On May 6, 12:18 pm, MIG wrote:

And you can only do it by registering to be electronically tagged.

You can always have two cards. One is set with auto-top-up so it can
never run out. The other is an unregistered card that you top-up with
cash. Usually you use the unregistered card. Only if your registered
card runs too low and you can't top it up do you use the registered
card. (You could miss out on a daily cap if your card runs out part
way though the day)

Tim.