My lenovo ideapad 100s not charging what do I do?

Whenever I plug my Lenovo ideapad in it doesn't charge can someone please tell me what I should do

Get a new battery

Have you tried changing the battery and checking the lead plug? Or you could need a new lead. Or the electrics are completely gone and you need a technician.

Could be faulty battery, faulty charger, or faulty laptop.
Unless you have a Digital voltmeter to check the voltage at the charging tip take it to a tech

You should go to the Lenovo website and look for their FAQ page.