Try Jeffrey-SpeedFrey 3.0, just released today.
http://forum.xda-developers.com/showthread.php?t=1213339
The kernel that aimed to have the best battery life, you do the judge. 

1. Make sure you have your phone rooted. Normal and easy way is via CF root (Check xda forum for CF series).
2. Backup!
3. Place the VR files into your sd on your phone.
4. Off phone
5. Volume up, home button and power all at same time - this will go into CWM recovery mode
6. If you have back up, choose back up.
7. Once done, select - clear data, clear cache and go to advance, select clear dalvik
8. Now, select Install update from Zip or something like that.
9. Scroll to the VR zip and select it.
10. Wait for boot up. Will take awhile.
11. If it stuck at loading / bootloop, off phone, and wipe and reflash back via CWM.

There you go.

Good battery life:
Ninpo and SpeedMod. SpeedFrey, haven try yet.

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Added on August 22, 2011, 12:29 am
Yes, should be fine.