First, I apologize for digging up the grave. Then, I suggest you open it up and check the charging indicator lights. My device also has a light that doesn't turn off even when fully charged, and the color remains unchanged. When I checked with a USB current meter, the current dropped to 10mA (which clearly indicates that it was fully charged and stopped). When I opened it up, I was very surprised to find that both the "charging" and "full" indicator lights were red, but the light didn't change color.😇Finally, I used some black glue to cover the indicator light that was lit up when fully charged, so it would no longer turn on.😇If the voltage drops quickly, try turning it on and measuring the voltage directly. If the voltage hasn't dropped much, turn it on again and measure it. If it has dropped significantly, then the battery needs to be replaced. A voltage of 4.15V during charging is normal. It seems that the charging IC is configured this way. My device only has one button switch; it won't automatically turn on when plugged in while turned off. If you completely disconnect the power (remove the battery), it will turn on automatically for the first time, but you can press and hold the button to turn it off.
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