Get power when and where you need it with the thinkpad 135 w ac adapter keep one in the office one at home and another in your carrying case for convenient access to power just plug it into an available wall socket to deliver ac power to your compatible thinkpad laptop and recharge the system battery thinkpad ac adapters are compact energy efficient energy star v es 20 rating and backed by a one year warranty performs to the same specifications as the standard ac adapter that is suppl