I've had this or a similar problem with the meter, but you're correct in saying that it just keeps working anyway. My one is sufficiently old that it is past repairing and I don't use it that often anyway, but exposure still seems pretty accurate and Ilford XP2 would be printable even if it was a couple of stops out. You'll need the batteries for the shutter release as well as the meter. I'd just live with it!