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You can take a look here:
/t5/Xperia-XZ/How-to-disable-low-battery-sound-notification/td-p/1190910/page/2
Hi @Pingla, are you referring to the notifications, or the actual sound which comes with the notification?
Regarding the sound, I posted some information regarding that in the link provided by @alexdon. Namely, you may mute the first notification at 30% by setting notification sounds to None under Settings > Sound > Notification sound > None, but the notification at 15% will still be present. This won't mute the notification at 15%, it can only be muted by setting the device sound settings to Mute. You may do so by lowering the volume completely with your physical volume buttons on the side of the device, and then tapping it depending on if you prefer Vibration mode or completely Mute.
As far as the notifications themselves go, I'm afraid that there is currently not a setting for disabling these, I apologize if it is an inconvenience for you.
Let me know how it went! 
Hi, I recently updated my Sony Xperia Z5 Compact to Android version 7.0 Nougat. Now I have a problem with the low battery notification that happens at 30%. It is very loud, like full volume loud and even though I have all of the volume sliders at the lowest setting it is still very loud. Strangely, at 15% battery the volume for the notification is where it should be.
Is anyone else having this problem or know a solution to the insanely loud notification sound?
as far as i know there is no option on how to adjust the Low battery level notification, but you can adjust the level in which stamina mode kicks in. it defaults to 15 %. go to settings>battery
Hi @Sizzle3,
Welcome to the community,
I can advise that the handset will provide an alert for both 30% and 15% battery level, there is a way to stop the notification sound however it is not suggested.
You would either need to set the Notification tone to none within the sounds menu (this means all notifications will have no tone until you change it again) or you will need to mute the handset close to the 30% level.
I hope this helps.
Since the last update now when my battery is at 30% the notification sound is the same as my text message etc. Is there any way to change this or turn it off? I've had a look in settings but cannot seem to find anywhere to change it.
Thank you!
Another major problem is that AFTER the Z5 is turned OFF, it starts up again (and again) to display a low battery notice on the screen. This happens even if the Z5 is plugged in. Do we really need a visual low battery notice constantly appearing when the phone is plugged in?
What could the designers have possibly been thinking?
This is the
Exact reason I changed from Sony .that annoying notification when your battery is at 30 and 15% is completely pointless. I know how much battery I have I can see on the phone. Why then don't give the option to disable is beyond me. Utterly useless.