Granted, you don't know me, so technically your statement is still true , but I've never charged above 2C on my 406 Duo yet (nor am I really intending to - so far) - and not because it's been banned or anything, but because I haven't felt the need to do so (and I simply didn't want to risk any of my batteries...). It's nice that I could, though..

But I have a hard time anyway, imagining that anyone over here would really act on their warranty at all on an item like a battery, once it has been in use for a couple of weeks after purchase - just a feeling though: so far none of mine has ever even puffed, and I never had to try to go for warranty.