I filled an 8xAA battery carrier with 8 new alkaline batteries (eveready gold). Unit powers on fine. Turn ed it off. They sat like this for a couple of days. Then today I take the back cover off and add a label to it, put it back on. Unit still powers on and off just fine. Then an hour later I notice the back cover is WARM, which is not expected. I open up the case and 1 of the batteries is really warm. The others near it are warm, but not like the one. I pull all the batteries. I let them cool for awhile and measure them. The really warm one comes up 60% remaining (zts pulse load tester) and the other 7 come up 100% remaining. I've put 8 new batteries in the unit and they are all cold so far. I tried to test or see any sort of short in the batter holder, but it looks fine. Can an alkaline just go haywire like this? Outside of the battery holder it has returned to cold...