Update, I've just done the battery replacement today with BM53 battery (5000mAh) instead of BM4Y (4520mAh). Size wise it fits, just the "bend" on the battery ribbon/connector need to bend it slightly more towards the right to match Poco F3's position. Backcover went back on OK. Have yet to apply T8000 glue just put the cover back on with residual glue on the cover at the moment. *lazy to clean the glue + wanted to just try it out first.
Tested on charger, and confirmed the issue with Quick Charging/Turbo Charge. Without doing anything to the daughterboard, it is actually "triggering" quick/turbo charge when plugged in but that's about it. It's charging at under 10W not the usual 25~33W. Guess really need to MOD the daughterboard if want to get back turbo charging. But this is my second phone I guess will just play with it like this at the moment see try out the battery life while still keeping the old battery. Just need to give it a bit more time to charge haha.