I have been having this issue since updating my phone (Pixel 6 Pro) to Android 13. The battery life of my Galaxy Watch 4 Classic (SM-R890) has tanked. I used to get 2+ days of battery life with the watch and after the Android 13 update I got well less than a day. Many people on reddit have the same issue. It is not related to the watch, Other Wear OS watches are having same issue (like TWP3). This appears to be a Bluetooth issue with phone. When I turn off Bluetooth on my phone, my watch is back to 2+ days. In the Sept. update bulletin It said "Fix for issue occasionally preventing certain Bluetooth devices or accessories from connecting". I was hopeful that the Sept. update would fix this issue but alas it does not. I have the Verizon Sept. update (TP1A.220905.004.A1). I currently turn off Bluetooth on my phone so my watch's battery does not drain. It kind of sucks having a smart watch not connected to phone. Does anyone know if there is a way to resolve this issue?