For the Battery life, the Nokia E73 sports a 1500mAh lithium ion that is rated up to 13 hours for 2G or 6 hours for 3G of talk time and up to 16 days of stand by time.
For the vital function, the E73 has great speakerphone while we are still able to persist in talk even in a busy environment. Voices sound beautiful-well-rounded and clear. There's no in-ear feedback of your own voice, which can affect some people to yell while on the phone