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HP Compaq Presario CQ32 CQ40 CQ42 CQ45 CQ50 CQ56 CQ57 CQ58 18.5V 3.5A 65W 7.4mmX5.0mm Pin Dia Adapter | How to choose a suitable charger for your laptop? Check the DC output V&A of your original with can be found in the label of your original charger. Make sure the output volts and amps are 18.5V 3.5A 65W. Exactly the same as your original. Check the connector of your original. Make sure the connector size is 7.4mm*5.0mm|