A member at the other site has a done several of these. I posted the same pic that Conrad did and asked what he thought. He suggested the batts with the larger tabs with the holes. I think we can make a more secure solder joint with these so that is what I bought. I also bought ten of the battery holders. If these will easily fit I may use them instead to make battery replacement easier. I won't know until I open up one of the units. I bought ten because I was unsure on the Chinese Ebay site whether there were actually 5 to a pack or just 5 available. I bought two packs since they were only about $3.00. So I have extra, if anyone wants a set PM your address.
On the other site someone dremeled up the unit and epoxied in the holder. I am not sure I want to put a dremel on my unit.