I assume you are talking about a situation where your
ecig doesn't work, the charger doesn't respond to the battery, and other
batteries make the light turn red (charging)?
If you have access to another charger, try it on a second one. Do you have more than one battery? Does the other battery charge?
Or, are you talking about no vapor, but the light on the
ecig (if it has one) comes on? In that case, you might just have a flooded atty that is keeping the atty coil from getting hot enough to produce vapor.