OK I'll see what happens with different brands thanks Anyway I don't have an AC power unit to test it... is it normal for an AA alkaline to have such a short life in rec mode? (battery meter starts decreasing at the first 30 sec. and then it keeps recording till 1 min. After that, it displays "Data Save", "Toc Edit" and "Low Batt". After "Low Batt" it shuts down) I bought it on ebay and I hope there's nothing wrong with the battery circuit or something like that as I was planning to record my sets through it.