[Blasterlord2]

It is best to let the battery goes to 0%, then charge it.  In this way the battery will last longer, and the charge will last longer too.......

Nope, not true. Those are for other kinds of batteries. Nowadays is lithium ion so try not to let it drop to zero.

I quote from one article:

Minimize the amount of time the battery spends at either 100% or 0% charge. Both extremely high and low “states of charge” stress batteries. Consider using a partial charge that restores the battery to 80% SoC, instead of 100%. If that’s not possible, then unplug the device as soon as it reaches 100%.

https://news.umich.edu/tips-for-extendin...batteries/