Draeger X AM 2500 LEL NIMH battery. Dräger’s X-am® 2500 accurately detects O2, CO, NO2, SO2 and H2S. It is the only 1–4 gas monitor needed in industrial and refinery applications. The X-am® 2500 combines reliable sensor technology with long battery life and intuitive operation in an instrument that represents safety with long battery life and intuitive operation in an instrument that represents safety.