Originally posted by Jonathan Mac The problem is likely due to the use of AA batteries. While I bought my K200D partly because it can use AAs, I subsequently found them to be a massive problem as even good rechargeables performed very poorly. These days if I take my K200D for a spin I only use lithium AAs - they're very expensive but last for ages and they're the only ones that actually do what they're supposed to and don't fail when you weren't expecting them to.
My experience with the K100d and K100d Super does not mirror this. Nor even the k-50 I used to own for that matter. I routinely use(d) 4 2200 ma/hr energizer nimh aa batteries without any problems. I have kept lithium aa batteries as a backup and agree they are excellent as well. I often convert lenses to screw drive and do so with the k100d using aa nimh batteries. No failed rom reads or writes to date.