OPPO K12 aka OnePlus Nord CE4,The specifications are also the same for both the phones.

OnePlus Nord CE4/OPPO K12 and OnePlus Ace3V have almost the same design,

straight screen without plastic bracket + plastic middle frame + glassback cover:

From Oppo's "5 minutes of charging, 2 hours of talk" in 2014 to "5 minutes of charge, 10 hours of talk" in 2024, the K12 mobile phone will enable a new era of "100-watt flash charging + ultra-long battery life". This phone will be equipped with a long-life 100W super flash charge and a 5500mah large-capacity battery. This golden combination is rare among mobile phones of the same grade. It can fully charge the phone in 27 minutes and has a battery life of up to four years.

After data analysis, the DOU battery life test results of OPPO K12 show that its battery life can reach 1.88 days, the talk time can be up to 43.47 minutes, the gaming time can be up to 8.76 hours, and even the standby time can be up to 17.28 days.

BLPA45 for OnePlus Nord CE4 and Oppo K12 5G