Apple Battery Hardware Engineer interview questions

2 technical "screenings" followed by a virtual onsite round with 6 interviewers over a 7 hour period (45 min slots and breaks), completely technical in nature. All questions are drawn from core basics . i.e RC circuits, RL circuits, op-amps, filters, bode plots, DC-DC converter drawings and analysis and some complex circuit analysis. The interviewers were a mixed bunch, a couple very engaged and interested, some extremely disengaged and wanting to get through the round with minimal interaction. Overall there is little emphasis in talking about your past projects, just many problems to solve on the spot. Be prepared with those and you'll likely do well.