The Sony Ericsson W200i runs on a Lithium Ion battery. Sony rates this phone as having a battery life of up to seven hours of talk time or three hundred hours on standby. This standard would vary based on personal usage and the age of the battery.
The Sony Ericsson W300i is a flip phone that was released in 2006. It has 20mb of internal memory, a screen display resolution of 128 by 160 pixels and battery life (talk time) of approximately 9 hours.