Does it cause problems to leave the phone charging overnight? Like, do battery issues develop over time and what about having the screen on all the time?
There are a lot of good reading you can find on this forum regarding this matter but the most important things you should keep in mind for a healthy (Li-ion/Li-po) battery are:
- do NOT keep the screen ON while charging (so an always on night clock is a bad idea)
- charge the phone when it reaches 40-50% and never let it get close to 0% (it's better to charge the phone 3 times/day than once every two days if by doing so it gets close to 0%)
- charge the batteries to 40-70% if plan to store them (don't fully charge a battery if you plan to store it for more than a week or so)
- avoid overheating (obviously)
In an ideal world you should not charge the phone overnight either but this an non-issue really because most phones switch to battery (and even laptops) when the charge is complete and restart charging after a 1-3% drop (your battery will degrade with 1-2% in like 2 years or so because of this compared to up 60% in the same period if you let it "die" on a daily basis).
The way I' using my (
almost perfect) T3 HOX (with light to moderate use), it rarely drops bellow 40% after an 16h day (with everything ON), so I'm pretty happy with it.
Have fun!