I hope that this isn't a redundant question, but I am a new owner and trying to determine if what I am experiencing is to be expected or if there is an issue. When I charge, it turns off (stating 'fully charged') at 185 miles. This is in Standard Mode. Is this to be expected on a battery (that has been well cared for) with only 15,000 miles on it? Any direction you can give would be appreciated.