Also a reason Apple has not put the COMPLETE slamdown on Samsung- Apple needs them thar' displays
The SG2 has battery issues when using the full speed of the device, so anything higher than 1ghz with non samoled display would be a tad harsh for battery life. The main reason the the Charge lasts a little longer than the other 4G devices is the display (well, that and the slow a$$ file system). The Charge certainly is not lasting longer, due to better 4G radio, since the current generation across the board is a battery sucking mess.