Battery voltage as indicator of charge level

Is no-load voltage a reliable indicator of charge condition ? Are there
universal voltage levels for a particular type of cell (e.g. NiCd,
NiMH, Li-ion, lead-acid, etc.) that can be taken to indicate
full-charge and full-discharge conditions ?

There are gadzillion articles that discuss the general characteristics
of various types of rechargeable cells, but I have not found any that
specifically says that an X-type cell reaches Y Volts at full charge,
and should not be discharged below Z Volts.

Is it at all possible to specify voltage levels this way ? Temperature
and internal resistance (and therefore charge and discharge currents)
must play a part, but standard voltage levels under no-load,
no-charging at standard room temperature would be very helpful.

.

Relevant Pages

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