I will install the upower indicator app, at least it will alert me when it reaches 90%.
thanks

There are some very good ideas up there. A simple proposal I suggest is:
Ubuntu Touch
freedom for
YU and
MI

@gabo29 you can see the supported devices at https://devices.ubuntu-touch.io/ although not all of them are at the same level of usability.

As this forum is in English if you need help in Spanish maybe the Spanish telegram group can help you https://t.me/UBPorts_ES

puedes ver los dispositivos compatibles en https://devices.ubuntu-touch.io/ aunque no todos están en el mismo nivel de usabilidad.

Como este foro es inglés si necesitas ayuda en español quizás te puedan ayudar en el grupo de telegram en español https://t.me/UBPorts_ES

In krillin (BQE4.5) the good rc is 2022-W05. The 2022-W04 should be avoided.
thanks

Hi, I have installed the mentioned kernel on BQE4.5 (krillin). I haven't been able to test it much yet. The fm radio application (without internet) works. I will observe the rest of the points. Thanks.

I edit with more information
Linux ubuntu-phablet 3.4.67 #1 SMP PREEMPT Tue Jan 11 22:54:05 MSK 2022 1.2.1_20140721-1138- armv7l armv7l armv7l GNU/Linux

In day to day use everything works normally. I think opening the configuration takes longer.

@mardy hello, after putting the previous kernel I see that the consumption is the same (varies very little and may be due to other factors).

Until now I had not noticed that with the 3G network connected without any open application and the screen off, the battery consumption was much higher than with wifi (without any open application).

To revert to the previous kerner I have performed the following steps, in case it is useful to anyone else.
I download the zip file corresponding to my device from.
https://cdimage.ubports.com/stock-bq-images/krillin.zip
from
https://docs.ubports.com/en/latest/userguide/install.html#install-on-legacy-android-devices

I open the zip file with my favorite decompressor.
I extract the boot.img file to my pc
I turn off the mobile, connect the usb cable and boot in fast boot mode.
Using the volume keys select fast boot
On the pc I run the corresponding command
fastboot flash boot boot.img && fastboot reboot