I'm getting ready to release a new version of RC Calculators this weekend. It has four types of battery chemistry supported. There are five levels of voltage that are calculated. I have looked at a lot of sources of information and the screens below show the best values that I have been able to come up with. The Nominal voltages are pretty solid. I don't see much variation in those. The Peak voltages are also pretty consistent from Wikipedia to other sources. The others are somewhat subjective with some sources being more conservative.

If you think any are wrong, please post or message me privately.