Be interesting to know what other people are seeing for working battery capacity after firmware update, particularly folks who had frequent battery drains, overheating, etc., and did not exchange their devices. Also interesting to know what the average
SP2 user is getting as estimated usage hours on a full charge.
Many have said that you need to charge your battery to 100% and then discharge it below 10% before you start getting accurate reports of remaining charge. However, I never quite understood how that translated into what you should do because the preparation
protocol depends on the computer's display of remaining charge. So I won't take seriously my remaining charge estimates until I've charged for a long time, used the battery long enough to get told to shut down or else, and then fully charged again.
Others know much more about batteries than I do, but this is how I muddle through.
Yes, I'm one of those folks who has mentioned in the past that the most accurate battery capacity readings are likely to be obtained soon after a full discharge (< 10%) and a full subsequent recharge.
However, I think my point and question is about relative, not absolutely correct battery capacity charge readings immediately before and after the 1/18/14 firmware update. Prior to the update, my relative battery capacity readings were very consistent from
day to day. Others had wildly varying (relative) battery capacity readings. So my question, which I think is worthwhile, is what did the installation of the firmware do, relatively, to your battery capacity readings (as well as the % charge status readings,
which rely on a battery capacity/maximum voltage determination, anyway). And if one waits too long after the firmware update and gets a wildly disparate new battery capacity reading, you won't know whether that's courtesy of the firmware update or some other
new issue that's cropped up...... Since my Surface RT suffered occasional mysterious sudden discharges (well before I got my SP2), I've run "powercfg /batteryreport" every day for each Surface device and every so many weeks I have saved a dated copy in a
folder on. Battery Reports for each device on SkyDrive, e.g., 20140115 battery-report On-Off States.html for SP2 after 1/14/14 Patch Tuesday. Guess I don't really trust the discharge behaviors of my two Surface devices to behave normally all of the time.
But enjoy using both devices immensely, anyway.
EDIT: point of running Battery Report every day is to spy on behavior of my Surface devices when I am not using them. Are they waking up, etc., when they should be sleeping, hibernating, shutdown, or whatever. Not for battery capacity
estimate.