Battery life--at least when the 9550 is "idle" over nite--seems improved over straight .428.
With straight .428, sitting overnite receiving whatever emails and updating BerryWeather hourly, would lose about 1.7% per hour per MeterBerry. .436 hybrid lost .7% per hour for 11 hours overnite past.
I don't have any sense with regard to battery life during daytime usage--calls, browsing, outgoing texts and email, etc.--but unless controlled and metered this would be very difficult for me to gauge as my usage patterns vary considerably from day to day.











