Question Redmi Note 11 33 Watt charger damaged Redmi Note 8 and Redmi Note 7? - Xiaomi Redmi Note 8 (2021)

I just recently got a new Redmi note 11 and also received a 33 Watt fast charger with it. I already had two other phones Redmi Note 8 and Redmi Note 7, I started charging all 3 phones with the same 33 watt fast charger that I received with redmi note 11 but after 3-4 months I noticed both Redmi Note 8 and Redmi Note 7 started showing the same issue that they were rebooting automatically whenever I increased their volume beyond 70% while they were on battery but functioned normally while plugged to a charger.
Then after that just two days ago the Redmi Note 8 started getting a cycle of rebooting and turning off back and forth irrespective of the volume increase. I had to stop this cycle by plugging it into the charger and then starting it or switching it off, it used to at least charge while plugged in but now it has stopped even charging fully.
Redmi Note 8 and Redmi Note 7 both seemed to support a maximum of 18 Watt fast charging but I read somewhere that the 33 Watt charger will automatically adjust as per the device requirement but now I am thinking that the 33 Watt charger has danaged the batteries or something else like the curcuits in my older Redmi Note 8 and Redmi Note 7 phones? I am really depressed because I have a lot of personal memories attached to these phones but now I fear losing them. Please help !!
Do you think this was the reason? Please let me know so I can avoid this mistake in future?

the batteries are damaged, that why the phones bootlooping, jsut buy a new ones and replace them and done

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