Should I charge phone overnight or let battery down to a minimum? For many times I found myself in a situation, that my battery charge was about 25-30% when I was going to sleep. Since I was always told to not let battery down below 20% (correct me, if that's wrong) I was faced with two options in this situation:


plug phone to charger and let it charge for entire night,
leave it and let it down to about 10-15%, that is below wrong level for battery charge.


I was always wondering, what option is best for my battery's life and phone's overall performance.

Can someone provide information, which option is better in mentioned situation?
Never let it run down below 10% if you can help it. Running down to "absolute zero" harms your battery (and might even render it inoperable – which is why most devices shut-down before reaching that point). Modern LiIo batteries don't suffer from "memory effect", so ideally you'd plug-in a charger whenever possible: "trickle-charging" doesn't hurt them, low charge (less than 5% definitely) shortens their life-span.

For details, please check with...


our battery-life tag-wiki
What can I do to increase battery life on my Android device?
Does constant charging harm my Android cellphone?
Wikipedia: Lithium Ion batteries
our battery tag-wiki
When should I start charging my Lithium battery?
How frequently is it okay to let the battery discharge fully or as low as possible?