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The black Premium 6-Cell Lithium-Ion Laptop Battery from BTI provides additional power to your laptop when needed. It is compatible with HP 451085-121, HP 451086-161, HP 451545-251, HP 451545-361, HP 456864-001, HP 456865-001, HP 491278-001, HP GJ655AA, HP HSTNN-FB51, HP HSTNN-IB51, HP HSTNN-IB52, HP NBP6A73, HP STL-CHA-SON models.