Sorry for the psudo-necro, but I only made it thru page 35 before I gave up, so this is directed at those of you who have been following since the beginning.
I have the 2600mha extended batt, has amazing capacity when it works, however, I find my phone just shutting itself off for no reason 2-3 times a day. Battery still shows 70-80% before and after it dies, and I have to pull the battery to get it to come back on. Anyone reported/seen a similar problem? Works fine with the stock battery, and the extended battery seems to have no capacity issues, just likes to randomly kill my phone.
EDIT: Just looked closely and noticed that the contacts on my battery are slightly recessed into the battery vs. the stock one which has the contacts flush with the surface. Is the recess normal or is that my problem?