[Galaxy S II Q&A, Help & Troubleshooting] dany123i:
**Please note, i have already searched this forum and found some similar threads as: charging paused, voltage too high, SGS2 charged all the time, Charging suspended. Voltage too high and Phone keeps charging after plugin off the charger but none of them had exactly my problems so i'll try to describe mine better here.**

Some background and possible cause first

I have been using Omega ROM @ 2.3.5 (yes it's old, but it doesn't matter) for more than 6 months now and i haven't had any problems with it, but a few weeks ago i decided to upgrade to ICS so i did a full backup with CWM and also backed up sdcard to pc. Did a full wipe, formatted sdcard and installed the AOKP ICS, hated the camera app, wiped everything again, installed normal ICS, it was looking ok but i needed my usual apps the second day so i decided to go back to my 2.3.5, restored backup, restored sdcard. I don't remember exactly if i had the phone plugged in before installing ICS or after going back to 2.3.5 but when i disconnected it, it showed that it was still connected and charging...

Please note that everything was ok before updating to ICS (which is one reason why i believe it's software related), i used the original mains charger / micro usb cables at home and i also used a cheap car charger but long before this started happening, and the last time i used the car charger was 2+ moths ago.

The thing is, i don't care if it things it's charging all the time, my problem is that when charging it keeps the cpu active, and even when setting it to 100 MHz the battery only lasts about 5-10 hours with low-moderate usage (see the screenshots of cpu spy, it is clear that the phone does not enter

deep sleep

while it "thinks" it's charging).

Symptoms

At first, it kept showing it was charging all the time,

sometimes

when reaching ~10% it went back to normal (YES, normal aka reporting as no plugged in and no charging (=discharging), so i don't think there's any short-circuit/something wrong with the usb connector (which i tried to clean up, as suggested, but the problem is still there) :

---

---

Then (and currently) after 1-2 mins of disconnecting charger/usb cable it stops the charging animation but *#*#4636#*#* and some battery app stats show that it's still plugged in but discharging (also it reports over-voltage, which is weird because when it is still charging it shows health:Good).

Also, if it goes back to normal (aka not charging and not plugged) and i connect the mains charger then disconnect and connect usb cable it will still see/think that the mains charger is still connected and i can't connect the mass storage to pc (the dialog never shows, because it still thinks it's connected to mains) and vice-versa, but the battery is charged no matter where it thinks it's connected.

Now the weird part, and the reason why i don't think it's hardware (aka usb pin short circuit or anything else stated in the other threads)

if i remove the battery for long enough

(something around 10-12 hours) over night, in the morning the phone would be completely normal (i was able to do this 2 times so far and both times the phone clock&date were resetted which makes me think the "connected" state is stored somewhere in a temporary memory powered by a small battery which keeps track of the time and alarms?; also if the time isn't resetted, the phone would still think it's connected (yes, even after removing the battery for some 8+ hours)), but the problem reappears if i connect charger/usb cable (something to note here, if i connect the cable and it's not plugged in, the problem doesn't start so this excludes micro usb connector problem).

---

And also, as in some other posts, while the phone is shut down it keeps showing the charging animation along with some warning high temperature? triangle:

Here is a screenshot of Battery monitor widget showing some weird voltage spikes, is it possible to reach 5V?

The wakelocks (from Better battery stats app):

Also, something that i've wondered if all S2s do, when i remove the battery and plug in the charger (of any kind) the phone shows a no battery image:

One other thing that might worth mentioning is that sometimes, just a few seconds after i lock the phone, the screen just lights up for a second then turns back off for a few times (2-5 times), but this might be just an app problem and it's not really currently bothering me.

Also i just noticed when posting the screenshots that the battery is always pretty hot, is 32 - 37*C too hot or is it ok?

Conclusion

Well, it's been 3 weeks since this problem has started because i updated to ICS and i still didn't fix it. My plan is to order an Usb jig from ebay, get everything back to stock and send it to warranty, but this will take some 2-3 weeks until i get the jig and another 2-3 until the guys fix/replace it so i'm posting here hoping for some suggestions from more experienced members or people that also had this problem, because i ran out of ideas to try here.