I get questions all the time regarding "is this voltage right?" Well, it depends.
Surface Charge. Just after charging the voltage can be a few tenths higher, sort of like how a lieden jar stores static, although the mechanism is different. Put a few amps on them for an hour before reading at no-load.
Under Load or While Charging. Both of these affect the voltage due to internal resistance effects. Although in theory these can be corrected for, in practice you will miss by a mile. Always test while resting.