Camera - What battery do a use for a Polaroid IEX29? And where can I find one?

I have been reading reviews on amazon.com and there are a lot of complaints regarding the battery. I suggest you get a Kodak DX-7440. I have one and it is wonderful. Batteries and attachments are easy to find.
www.amazon.com/Kodak-Easyshare-DX7440-Digital-4xOptical/dp/B00022AH6I

Here is the site that convinced me to get that model:
raydobbins.com/photosetup.htm