Feb. 2009. This page is one of top results for some search engines. I apologize I have not updated it regularly. Given the apparent interest in this subject I will try to catch up as soon as possible.
This is a far from comprehensive list of battery/cell weights as measured at home with non-professional weights.
When several cells were available, they were weighted together and the single cell figure calculated with a simple math operation.
Tables are grouped per battery size. Rechargable and not models are grouped together per size.
Use the search function of your browser to search for specific models/capacities. Producer website might provide technical details for their batteries.