public Battery(string model, batterryType? type, int? hoursStanby, int? hoursTalk)
{
this.model = model;
this.type = type;
this.hoursStanby = hoursStanby;
this.hoursTalk = hoursTalk;
}
public Battery(string model, batterryType? type)
: this(model,type,null,null)
{
}
