Correct, the green labeling is perfectly legit and it signifies that the battery itself is "Intrinsically Safe." This means that it was specially designed for use in hazardous environments where other electronics could not be used (for example, in a gas leak where it would be possible for a normal radio to cause a spark that could cause an explosion of the gas in the air). Like RFRadioConsult said it's not safe unless you use the battery along with an Intrinsically Safe radio. However, the battery will work just fine in a normal, non-IS radio.