Bizarre new twist for me with battery status reporting. Despite a failed firmware update on 12/10/13, after the Dylan Tullberg repair that I did, battery charge status, battery capacity, all seemed to be behaving normally up to 1/29/14. Then I decided
to do a full discharge/full recharge of my battery.
Decided to switch to the built-in Balanced Power Plan rather than my own customized power plan to drain the battery (not have to change any of my own plan settings back and forth). Decided to follow Phra Mick Ratanapanyo's advice to put the Critical Battery
Level Action at SLEEP, thinking I'd just wake up the device and keep draining past 5% charge. Seemed to recollect having the past experience that the built-in Balanced Power Plan does not take kindly to customization as when I hit 5%, my device just hibernated
or shutdown anyway rather than going to sleep.
No matter. Let's just start recharging. Plugged in Surface RT power adapter, approved by Microsoft as it give slower charging but takes longer, less battery heating, yada yada. Battery status indicator started showing charging animation and soon stopped.
Many minutes later still at 5%. Hookay! Maybe I should be using the official SP2 adapter. Same deal with charging animation and 40 minutes later still at 5% battery charge.
Hmmm! Sound like the old battery status indicator problem from this forum (which I never had before). Decided I would try treating my problem as if I had just installed a new battery so I uninstalled the MicrosoftACPI-Compliant Control Method Battery in
Device Manager and rebooted. No luck.
Time for the old Volume Up Button/Power Button trick (power off, hold both buttons together > 15 sec, wait > 5 sec, reboot). That worked and suddenly my battery showed 42% charge. Recharging continued to 100%, with ostensible wear levels of 1% to 3% showing
through CPUID during recharge. Upon completion, wear level pegged at 1% with Full Charge Capacity varying between 41,699 and 41,906 mWh (design is 42,002 mWh). Don't know if fact my house is very cold (60 deg F) is lowering battery voltage/design capacity
estimates. Have been through 18 charge cycles.
Another familiar irritation reared its head. Every time I closed my Type 2 cover, my SP2 hibernated/shutdown instead of sleeping. If I used the Charms Settings Power Button to sleep before closing the cover no problem. Had that happen only very sporadically
after the failed 12/10/13 firmware update but last night after the full discharge and the battery status problem, the cover close shutdown happened dependably every time. Today after being shutdown all night and rebooting, the device is back to sleeping when
the Type 2 cover is closed. Go Figure......
Moral of story: Anyone who thinks that their SP2 is behaving very normally might want to keep instructions for the Volume Up Button/Power Button battery status indicator reset handy when they go to fully discharge and recharge their
SP2's.. And if you decided to discharge to 0% battery capacity per Phra Mick Ratanapanyo's Sleep suggestion for Critical Battery Level Action, probably best to change the setting in your own custom Power Plan than relying on a built-in Power Plan.