A diet based on 1200 calories daily is the recommended minimum for safe and healthy weight loss. This is because 1200 calories will generally provide an adequate nutritional intake for most individuals, yet still allows the reduction of calories to the level that most dieters require in order to lose weight.
Stand-by time (battery life) Stand-by time is the officially quoted longest time that a single battery charge will last when the phone is constantly connected to the GSM network but is not in active use. The stand-by time is highly dependent on the cellular network environment, such as the distance to the closest GSM cell tower (base station).
Now that you've given your One a full charge and restarted it, your battery life should be restored to full capacity and your One should last 7-10 days before having to recharge it. Should the problem persist, I would suggest contacting the support team and see what they can do for you.