My battery is suffering a little, but I think it is just a bug with the IO. I've been running this fix for a few days, installed from the market and yesterday the battery did pretty good. Today I unplugged at 8 am worked all day and did not use the phone at all, at 5 pm I was at 72%. From what I have read on smart phones they are battery killers. Instead of constant worry over battery usage I found a $10 package on E-Bay that includes 2 generic batteries for Samsung Captivates and a charger. I will just carry a few spares just in case. I'd rather sacrifice battery life to get rid of the lag. This is my second Cap and my first had improved battery after 2 weeks of use and "break in", I've had this phone for 1 1/2 weeks so it may improve in the next few days.
The battery wasn't great to start so I don't think it is the Lag fix at all.
T Mobile Samsung Galaxy Note II, stock ROM and Kernal
HTC Sensation 4G, Debranded, S-Off, Viper v1.3.5, XxXPachaXxX Kernel v2, 4Ext Touch Recovery
Not in use currently
Samsung Nexus S; sold
Samsung Captivate; sold