That's what I hear (2.5 per day for free), but I voted 5 or 6 times, and my downvote potency was still about 50%. I think they mean you can downvote 2 or 3 times per day, without depleting your downvote potency. Like with upvoting, where you can upvote 10 times per day, without depleting your upvote potency.