Just following up on my original post on 15/6/13. I have since sought advice on the Pentax Forum and the general consensus was that "Chuck" the lithium AA batteries and get a set of 'Sanyo Eneloops', So I recharged a set of AA Energisers I had from my K100D - Works perfectly!!! now I've bought a couple of sets of Eneloops, and I'll keep the lithium for my flash!!