WorldCharge WCH-6120 Battery for HP 6510b, 6710s, 6715b, NC6100, NC6200, NC6400, NCX6100 Every unit is pre-tested in original equipment 100% functionality and compatibility Save over costly OEM replacements CEC-compliant energy-saving design Designed for HP 6510b, 6710s, 6715b, NC6100, NC6200, NC6400, NCX6100