Welcome to the YOC. Firstly, you will probably get more responses if you introduce yourself in the new members section. We get a lot of one hit wonders here with quick what's wrong with my bike questions who then can't be bothered to even say cheers! What bike is it? How old is the battery? Even if it has been charged, if it is a knackered battery, it will still be knackered! As Kev said, check the terminals of the battery first, then check any earthing wires for good connection. If there are no loose wires, get the battery checked as this is likely to be the problem. Did you fit the new HT leads?