Battery drain (I need no more characters)

Recently my oneplus nord battery is draining. I want to know how to fix it. Also, does it have to do that I haven’t updated my device since I bought it years ago? (FYI, I have cleared my apps’ cache. And I have restarted my phone with plenty of time inbetween shutting down and starting up.)

If I need to update, from where do I do that? My phone’s updates shows zero, after htting the updates’ refresh button.

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If you didnt update the phone sincw five years, you have to upgrade manually. Your model have “easy installer” check this

https://doc.e.foundation/devices/avicii