Aspire E5-575G computer switches automatically w/o any reason from electrical power sourceto battery

@Puraw
Hi, Puraw. Thank you very much for your quick answer and your support.
Following your sugestion I've checked my Bios Vs and it was version 1.20 that is out date. Now I've downloaded and installed the 1.47 and tested newly how it works related to the issue. Unfortunatelly the issue still appears. I attach "Battery report" and I also attach a general HW report from the HWiNFO utiliy where you can find a lot of details of my computer.
Related to your question about how I determine that the power is switching there are a few indicators: The computer sounds with a beep when it switches form cord to battery mode. Also in the taskbar Icons the Icon that indicates the power origin changes from the plug icon to the battery one. And also the physical unit led in the computer, switches from Blue to amber lighting.
The beep sounds two times in short time because the system returns quickly to the plug mode power and it is reflected in the taskbar power icon and in the computer physical led.
Sorry if my English is not very good. I hope you you would be able to understand it anyway.
Thanks in advance for your help.

@Puraw

Hi again, Puraw. Sorry for the delay in getting back to you. I have been trying to find someone with an ACER laptop with a compatible power adapter, but so far I have not found anyone.
I have decided to purchase a new, compatible but higher capacity power adapter and am now waiting to receive this new one. It is a unit identified by the manufacturer as compatible, with 19V and 4.7A output but 90W instead of the 65W of my current adapter.
I have also purchased an internal battery AS16B5J, Li-ion; 10.95V; Capacity 5600mAh/61.3Wh.
After searching for a while trying to locate a local official Acer parts distributor. At least in the Spanish ACER website I have not found these items, so I have decided to try with compatible spare parts that I have found in the Amazon website.
I have also, physically checked the computer power connector and the internal battery. “Visually" I found no relevant damage.
I attach some pictures for more information. The battery currently mounted is the original battery as you can see in the pictures, it has the ACER logo. The external power adapter is also original from Acer but in this case does not appear the logo of the brand.
Regarding the OS installed on the computer, yes, it is as you say, it was installed in 2024, on January 6. The computer was bought by my son a few years ago and now that he has a new one he has given me this one for my personal use.
I decided to perform a clean install of Windows 10 Pro following the procedure recommended by Microsoft: downloading the latest build available from the Miscrosoft website, creating a bootable USB and starting the installation from this USB.
I have checked again the Windows version installed and I can confirm that it is version 22H2. You can check it in the report “HWiNFO® 64 Report_2024-10-20.pdf” that I attached, in this same conversation, last 2024-10-20. The information is consistent with that shown in the configuration window and is also the same as that obtained from Powershell's systeminfo command.
The operating system is updated regularly using the native Microsoft Windows Update utility.

I'm not sure how long can take the reception of the new battery and power adaptor, but probably it will take a few days.
I'll mount and test them as soon as possible and let you know any news.
Thanks a lot for your support.
Regards.

@Puraw

Hi again, Puraw.
Yesterday Saturday I finally received the order and I started with the replacement and testing tasks to do it in an orderly and phased manner.
The first test which was the quickest and simplest was to replace the power adapter after checking, as you suggested in your comments, that the connector was the right 5.5*1.7mm.
The connector of the new adapter has exactly those measurements and the fit in the laptop connector is perfect.
I connected the adapter to the laptop, turned it on and spent some time to check if there was any difference in the behavior of the laptop. I started several applications and above all the application that for me is the fundamental one and that was the main one affected by incidence. The tests gave a satisfactory result. The computer was stable and the application/s responded normally.
The application in question is CUBASE 13 from Steinberg. It is a DAW (“Digital Audio Workstation”) software where logically continuous real-time processing is required. I guess that the high CPU demand, together with the continuous disk access, generated a high power demand that ended up exhausting or even damaging the original adapter. That's probably why it got so hot. Now with a new and more powerful adapter it works with more margin and at least for now, it only heats up slightly.
After spending some time testing that and other applications, I did not detect any problems with the computer. I then decided to move on to the second part: Replacing the old internal battery with the new one. To do this I unplugged the computer and disassembled the back case as I have done on several occasions. I then disassembled the old internal battery and put the new battery in its place. I checked that the model corresponded and the size and general appearance was the same. I also checked the connector to the motherboard and seeing that there was no difference I proceeded to connect the new battery to the PB. I then reassembled the back case and proceeded to perform the same tests I had done with the new power adapter.
In the meantime, the battery was charging. When mounted it was just over 60% of the estimated maximum charge and within an hour or so it was fully charged.
In the tests I performed I did not detect any incident, everything worked normally. I attach several images to illustrate some details. And I also attach two new reports from “powercfg /batteryreport” one with the old battery and one with the new battery.
The new battery report still indicates that the battery does not support the “Connected Standby” feature.
I don't know if this will be a problem in the future but at least, for the moment, it doesn't seem to be. I also don't know if there is a solution for this feature for this model of laptop. If you have any suggestions, please let me know.
In short, I think I should consider this issue resolved, but first I would like to thank you for your help, your suggestions and indications, your patience and the time and knowledge you have contributed. I would not have known what to do without your help.
Thank you very much! It has been a satisfying experience for me to have your help.