The Dell 542WP is an internal replacement battery for a compatible laptop, supplying power when you work away from a mains connection. The part number identifies this specific battery for checking against the laptop’s requirements.
It uses lithium-polymer technology and has 3 cells, with a stated energy capacity of 42 Wh and output voltage of 11.4 V. Its black, internal format means it is fitted inside the computer rather than used as an external power adapter.
The 542WP is intended to replace the battery in a compatible laptop that uses this part. Its capacity and voltage describe its electrical characteristics; compatibility depends on the laptop using this battery part. It is for laptop power during mobile use.
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