How to charge safely: 1. Connect the wall charger to AC socket first, and the led of the charger will light green. 2. Then connect the charger with battery. Will not charge? Please contact seller immediately to replace a new charger. To provide power for the Positive Grid Spark Amp. Output: DC1 (5521): 29.4-21V/3A DC2 (4017): 19.5V/3A USB-A: 5V/2.4A 12W Max. USB-C: 5V/3A 9V/3A 12V/3A 12V/3A 20V/3A 60W Max. Compatible with most Laptops, Notebooks, LED strip light products, CCTV Camera, LED Panel, Modem, Speak, Car DVR, Router etc. We Provide 12 Kinds of Connector for Most of the Popular Laptops, please Make Sure the Connector Fits for Your Laptop before purchasing.