which you should avoid. The first battery was delivered only be charged to 85% battery capacity in an HP NX6310. The battery life then was about 1h 20min. In comparison, the original HP battery which is no longer available Unfortunately, 2h 30min held. The HP's tool "Battery Check" also diagnosed the supplied battery as defective. After complaining to the dealer "Trade shop" returned immediately another battery in exchange. Result: did initially only 75%, then charge after 7 recharges only on 70%. It only stands to reason that either the battery is not compatible with the HP NX6310 notebook model or that the product sold battery model (from the Far East) is not technically correct. This is also the second battery back against refund.