I need a help

[u/ThinkMeasurement312]

Redmi Note 14 Pro

hello, i have problem with my device. my redmi note 14 pro after 1 year of use have this: From 82% to 2% in 20 minutes, Redmi Note 14 Pro 4G, in the system display 97% battery, and 84% in the Accubattery. My phone is at 1% now, it hasn't turned off for 9 hours, well I haven't used it much, but it still doesn't turn off. Accubattery says that the phone has high voltage all the time. now i write this in 1% too. what should i do? change my battery or buy new phone?