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So I fixed my keyboard issue. Hastily way. Since beginnings I had to press hard on several keys, wich is incompatible with a real use of the keyboard. Mainly letters 'a', 'e', 'm', 'h' (and mny more)...are swallowed. But sometimes it has worked as expected (not often), and sometimes it's a real pain (often). Average : a bad experience Example with taping this as fast as possible : "Les chiens aboient la caravane passe" Ls cins aboint la caravan passe Ls chiens aboint l crvane passe Ls cins abint la caaravan pass Digging into software doesn't help to find a workaround

You put my arguments, which are on the same level of the contra-arguments from Rob. S. in terms of credibility and circumstantial possibilities, in the field of religion and conspiracy theories. Doesn't it go a little further past objectivity? "When a theory cannot be disproved, it does NOT make it correct". Yes, but it doesn't make it wrong either. Also, your saying applies equally to Rob's opposite opinion. I prefer to keep it to myself, who usually hastily judges unpopular opinions as religion and conspiracy theories.

PS And we NEVER want the battery to go deeper than when the OS do an Auto-shutdown, that is when it detects the voltage drop point is reached. Trying to charge a phone in this state will likely fail, if people did NOT set fastboot oem off-mode-charge enable Apart from the battery health, deep discharge can -if the above is not set- cause the phone to get in a state where you can not charge it. See e.g. the thread by @Spargeltim here. It is really annoying that phones usually come with this switch set in a way that might render it in need of service, if it depletes.

Deep discharge should indeed generally be avoided, though the system should do an auto-shutdown before the voltage drop starts. The only benefit is calibration, so perhaps once a year. Similar the system ought to take care of not overcharging too (it charges slower towards the end), and in daily life it is hard to stop the charging below full. Some software exists allowing more control, but AFAIK only for rooted devices. So my general advise is to use a slow charger, when the device is idle, e.g. at night. (More hints see e.g. this )