It is not illegal to use it yourself, but it is illegal to sell it as merchandise. It is not illegal for individuals to assemble lithium batteries for their own research, experiments and uses if they are sold as merchandise, it is illegal. The sale of privately assembled lithium batteries is an illegal act that violates industrial and commercial administrative regulations. If the circumstances are serious, this may constitute an offense of illegal trading under criminal law. The person will be sentenced to a fixed term of imprisonment. more than five years or criminal detention, and will also or only be fined at least once but not more than five times the illegal income.
Strictly speaking, a business license is required.
But it depends on whether you want to grow your business and whether your current scale is retail or high volume. IfThis is a large volume, it is recommended to apply for a commercial license, otherwise. you will have to pay for an accident. He is fully responsible and will be seized and held legally responsible. If it's just a few retail sales, it's not necessary at this time.