2032 Battery you need - amzn.to/45NQ57h
Here is the all new fob from the 2022 2023 2024 2025 3 Series. This specific fob is from the 330i any fob that looks similar to this one is the exact same process. You will need a new 2032 coin cell battery. Slide the side out as I've shown in the video and use the physical/mechanical key or a flat blade screwdriver to gentle remove the battery tray. Replace your dead / weak 2032 battery with the + side facing downward in the tray. Clip the tray back in and place the side piece back into place. You're all set! No need to reprogram. Hope you found the video helpful!
OEM 2023 BMW Smart Key Remote Fob IYZBK1 3 series 4 button Model BK1