yup I've been using the extended battery or a few months now. But I do not use the Android app that comes with the battery to mange the power profiles.
Normally after reaching the Orange bar or red bar my phone suddenly goes to a battery sign with a red (x) in the middle and then if you give a reboot it boots back on with 80% of the battery juice again as if you released a reserve.
But frankly you can not trust the battery gauge at all with the extended battery as I have had amazing uptime with the extended battery even having clumsy battery juice levels. I would say my Streak will run at full use (4 hours calling, running skype all day, facebook messaging and some youtube) for abt 15 - 20 hours on extended battery but it is always a practice of mine to wipe the battery memory time to time from boot menu.
Happy New year 2012 GUYz!!!
Hope to see the ICS rolling out on My Streak 5...
Edited by kalanaya, 31 December 2011 - 09:45 AM.