Phone is very slow charging
Try to clean the charging port of your phone
I think coz its now 3 year old
Many threads are there for solution.
One of it is clean charging port, use only OP's Dash Charger is another.
Buy a new charger
Please look for the wire properly working as it can get cuts from edges.
Press volume down and power button same time. Select English, wpie cache, better choosing correct else ur entire data goes away.
Clean ur charging port, check cable and do the wipe cache thing
Try a different charger.
Get the battery replaced.
Go to service center, I got mine changes for 600 rs using red cable club discount. Including service charges.
Customise your phone for draining issues. And check the cable/charger for slow charging.
Also check if your battery is ok. Does it last like it used to or it last less? In my OP5 y changed the charging port because it didn't charge properly.
AMA - OnePlus Support Dec Edition
by Tom B., 2020-11-30