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HUH? 6.2 V? Seems a bit high to me, since AA batteries of the NIMH kind run at 1.2 V or so. 1.5 for fully charged, 0.9 and they are pretty empty. More importantly hard to know how long ago they were charged. I think the only real way to tell is to get either a smart charger or use a computer battery tester under a fixed load. The ZTS charger is great but it will not tell you real capacity.
Bill