My s2 is running very hot and draining the battery very fast

Yes, you have a short somewhere. The wires should not get hot and smoke.

Many things can cause rapid battery drain. Ensure that you only have wifi enabled when you are using it, otherwise the phone will always be searching for wifi hot spots and this drains battery power. The same with bluetooth mode. If the phone is 4G capable, and it it turned on, it will search for 4G signals and use extra power. 4G uses much more power than 3G does, so if you don't need the extra speed, disable it when not needed. Lastly, if you are using your phone as a wifi hotspot for others, you are looking at definite battery drain there.

Could be the phone runs hot is seconds. Even with a full battery, the protection unit will shut the phone down, to prevent damage by overheating.
Try resetting it so it does not have to run lots of programs in the same tme.

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Yes, the internal voltage regulator can stick and drain your battery in no time at all.

First, before we proffer any solution, we need to know the problem.

Before the battery drains, does the phone gets hot in any way?

If your phone gets hot, then maybe the problem is from the phone board.

But if your phone does not gets hot before battery drains, then it is obvious that the fault is from your phone battery.

The solution therefore is for you to change your battery to an original one. The same problem might persist if you don't purchase a good battery, please take note.

I wish you the best.

Does the phone usually gets hot before the battery runs down?

Try changing the battery, maybe the battery cell is weak.

Let me know what happens after changing the battery, so that I might direct you further.

Take care.

Hi, If you solve engine idle speed fault this will stop warning lights.
Oil preasure falls when engine not at norm rpm because oil pump is not turning fast enough.
Put car on diagnostics to check for any fault codes

an internal circuit probably shorted. have it checked by a cellphone technician.

I have the same exact problem. I just now read a possible solution: try opening the battery compartment door and then closing it again to "trick" the camera into thinking it just got new batteries. There is definitely something wrong with the way the camera senses dead batteries.