Solutions to iPhone 6 battery draining fast:
1. Monitor Battery Usage. Go to Settings > Battery to find the option and then turn off certain features that consume too much power.
2. Check Charging Accessories. Unmatching charging accessories are very likely to cause damages to your battery, making its life becomes shorter and shorter.
3. Turn Off Background App Refresh. Settings > General > Background App Refresh.
4. Chances are that there is something wrong with your iPhone software. Faced with this, try
Joyoshare iPhone system recovery to fix the issue without data loss.
5. If it is the battery itself that causes the issue, go to the Apple store to ask for help.