Originally posted by wlachan No idea, but I don't trust generic batteries, and generic lithium even less. Sorry for being unhelpful but I think it's a dumb idea to risk a 1.5k camera with a cheap batt. I can cheap out on many things but never on batteries which can go wrong in so many ways.
I trust them. I have two Pentax batteries and a few generic batteries for my K10D and K20D. Had no problems whatsoever with any of them.
I've just ordered a K-5 and ordered 2 generic batteries too.
As mike-P said above, in the UK a Pentax battery is 7 times the price of a generic one.
If Pentax started selling batteries in the UK at a non rip-off price then I will buy them