Battery life is much better than the one of the S. I'm charging the P every second day (vs. every day on the S) with about the same usage pattern (3g on, display set to bright, 15 minutes pull on mail accounts, FB and weather widget, background data on, 2-3 hours of music, 15 mins. calls, 10 SMS, 30 min. web browsing, 8-10 hours connected to WiFi).