Are you satisfied with your phone's battery?

I have 2 smart phones - Cherry Mobile and Samsung SIII. Both phones have batteries that easily go low. For texting and calls, I still use my old Nokia since the charge lasts for several days while the smart phone’s charge lasts only for a day at the most. My wife said that the remedy is the portable charger which is also called power bank. When the phone’s battery goes down, connect it to the portable charger and life goes on.