This rating could go up depending on the charger. Their delivery was quick so I have no problem with the company. The charger after a 12 hour charge, discharged within 30 minutes of checking email. Charged it again for 12 hours and will see how long it takes this time to discharge. I would have thought it would take longer to discharge than 30 minutes. As long as the discharge time increases, then maybe there isn't a problem with the charger.