Easy. I think Battery life on S4 is really bad. Battery life on G2 is really good. my friends are told this is good on G2. and Good better than bad every time.
I was surprised that I liked it, too. I test all devices in real-word use for at least two weeks before making a judgment. How long did you use yours? Just got the S5, but haven’t started using it, yet. I did not like the LG Flex, which shared some of the attributes of the G2 - battery wasn’t enough to overcome the weirdness.