about your android os battery drain problem i can say this is normal for gb. when i was on juwe i rename the 3files and no any battery drain problem occur. my battery can stand for 2 day. about the comparison of ip4 and sgs, i had been using ip4 before and honestly ip4 doesnt really drain much battery in standby ,but once games on, battery drain fast too. 800mhz vs 1000mhz is not fair. is like comparing a kancil with myvi. of cause myvi drain more petrol. now u wanna drive a myvi or kancil? for me i have better car of cause i must have the money to pay for petrol.
car= phone
petrol=battery