Essential to the purchase of your new laptop battery is the part number. A part number is a unique identifier that is assigned to a part to simplify referencing and to unambiguously define a part within a single manufacturer. Knowing about part number of the battery will more accessible to buy a correct battery, and it is comparatively accurate to search a battery by its part number than the model name of laptop.
A laptop battery has at least one part number (that is, the battery model we often say), and many batteries even have multiple part numbers. When you find a battery with the same part number as your laptop battery, you can be sure that it is fully compatible with your laptop.
Dell Battery Part Number Identification
Dell and Alienware are the same company. Alienware part numbers can be a little strange but typically they are clearly marked. Dell part numbers are easy to find. They are called "Type" numbers. The "Type" is almost always listed near the Dell/Alienware logo.
Please note that the serial number or S/N is not the same as the battery part number. The serial number is unique to only your battery and will not help with finding your replacement battery.
Examples of Dell Battery part numbers: