Many led rechargeable table lamps on the market are simple, no battery charging monitoring, control functions. Charging instructions are not perfect, this is a short-lived junk product, the price is not high, the internal circuit is simple, low cost, can only be used as a toy.
A good rechargeable table lamp should have battery charging monitoring and control functions. Naturally, there should be a charging degree indicator light, or change the color of the indicator light with the change of battery voltage, or change the number of lights to indicate the profit or loss of charging, such a lamp battery often has a longer life, it will increase the cost, and the price will be higher.
It's not charged! Or if the charging cable is broken.