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This Axiom high-performance 6-cell Lithium-ion battery for HP ProBook models is designed and manufactured to meet the HP QK646AA and QK646UT original specifications. The Axiom QK646AA-AX is rigorously tested and qualified for use within the designated HP models to ensure compatibility and 100% guaranteed compatibility. Axiom offers a wide range of laptop batteries for the leading laptop brands. Each battery undergoes a stringent design, manufacturing and quality assurance testing. Each battery test qualifies functionality and ensures full compatibility with the corresponding laptop brand and designated system model.