1: This is a lithium battery. 12 hours does not need to be fully charged. Charge as much as you want, and it is usually enough to discharge the battery. You can listen when you are full, but it is not recommended to listen at the same time.
If you understand charging, this problem is not difficult. After charging for a few hours, the song can be transmitted without waiting 12 hours.
3:gogear？ There will be some files in mix, please don't delete them. These are system files.
4. There is no such thing. As long as you have a receipt, you can guarantee it. You don't need to register online to guarantee it. And this thing is rarely heard to be broken. It usually takes 2 to 3 years without any problems.
As for the fifth question, your thinking is too complicated. It's just mp3. Upgrading doesn't make much sense. You can't increase the capacity and improve the music effect, so it doesn't make much sense to upgrade.
6: If you don't delete your own files, you don't need to back them up.
7: If you want the format, please back it up. (These are system problems)
8: Now the official has not given a clear answer. What is a lossless format? Ape? There is flac, which has a larger capacity than mp3, so the music effect is better than mp3, but you have to understand that if you use this gogear? Mixed? It makes no difference whether you listen to lossless format or not, because there are good music files, good machines and good headphones. Generally, you need to use Philips she9800 headphones to hear better results. At present, this earphone is 699 yuan, and it is unlikely that you can match an earphone that is three times more expensive than this machine, so the effect of lossless format cannot be reflected.
In addition, I suggest you buy two headphones, Philips she7750 or she8500, which are much better than the original headphones, namely 80 yuan and 100 yuan respectively. It is strongly recommended not to use the original headphones, because the effect is too poor and the hair is always not very good.
Well, if there's anything you don't know, just ask me.