Immediate battery level drop from more than half- charged to empty
I've had this two times on two consecutive days now, with similar usage situations (short phonecalls, a couple of messages and light net surfing prior to incident): the battery has been discharged from full-ish to just under the 70%- mark through normal use, when suddenly the charge drops to 4 % (yesterday 65->4, today 69->4). The first time I just did a reboot to check if the battery level returned to normal (it didn't), and plugged the phone to the charger and left it there. On todays sudden drain at first I did the same, but then decided to unplug the charger and do a reboot. The charge level rose immediately from 25% to 76% after it. I also noticed that the charging seemed quite quick before the reboot, but it dropped to a normal rate after it.
-I checked the Notifications just before both incidences; Twitter, Gmail and FB sync on
-No Developer mode activated, no OpenRepos
-Apps running ATT: Meecast, Messages, Lighthouse, Phone, Jolla Store
-This might be irrelevant, but during these two days in question I had a couple of warnings about the unit overheating, and being in need of a reboot. The phone temperature seemed normal to me, and Lighthouse clocked CPU temps between 38 and 41 Celsius...
So, does this seem like a software issue, or a problem with the battery?
Edit: added tag "temperature"
Update 12.1. 2015: Closed this, as the issue has apparently been fixed, or was just minor glitch. Still no actual answer to the question, but judging by the lack of votes and comments hasn't happened that often lately... Also retagged the question (added "bug").
Update 13.1. 2015: Reopened the question, as it seems that others have had this issue quite recently after all. Sorry for going back and forth with this :)
Here is an older post by @Refiineri, where the same issues are mentioned (somehow I missed the question while doing my research). Should I close my question as a duplicate, or keep it open as the emphasis in Refiineri's question is on the overheating, and mine is on the immediate level drop of the battery?
Kayakist ( 2014-04-27 18:46:41 +0200 )editI have had same level drops, and reboots. Few times i heard also loud BEEP when it went and rebooted.
tontze ( 2014-05-06 15:44:25 +0200 )editI just had this happen to me twise. First time from 73% to 4% and the second time from 45% to 2%. Both times I shutdown removed the battery and reseated it and the values were back up.
LinuxSam ( 2014-07-11 21:11:09 +0200 )editI've had this happen to me a few times as well. From ~50-25% to 0%-> reboot.
A few times my Jolla showed the charger icon full screen after shutting itself down.
alcalinebattery ( 2015-01-12 16:53:05 +0200 )editHas happened to me couple of times now with the latest software. Today my battery level was 46%, but suddenly Jolla just shutdown. After I turned it back on, Jolla said 4% and shutdown again. From that point on I was not able to boot the phone anymore (Didn't remove battery, had backup-phone with me, thanks to Sonera + Double-SIM). Moment ago I plugged it in the charger, and the phone started up by itself. Now it shows me 55% of battery.
mikma ( 2015-01-14 18:12:36 +0200 )edit