A:AnswerI don’t know the official answer to this - But I have had mine a couple months now and I leave it on all the time and it just shuts off when it is full charge
A:AnswerWhat you get is a wireless charging pad with attached cable (USB-A) and a USB power adapter.
Phillips of course says that you must use the supplied power adapter but there really doesn't seem to be a reason for that as long as you have an adapter than can supply the required wattage.
The wireless charging pad and the shaver both follow the Qi standard so you can just use any wireless charging pad, though positioning might be tricky depending on how the pad is shaped.
A:AnswerThe cheaper model (SP9820/87) uses a regular charging cable. I do not know if it supports wireless charging but I would guess it does not. The more expensive model (SP9860/86) uses Qi wireless charging and includes the wireless charging pad. It does not have a charging port.