Hello Stefonte, We are sorry to hear about the experience you have had with this product. Here are a few troubleshooting suggestions to check out. 1) When the battery is inserted, the light should begin flashing green to indicate the battery is charging. If this light is not igniting or is flashing red, this may indicate an issue, and we would be interested in hearing more about this. If the light simply goes solid red, try removing the battery and unplugging the charger for about 10 minutes and place them both indoors in a room temperature setting, as this might indicate the battery is at the incorrect temperature to be charged. 2) A poor connection can prevent the battery from charging. Ensure the battery is properly seated in the charger and that the contacts on both the charger and the battery are clean and free of debris. Sometimes this requires a firm to push into place to make sure that it has been properly seated. 3) If the battery works on the working side, but not the other side of the charger, the charger itself might be faulty. Consider using a different charger, if possible, to isolate the problem. If you have exhausted all troubleshooting steps and the problem persists, contact us through Live Chat on www.greenworkstools.com or call Greenworks Pro toll-free helpline 1-855-345-3934. So, our experts can discuss your experience; please have your unit, battery and charger with you along with the model and serial number to complete troubleshooting to ensure a quick resolution is provided.