Well seeings as i have the s500i and not the w580 and them being simular i can not be 100% certain how the battery lasts. But i listen to the mp3 player, am constantly texting and sliding the slider causing the lights to come on like a 3 year old with a new toy. I only charge the thing ever 3-4 days. So unless your one fo those junkies with the bluetooth headset that constantly has to be playing with the phone I'd say the battery life was good.