Report on Mugen for day 1: At the end of the day, I still had an 88% charge left in my battery. I made a few short calls today, surfed the internet for about an hour, watched an episode of Family Guy, constant weather checks throughout the day, and automatic pull email on 3 accounts every 45 minutes. So far, I am very impressed with the quality of this battery, and I think it was worth the price.