I have an iPhone 6S running 10.2. I have had it for about a year and it is Jailbroken. Up until last week it had been running perfectly, and suddenly I noticed the battery was draining much more quickly than before. I almost never got below 30% by the end of my work day (9-6), now I have been having to charge it at work. It also seems to be charging more slowly. I haven't made any major changes or downloads to my phone nor added any new Jailbreak tweaks. I even went in and turned off background app refresh and location services on a few apps to no avail. Any idea what this could be?