I purchased my light a little over a year ago. After about four months the light went out. I called novatac and they told me to clean the light with alcohol wipes and I did. It made the light a lot better. I now clean the light once a month. In the last two months I have started having issues with battery life. I have been using the same batch of batteries, have been cleaning it every month. It seems as if battery life is getting lower and cleaning isn't helping anymore.