Bigger Battery???? 2600mAh battery???? the S3 is 2100mAH battery. Which means if I buy an S4 Ill still have to charge it every 10-12 hours after moderate use. Your only looking at maybe 10% more battery in the S4 than the S3
A 2600mAh battery is 23.8% larger than a 2100mAh battery. Not sure where your math came from but a ~25% larger battery is a significant increase.