The Wakemate website states that the device's battery lasts 2 to 3 days depending on your sleeping patterns. Battery estimates are bound to usage in every device from the Wakemate to your laptop. The reviewer realized that for him, the device lasts two days before needing a charge, and even then kept using it for the three days. As I already said, if you realize that your smartphone only lasts two days with your usage (even though the manufacturer might say that it can last up to three), it would be stupid to keep trying to use it for three days.
It's user error to rely on estimates of 11 or 12 hours when you discover that you drain the battery faster than said estimates.
It's user error to rely on estimates of 11 or 12 hours when you discover that you drain the battery faster than said estimates.