So I no longer use the OEM charger since it started charging my phone at a low amperage, less than 500mA. And I'm not sure if this was the root cause but my battery life was terrible. I eventually started to use my HP touchpad charger which actually charges it at 1.5A and my battery life improved. I've been using current widget for the past 6 months and it seems to fairly accurate. I'm thinking that it could just be the jack on my phone that might be slightly damaged since the USB cable was once yanked out due to someone tripping over the cable.