Strange SP2 Full charge Capacity... checked by pwercfg

[manfromwest]

Since I failed to install Dec 2013 update, My sp2 works only for around 3 hours.
100% charge and count says 2 hour XXmin left. And 100% for more than 2 Hr...

Now I found reason why... Not the sollution

This is the powercfg screen capture right after (volume +key with power button) boot
Check Full Charge Capacity



This is the next charging captrue



Everytime I restart Full charge capacity is chaging....

It seems 40,404mWh is normal charging cpacity.
but most of time Full charge capacity is set to 20,000 ~ 30,000

Is this Firmware problem? or defect SP2...
I am tired to ask MS supprt they know nothing about serious thing.

 

[the_new_normal]

Post 841 on this thread, top of page 86 has a possible solution you might like to try:

answers.microsoft.com/en-us/surface/forum/surfpro2-surfupdate/system-firmware-update-121013-fails-to-install/b2163f4b-9019-4508-a931-45c44fbbeb9c?page=85

QUOTE:
I had a tech help me yesterday to reset my battery. My battery life seems to be better.
No guarantees but worth a try:



Make sure to Plug your surface in-must be running on ac power

Open device manager and locate batteries

Click on Microsoft ACPI-compliant control method battery

Right click and select uninstall

restart the surface

This is supposed to mimic installation of a new battery to the surface firmware

 

[drolem]

This is the powercfg screen capture right after (volume +key with power button)

Hard reset resets everything, and not always to a good value. Stop using it unless you really have to, or do it when the battery is fully charged.

 

[manfromwest]

let me try... thanks!!