The HP N66427-001 is a four-cell lithium-ion replacement battery for select HP laptop configurations. Check that the part number is specified for your laptop before choosing it.
It is identified by model WE04XL; the product listing also gives WE04068XL-PL. Its stated energy capacity is 68Wh, with a charge capacity of 4.405Ah. These identifiers and ratings help distinguish this specific battery during service or replacement.
Its four-cell design and stated capacities describe the part for configurations that specify N66427-001.