Kangming rechargeable table lamp, just bought and charged a night after electricity, why the light is still not bright? Thank you?

Long press the touch bit, the light will gradually decrease, when released, the light brightness stops at the corresponding brightness of the release time, and does not change when the minimum brightness, on the contrary, it can be changed from weak brightness to strong brightness, and will no longer change after the maximum

Confirm that the use of the correct method, no doubt the light is definitely bad, the light is not bright and the charging time has nothing to do with the general charging 5 minutes can turn on the light, but the charging time is short, the discharge time is short.