Are lipo micro battery chargers safe? Do they charge too fast?

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I really like these green chargers from Banggood but I was warned that they might not be safe. So, I had to test it out for myself. Based on my results, will you keep using them?
Products used in the video:
Clamp Meter:
Extra 45C E010 Batteries:
New E010S 240 mAh batteries:
Eachine E010S Camera Drone:
Make sure you pick the receiver that matches your radio
and extra batteries
Extra 45C E010 Batteries:
2warrior Go-4 Dual Charger:
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