Originally Posted by Goof

They might not be good, There's that white little plug. Plug that into the charger and see what they read. If they don't read anything it' dead . You want them to be above 3 V. Per cell You could storage charge them and then check them every 3 months when you get new ones.
YouTube can help u ... watch Storage Charging your lipos

Originally Posted by Thamoss

There's a possibility they might not be in optimal condition. Look for a small white plug; connect it to the charger and check the readings. If there's no response, it might be dead. Ideally, you want each cell to be above 3 volts. Consider storage charging them and periodically checking every three months, especially when acquiring new ones.