A friend of mine sent me this cab a while back and it helped me improve the battery life of my TP and BF's Diamond. Do not know what the tweaks are, but the only thing I know is that it was work for me like a charm.
Try it for yourself and if you do not like it, since it is a cab file, you can just remove it
Sincerely,
Shin_Akuma26
PS: Let me know how it works for you guys and if I helped you somehow press the Thank You button
PS1: I also see that people are having trouble extracting the file from the rar, so I am adding the rar version for PPC. Once you have this is your phone I think it will be easier for all.