I've never seen a cheap battery from Hungary -- all mine come from Hong Kong and work fine. I don't distinguish my cheap ones from the real one, they all seem about the same to me. I haven't had any significant mishaps with the ones I bought for my N800, N810, or N900. Except one battery I got for free with a charger fit too snugly into the N800.

Edit: But readings might be erratic at times -- I don't watch that closely.