I recently bought the Nothing Phone 3a, and for the first couple of days the battery was fine. But after the recent update, the battery started draining really fast.
For example, last night I charged it to 90%, did some light gaming and social media scrolling, and went to sleep at around 12:40 AM with 38% still left. By the time I woke up at 8:00 AM, the phone was completely dead at 0%.