Got my Yooboa battery charged yesterday afternoon and popped it in the phone at 4pm. Used the phone for a couple of hours, checking email, a little web browsing, etc. As you can see from the JuicePlotter chart it took 3 hours of use to draw it down to 90% and this is only on the first charge.
Didn't charge the phone overnight and with some downloads that are scheduled to occur during the night I still was at 80% 14 hours later. I'll see how well it holds up today with a full day's activities.
Very happy with the fit and finish of the Yooboa phone back. The phone with the new battery and back still fits in my BestBuy Rocketfish universal belt case.
I think I'm going to be loving my phone's new capacity! Cross my fingers that it holds up for the next day or so.