Oh dear…
That does not sound good.
I expect that you will have to return it to the vendor.
If it got as hot as you said - it would be permanently damaged
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Very sorry. Thanks for the help. 
It is very sad news.
Sorry I have no better advice for you 
Over the last week there are 3 posts reporting Lem12 Pro stopped working completely. Symptoms are watch will no longer turn on, plus also when on charge that the watch gets very hot.
There is one on this topic lemfo lem12 pro won't turn on, and the two above from Alexcomrad and myself.
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Just curious @Alexcomrad
What are you referring to in the photo?
From your description of what happened to your watch (leaving on charge all night and getting overheated) I am just wondering what you meaning?
Have you fixed your problem by removing the battery and then connecting it again?
What has happened?
Thanks
Yes, it seems that there has been a few devices with bad chips (flash chip)
That’s why I said return them because there is not much to be done if you have these issues.
Hundreds of people don’t have any problems and so it seems more and more likely to be bad nand or similar
It’s not promising I ordered my third android watch (Kospet hope , Genesys and now Lem 12 pro if this one giving me problems too than its game over forever> Hopefully the others just got bad luck.
I think so to be honest.
Mine has been absolutely fine and I have had it for a long time.
Same for other people we know…
No problem.
But as I said, we have seen some flaky nand chips. So I suspect this is the problem to be honest.
The person wrote that he regretted not writing down the characteristics of the battery. Well, I’ve made up for lost time. This has nothing to do with my problem. In my opinion, everything is clear, and I have quoted him.
p.s. Crooked google translation. But I think my thoughts are clear.
No, I just opened the back cover and looked at the battery status. There was a concern that it could swell and destroy the watch case.
On my problem: I contacted the seller and he also said to send him a watch. But this is not possible now. We have holidays ahead, then they have holidays in China, the mail is already overloaded and the clock may simply not reach, or it may have been lost. I decided to try to contact local craftsmen. According to preliminary symptoms, it is similar to the failure of their battery charge controller.
I wouldnt worry . As others mine is 100% 
Hai, I’m from indonesia , can some one help me, my lemfo lem12 when I put sd card in, no signal appear, ? I have done everything to appears that signal
Hello! Maybe you meant sim card?
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good to hear , keep fingers crossed till i got it …
If you put your sim car in you need to reboot the watch . Then it should be fine
If he has got a SD card slot its a " limited edition model " we know nothing about 
To be honest, if you have disconnected the battery and then reconnected and still cannot charge - you should just use the cheapest postage option and return it.
Get tracking for the package and give the tracking number to Lemfo support…
It’s the only way.
Some tips for charging your watch without cooking it:
Turn watch OFF
Use only the cable that comes with the watch and only charge until you have reached 100% (you can check this by lightly pressing the power button once)
Do not leave your watch on charge for longer than needed.
If you have to leave the watch powered on - for some reason - make sure everything is disabled for communication.
WiFi, BT, Sim card all disabled.
Make sure that the screen is turned off and is staying off.
Again - only charge until it is full.
As I said though, the BEST way is to make sure the watch is powered OFF and don’t charge for longer than needed…!
Cheers
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Just ordered a LEM 12 Pro! Super excited! Any reccomendations for accesories I should buy or anything else I should know while I wait a few weeks for it to arrive?