624) rather than ordering by model name alone, since one model name can map to more than one battery.

No, Asus Pro batteries are not universally interchangeable. The line spans removable P-series packs and internal B-series packs with different shapes, cell counts, and part numbers. For example, a P-series model may use a 4-cell A41N1421, while a slim B9440 uses an internal 4-cell C41N1624, and the two cannot be swapped. Even within one model name, configuration differences can call for a different battery. Always match the exact part number printed on your original pack to confirm compatibility.

The main difference is install style and physical design. Earlier P-series models often use removable, slide-out lithium-ion packs (commonly 4-cell, in families like A41N1421 and A41N1501), making them quick to replace. Slimmer B-series ultrabooks like the B9440 use an internal 4-cell pack such as the C41N1624, which requires opening the lower chassis. Cell counts range from 3-cell to 4-cell and capacities from 37Wh to 56Wh, so the right choice depends on your specific sub-series and configuration.

The part number is printed on the label of your original battery, usually visible once you remove a slide-out pack or open the lower chassis on internal-battery models. Look for codes such as A41N1421, A41N1501, A41N1331, A32N1331, or C41N1624. You can often also find the laptop model name on a sticker on the bottom case. Using the battery part number is more reliable than the model name, since one model can use different batteries depending on its configuration.

Yes, in many cases. Earlier P-series models often have removable, slide-out batteries that release with a latch, so the swap takes only a moment with no tools. Slimmer models like the B9440 use an internal pack (such as the 4-cell C41N1624) that requires removing the lower panel and disconnecting a cable, which is still a manageable job with the right screwdriver. Always confirm whether your sub-series uses a removable or internal battery, and match the part number before you start.

Common signs include much shorter runtime than before, the laptop shutting down suddenly even when the charge reads high, or the battery refusing to charge past a low percentage. You may also see the battery stuck at a fixed charge level or your operating system flagging reduced capacity well below the original 37Wh to 56Wh rating. If you notice these symptoms, check your part number (for example A41N1421 or C41N1624) and order a matching replacement, which runs from $57.99 to $75.99.