I had the same issue with my 570IS last year. Fresh rechargeables didn't last long. I read on this forum that some of the cameras had poor battery contact on the hinged battery compartment door. The suggested fix was to very carefully deflect those contacts outward. I tried this and have not had a single issue with batteries since. Keep in mind that the deflection should be so minor that you really can't perceive any change in the position of the contacts. Of course, proceed at your own risk, but it worked for me.