When I bought my Bionic (at a retail VZW store) I inquired about an extended battery, and was pleased to find that they had one in-stock, and it was 1/2 off with the purchase of a Bionic (only $25.00) I fully charged the extended battery ( with phone off ) the first night with my new phone. I turned it on about 9am, and it was almost dead by 7pm. I only used my phone from average to minimal that day. It was however automatically jumping from 3g to 4g throughout the day. Has any one else used the extended battery, and how well is it working for you? After a few days of using the extended, I am now going to switch to the standard and see how it goes.