
@Chatz13, regarding your question about memory cleanup - maybe these links will help you:
iPhone: https://support.apple.com/de-de/HT201656
Android phone: https://support.google.com/android/answer/7431795?hl=de
Kind regards, CorinaS
Basically, it is important to generate as little data waste as possible. You can remove apps that you no longer need by long-clicking on the corresponding icon.
However, you can only completely free a device from data waste by performing a factory reset. Then you only reinstall the apps you really need. This method is very time-consuming but the most effective. Before that, you have to back up the data that you still need.
The tip about charging (10-90%) cannot really be implemented consistently in reality. And from a technical point of view, depending on the device used, it has long been outdated.
Android, for example, knows the setting for battery conservation. In this mode only the range 10-90% of the battery is “extended”, but the display is still scaled to 0-100% in order not to confuse customers. Specifically, this means that the device switches off when the display shows 0%, but the battery itself still has 10% charge. A full charge is displayed as 100%, but only corresponds to 90% charge.
If you also follow the tip with 10 - 90% in this mode, then you will actually only use the battery in the range of 20 - 80%, i.e. the operating time of the device with one battery charge is only a little more than half as long as expected, which is certainly not what the user has in mind.
The biggest battery killers are fast chargers anyway. If you want to conserve the battery, charge the device as slowly as possible. Depending on the device/OS, this can be set in the system. My tablet takes 2 hours in normal mode and 1 hour in quick charge mode. Since the battery still heats up relatively strongly even in normal mode, I use the weaker charger from the previous model, so the charging time is 4.5 hours. If I need to go faster for once, I can always switch to normal or quick charging mode. I also make sure that the device does not heat up unnecessarily in the sun or in the car.
Thanks to these measures, the battery still shows a capacity of 94% after 2 ½ years.
Sustainability/protect the environment? I had to throw away my first cell phone because it no longer had a battery and I’ve been using the Samsung Galaxy A8 for about 2.5 years now and have to change it again because the “software” is no longer updated and there are security gaps. Unfortunately, constantly new models “force” you to change your cell phone long before it no longer works.