I’ll give firmware reset a go whilst I still have charge (24%)
But I’ve never done it before, is there a link with some info?
Current firmware…
Just go in settings/ System and reset options
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Sigh… wont do a reset if battery is less than 25%
Now down to 18%…
Please power off your watch now. Flashing the firmware will still work, but we need some power left. But- not sure if flashing will solve your problem. Just a last try…
I think it’s a hardware problem.
Watch has been powered off for last 2 hours - although charge was down to 12%.
How do I flash the firmware?
Edit: If it is hardware, will flashing the firmware help?
If it’s an Hardware problem, flashing won’t help. But otherwise it will help.
Here is a flashing tutorial:
-LEM12 Pro A10 Official Support
I’ll send you the link to the right firmware later.
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I don’t have the firmware at the moment. Please be patient, you’ll get a link soon.
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I just hope I have enough charge…
Can an incomplete firmware flash brick the watch?
And If bricked, will Banggood still replace the watch under warranty?
FYI: I have reported the problem to Banggood. Apparently I should get a response within 24 hours.
You will get the right firmware and it won’t brick your watch. And yes, there is enough power left.
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Here is the firmware:
-https://drive.google.com/file/d/1-sQubTkr52MYZEzhNvEgJHK07uAQdZoi/view?usp=drivesdk
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Thanks G1NT0N1C.
I’m in email correspondence with Banggood. I’ve sent you a DM with the details.
.
When you connect to a computer can you transfer files? If not then it is likely a bad cable. If you can transfer a file then it would seem to be a hardware problem in the watch.
From my experience, I’d say this is 99.9% a hardware failure with the switching regulator used for charging.
The only way to solve it is replace the watch with a new one, or replace the broken chip (almost impossible to do).
Did you use any cable other than the supplied one? The cable from the LEM12 will plug into this watch but it has inverted polarity, which can damage it…
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Well I would say 99%. And 1% for the cable … Personally, I would check the cable. But unfortunately he has no measuring device. 
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If you are in the U.S. you can get a multimeter from Walmart for less than $5 online with free shipping. See my last couple posts in the Prime 2 thread around #737 and #734 for a link to that inexpensive meter. Also a picture I put up shows what the polarity should and which pins should show about 5 volts. That should pin down (no pun intended) whether the cable is bad or the watch regulator chip as iscle mentioned.
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Update:
The battery charge is now under 10% and I’m keeping the watch powered off for now and NOT connected to the charger. The watch appears to lose charge faster when connected to the charger. It’s nuts.
I’m in email correspondence with Banggood and it seems they will be sending me a replacement charger cable - hopefully soon.
Guys I plan to pop into an electrical store today to get the cable tested.
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Thanks for keeping us posted 
Good luck
Ok just back from an electrical repair store…
Cable seems fine - voltage is just over 5v
We put the watch on charge again - dropped from 9% to 7%
Repair technician concluded that the problem is with the watch, not the cable.
Waiting for a replacement charger cable from Banggood is a therefore probably a waste of time…
If you use any other cable than the one provided - you can seriously damage your watch because the polarity is different.
Please power off the watch.
Use the supplied cable and connect to a PC or similar and hope that you have not broken the power circuit.
That is why there is a big warning about it in the first post of the official support thread…
Just so you know - you have been checking the magnets in your photo.
They have nothing to do with charging.
If you have already used different cables - I suspect you will have to return the watch because the charging circuit will be toasted.
Just send it back if this is the case.
In fact - you should return it anyway.
Firmware flashing will make no difference - it’s hardware that is affected.