I'm guessing it would take some battery to leave it on. Why don't you leave it on for 24 hours and check the battery usage in settings.
1 if you notice a bigger drain than normal, you've answered your own question
Or
2 look in settings under usage/battery usage and if it's listed there you may see a high or low percentage.
If no one else can give the short answer you are looking for, try the above.